| 詞或詞組 | 中文 | 英文解釋中文解釋 |
|---|---|---|
| A-basis | A-基礎(chǔ) |
Mechanical property value above which at least 99% of the population of values is expected to fall, with a confidence of 95%. Also called A-allowable. 機(jī)械性能值超過該值時(shí)，至少99%的值預(yù)計(jì)會(huì)下降，置信度為95%。也被稱為A-容許。 |
| Abelian group | 阿貝爾群 |
Property of a group of elements associated with a binary operation. In an Abelian group, the group elements commute under the binary operation. If a and b are any two group elements and if the (+) sign denotes the binary operation, then, for an Abelian group, 與二元運(yùn)算相關(guān)的一組元素的屬性。在阿貝爾群中，群元素在二元運(yùn)算下交換。如果a和b是任意兩個(gè)群元素并且（+）符號表示二元運(yùn)算 |
| Ablation cooling | 燒蝕冷卻 |
The cooling of a surface exposed to very high external gas temperature which causes the surface material to sublime, melt or decompose. The chemical process absorbs heat while the mass flow of material away from the surface blocks the heat flux from the hot gas. 冷卻暴露于非常高的外部氣體溫度的表面，導(dǎo)致表面材料升華、熔化或分解。化學(xué)過程吸收熱量，而遠(yuǎn)離表面的物質(zhì)的質(zhì)量流阻擋了來自熱氣體的熱通量。 |
| Ablative materials | 燒蝕材料 |
Materials, especially coating materials, designed to provide thermal protection to a body in a fluid stream through the loss of mass. 材料，尤其是涂層材料，旨在通過質(zhì)量損失為流體流中的物體提供熱保護(hù)。 |
| Abradant | 研磨劑 |
The differently sized grits of hard materials such as emery employed for grinding, polishing, etc. The abrasive grade is determined by the grit size (grit number) originally related to the hole sizes in wire sieves. 用于研磨、拋光等的硬質(zhì)材料（例如金剛砂）的不同尺寸粒度。磨料等級由最初與金屬絲篩孔尺寸相關(guān)的粒度（粒度數(shù)）決定。 |
| Abrasion | 磨損 |
The removal of surface material by the scratching action of hard particles, either deliberately (abrasive papers, abrasive cleaning, abrasive machining) or as a consequence of operation (wear). 通過硬質(zhì)顆粒的刮擦作用去除表面材料，可以是故意的（砂紙、研磨清潔、研磨加工），也可以是操作的結(jié)果（磨損）。 |
| Abrasive wear | 磨料磨損 |
The removal or displacement of material from a surface when hard particles slide or roll across the surface under pressure. The particles may be loose or may be part of another surface in contact with the surface being worn. Contrast with adhesive wear. 當(dāng)硬質(zhì)顆粒在壓力下在表面上滑動(dòng)或滾動(dòng)時(shí)，材料從表面上的去除或位移。顆?？赡苁撬缮⒌幕蚩赡苁桥c被磨損表面接觸的另一個(gè)表面的一部分。與粘著磨損形成對比。 |
| Abrasivity | 磨蝕性 |
The extent to which a surface, particle, or collection of particles will tend to cause abrasive wear when forced against a solid surface under relative motion and under prescribed conditions. 在相對運(yùn)動(dòng)和規(guī)定條件下，一個(gè)表面、顆?；蝾w粒集合在被迫抵靠固體表面時(shí)趨向于引起磨粒磨損的程度。 |
| ABS polymer | ABS聚合物 |
A class of thermoplastic co-polymer consisting of the three monomers acrylonitrile, butadiene and styrene that has improved properties (particularly toughness) over the individual constituents. 一類由丙烯腈、丁二烯和苯乙烯三種單體組成的熱塑性共聚物，其性能（特別是韌性）優(yōu)于單個(gè)成分。 |
| Absolute expansion | 絕對擴(kuò)張 |
The true volumetric expansion of a liquid with temperature, after account is taken of any expansion of the container in which it is held. 考慮到容納液體的容器的任何膨脹后，液體隨溫度的真實(shí)體積膨脹。 |
| Absolute humidity | 絕對濕度 |
The weight of water vapor in a gadwater vapor mixture per unit volume of space occupied, expressed, for example, in grains or pounds per cubic foot. 單位體積空間占用的水蒸氣混合物中水蒸氣的重量，例如，以谷物或磅/立方英尺表示。 |
| Absolute manometer | 絕對壓力計(jì) |
A manometer that measures absolute pressure, i.e. pressure measured relative to a perfect vacuum. Absolute pressure cannot be negative. 測量絕對壓力的壓力計(jì)，即相對于完美真空測量的壓力。絕對壓力不能為負(fù)。 |
| Absolute pressure | 絕對壓力 |
1. The pressure measured relative to zero pressure (vacuum). 2. Gage pressure plus barometric pressure in the same units. 1.相對于零壓力（真空）測量的壓力。2.表壓加上大氣壓力的單位相同。 |
| Absolute rating | 絕對標(biāo)稱值 |
A theoretical size designation which is an estimation of the largest particle, by length, that can pass through a filter with a specific 一個(gè)理論尺寸名稱，它是按長度估算的最大顆粒，它可以通過具有特定過濾器的過濾器 |
| Absolute specific gravity | 絕對比重 |
The ratio of the weight of any volume of a substance to the weight of an equal volume of a reference substance at the same temperature, often water at 4°C, both measured in a vacuum to avoid any effect of buoyancy. 在相同溫度下，任何體積的物質(zhì)的重量與等體積的參考物質(zhì)的重量之比，通常是4°C的水，兩者都是在真空中測量的，以避免任何浮力的影響。 |
| Absolute stability | 絕對穩(wěn)定 |
Condtion of a linear system in which there exists a limiting value of the open-loop gain such that the system is stable for all lower values of that gain, and unstable for all higher values. 線性系統(tǒng)的條件，其中存在開環(huán)增益的限制值，使得系統(tǒng)對于該增益的所有較低值都是穩(wěn)定的，而對于所有較高值來說都是不穩(wěn)定的。 |
| Absolute temperature (Unit K) | 絕對溫度（單位K） |
A temperature T measured relative to absolute zero, 0 K or ?273.15°C, the lowest temperature achievable at which molecular motion vanishes so that a body would have zero heat energy. The kelvin is equal in magnitude to the degree Celsius (°C). The kelvin temperature scale (kelvin absolute temperature scale) is an absolute or thermodynamic temperature scale derived from the Celsius scale: T(K) = T(°C) + 273.15. The Rankine absolute scale is derived from the Fahrenheit scale such that T(R) = T(°F) + 459.67, i.e. a scale relative to 0 R or ?459.67°F where R is the Rankine degree symbol and °F is the Fahrenheit symbol. 相對于絕對零、0K或0K測量的溫度T?273.15°C，分子運(yùn)動(dòng)消失的最低溫度，因此物體的熱能為零。開爾文的大小等于攝氏度（℃）。開爾文溫度標(biāo)度（開爾文絕對溫度標(biāo)度）是從攝氏標(biāo)度得出的絕對或熱力學(xué)溫度標(biāo)度：T（K）=T（°C）+273.15。蘭金絕對標(biāo)度是從華氏標(biāo)度得出，使得T（R）=T（°F）+459.67，即相對于0R或0R的標(biāo)度?459.67°F，其中R是朗肯度符號，°F是華氏度符號。 |
| Absolute value error | 絕對值誤差 |
The magnitude of the error dlsregarding the algebraic sign, or, for a vectorial error, disregarding its function. 關(guān)于代數(shù)符號的誤差幅度，或者，對于矢量誤差，不考慮其函數(shù)。 |
| Absolute viscosity | 絕對粘度 |
A measure of the internal shear properties of fluids, expressed as the tangential force per unit area at either of two horizontal planes separated by one unit thickness of a given fluid, one of the planes being fixed and the other moving with unit velocity. 流體內(nèi)部剪切特性的量度，表示為兩個(gè)水平面中的任何一個(gè)上的單位面積切向力，兩個(gè)水平面被給定流體的一個(gè)單位厚度隔開，其中一個(gè)平面固定，另一個(gè)以單位速度移動(dòng)。 |
| Absolute zero | 絕對零度 |
Temperature of -273.16″C or 459.69″F or OK at which molecular motion vanishes and a body has no heat energy. 溫度為-273.16″C或459.69″F，此時(shí)分子運(yùn)動(dòng)消失且物體沒有熱能。 |
| Absorber | 吸收器 |
1. An auxiliary vibratory system that favourably modifies the vibration characteristics of a main system. 2. Part of an absorption refrigeration system in which the refrigerant is absorbed by a transport medium. 3. The absorber plate is the receiver of a concentrating solar collector where the radiation is absorbed. 1.一種輔助振動(dòng)系統(tǒng)，可有利地改變主系統(tǒng)的振動(dòng)特性。2.吸收式制冷系統(tǒng)的一部分，其中制冷劑被傳輸介質(zhì)吸收。3.吸收板是吸收輻射的聚光太陽能集熱器的接收器。 |
| Absorptance | 吸收率 |
(absorptivity, absorption coefficient, α) The fraction of radiant flux incident on a surface that is absorbed by the surface. The term also applies to absorption of radiation by a volume of fluid. For a semi-transparent surface, α + ρ + τ = 1, where ρ is the reflectance and τ is the transmittance. （吸收率，吸收系數(shù)，α）入射到表面的輻射通量被表面吸收的部分。該術(shù)語也適用于一定體積的流體對輻射的吸收。對于半透明表面，α+ρ+τ=1，其中ρ是反射率，τ是透射率。 |
| Absorption | 吸收 |
The process whereby a fluid permeates a porous solid, or a gas is dissolved by a liquid. 流體滲透多孔固體或氣體被液體溶解的過程。 |
| Absorption dynamometer | 吸收式測功機(jī) |
A dynamometer in which input work or power is dissipated by mechanical friction, electrical resistance, hydraulic resistance, etc. 通過機(jī)械摩擦、電阻、液壓阻力等耗散輸入功或功率的測功機(jī)。 |
| Absorption hygrometer | 吸收式濕度計(jì) |
An instrument that determines the content of water vapour in the atmosphere by it being absorbed into a hygroscopic medium. 通過吸收到吸濕介質(zhì)中來確定大氣中水蒸氣含量的儀器。 |
| Accelerated testing | 加速測試 |
A type of testing, for rates of wear, fatigue, corrosion etc., in which failure times are reduced by employing greater loads, more frequent power cycling, higher vibration levels, higher humidity, higher temperatures, greater potential differences etc. than would be encountered in normal operation. 一種測試類型，用于測試磨損率、疲勞率、腐蝕率等，通過采用比正常運(yùn)行中更大的負(fù)載、更頻繁的功率循環(huán)、更高的振動(dòng)水平、更高濕度、更高溫度、更大的電位差等，減少故障時(shí)間。 |
| Acceleration due to gravity | 重力加速度 |
(acceleration of free fall, gravitational acceleration, g) (Unit m/s2) The acceleration of a freely-falling body in a vacuum, with a mean value at sea level of approximately 9.81 m/s2. （自由落體加速度，重力加速度，g）（單位m/s2）自由落體在真空中的加速度，在海平面處的平均值約為9.81m/s2。 |
| Acceleration-error constant | 加速度誤差常數(shù) |
When the reference (demand) input to a control system is parabolic, the output signal will also be parabolic in steady state. The signal that is constant in this situation is the acceleration and thus for a parabolic input the steady-state error, referred to as the acceleration-error constant, is the error in the acceleration. 當(dāng)控制系統(tǒng)的參考（需求）輸入是拋物線時(shí)，輸出信號在穩(wěn)定狀態(tài)下也將是拋物線。在這種情況下恒定的信號是加速度，因此對于拋物線輸入，稱為加速度誤差常數(shù)的穩(wěn)態(tài)誤差是加速度中的誤差。 |
| Accommodation | 適應(yīng)能力 |
The ability of a robot to respond to changes in the environment. 機(jī)器人對環(huán)境變化做出反應(yīng)的能力。 |
| Achme thread | Achme螺紋 |
A screw thread having an included angle of 29° and largely used for feed screws on machine tools. 一種夾角為29°的螺紋，主要用于機(jī)床上的進(jìn)給絲杠。 |
| Acicular ferrite | 針狀鐵素體 |
A highly substructured non-equiaxed ferrite that forms upon continuous cooling by a mixed diffusion and shear mode of transformation that begins at a temperature slightly higher than the temperature transformation range for upper bainite. It is distinguished from bainite in that it has a limited amount of carbon available; thus, there is only a small amount of carbide present. Ferrite crystallite growing, apparently, as in the course of bainitic transformation. It has a lath-like shape and an increased dislocation 一種高度亞結(jié)構(gòu)的非等軸鐵素體，在連續(xù)冷卻時(shí)通過混合擴(kuò)散和剪切相變模式形成，其開始溫度略高于上貝氏體的溫度轉(zhuǎn)變范圍。它與貝氏體的區(qū)別在于它的碳含量有限。因此，僅存在少量碳化物。顯然，鐵素體微晶在貝氏體轉(zhuǎn)變過程中生長。它具有板條狀的形狀和增加的位錯(cuò)。 |
| Acid rain | 酸雨 |
Any form of precipitation, including rain, snow, sleet, fog, dew, and particulates, which contains higher than normal levels of sulfuric and nitric acids. These acids result from natural and man-made emissions of sulfur dioxide and oxides of nitrogen, respectively. Acid soot consists of unburned carbon particles, typically larger than 10 μm, in the atmosphere contaminated with sulfuric acid. The particles result from poor combustion of fossil fuels. 任何形式的降水，包括雨、雪、雨夾雪、霧、露水和顆粒物，其中含有高于正常水平的硫酸和硝酸。這些酸分別來自二氧化硫和氮氧化物的自然排放和人為排放。酸煙灰由未燃燒的碳顆粒組成，通常大于10微米，在被硫酸污染的大氣中。這些顆粒是化石燃料燃燒不良造成的。 |
| Ackerman linkage | 阿克曼裝置 |
A steering linkage on a motor vehicle that approximately gives rolling without slipping of both wheels about the turning point. This is achieved by having the inner stub axle (on the inside of the turning curve) move through a greater angle than the outer stub axle. 機(jī)動(dòng)車輛上的一種轉(zhuǎn)向聯(lián)動(dòng)裝置，在轉(zhuǎn)向點(diǎn)附近兩個(gè)車輪幾乎不會(huì)打滑。這是通過使內(nèi)短軸（在轉(zhuǎn)彎曲線的內(nèi)側(cè)）比外短軸移動(dòng)更大的角度來實(shí)現(xiàn)的。 |
| Acoustic droplet ejection | 聲液滴噴射 |
The ejection of small droplets from the surface of a liquid that results from focusing high-intensity ultrasound near the surface. 由于在表面附近聚焦高強(qiáng)度超聲波而從液體表面噴射出小液滴。 |
| Acoustic emission | 聲發(fā)射 |
(stress-wave emission) Sound emitted by some materials when deformed under load. It arises from stress waves emitted by sudden dislocation motion in crystals, slip, crack growth, etc. （應(yīng)力波發(fā)射）某些材料在負(fù)載下變形時(shí)發(fā)出的聲音。它是由晶體中突然的位錯(cuò)運(yùn)動(dòng)、滑移、裂紋擴(kuò)展等發(fā)出的應(yīng)力波引起的。 |
| Acoustic power | 聲功率 |
(sound power) (Unit W) The rate of flow of acoustic energy across a specified surface. （聲功率）（單位W）聲能流過指定表面的速率。 |
| Acoustic pyrometer | 聲學(xué)高溫計(jì) |
A non-intrusive pyrometer based on the principle that the sound speed in a gas is proportional to the square root of its absolute temperature. 一種非侵入式高溫計(jì)，其原理是氣體中的聲速與其絕對溫度的平方根成正比。 |
| Acoustic separation | 聲學(xué)分離 |
?(Unit m) The separation of particles in a fluid using standing acoustic waves, typically ultrasound, to drive them to nodal points (acoustic particle concentration). （單位m）使用駐聲波（通常是超聲波）將流體中的粒子分離，以將它們驅(qū)動(dòng)到節(jié)點(diǎn)（聲學(xué)粒子濃度）。 |
| Acoustics | 聲學(xué) |
The science and engineering of sound; its production, propagation, control, interaction with materials, etc. 聲音科學(xué)與工程；它的產(chǎn)生、傳播、控制、與材料的相互作用等。 |
| Activation energy | 活化能 |
(Ea, U) (Unit kJ/mol) The minimum energy for a chemical reaction to occur or for processes such as diffusion to take place in crystals. （Ea, U）（單位kJ/mol）發(fā)生化學(xué)反應(yīng)或在晶體中發(fā)生擴(kuò)散等過程的最小能量。 |
| Active accommodation | 主動(dòng)適應(yīng)能力 |
The use of information from sensors, for example, in a vision system, that allows a robot to show accommodation to the environment. 使用來自傳感器的信息，例如在視覺系統(tǒng)中，允許機(jī)器人顯示對環(huán)境的適應(yīng)。 |
| Active vibration suppression | 主動(dòng)振動(dòng)抑制 |
The reduction of undesirable vibration in components by feedback control. 通過反饋控制減少部件中的不良振動(dòng)。 |
| Actual cubic feet per minute | 實(shí)際立方英尺每分鐘 |
(acfm) An obsolete (i.e. non-SI) measure of volumetric flow rate; the volume of a gas flowing per minute at actual operating pressure and temperature, as opposed to the corresponding volume flow rate at STP. （acfm）已被淘汰的（即非SI）體積流量測量；在實(shí)際工作壓力和溫度下每分鐘流動(dòng)的氣體體積，與STP下的相應(yīng)體積流量相反。 |
| Actual power | 實(shí)際功率 |
(actual horsepower) (Unit W or hp) The power delivered at the output shaft of an engine, before subsequent transmission through a gearbox etc. （實(shí)際馬力）（單位W或hp）在隨后通過變速箱等傳輸之前，在發(fā)動(dòng)機(jī)輸出軸上傳遞的功率。 |
| Actual value | 實(shí)際價(jià)值 |
The output of a plant that is being controlled, i.e. the controlled variable. Not directly accessible by the control system, as it can only be measured by a sensor which may distort the measurement. 受控設(shè)備的輸出，即受控變量。控制系統(tǒng)不能直接訪問，因?yàn)樗荒苡煽赡軙?huì)扭曲測量結(jié)果的傳感器測量。 |
| Actuating system | 驅(qū)動(dòng)系統(tǒng) |
A system in which an electrical, pneumatic or hydraulic input supplied to an actuator produces force, torque, or displacement, usually in a controlled way. 一種系統(tǒng)，其中提供給執(zhí)行器的電氣、氣動(dòng)或液壓輸入通常以受控方式產(chǎn)生力、扭矩或位移。 |
| Adhesive joint | 粘合接頭 |
The point or area in which two structures are held together by an adhesive. 兩個(gè)結(jié)構(gòu)通過粘合劑粘合在一起的點(diǎn)或區(qū)域。 |
| Adhesive strength | 粘合強(qiáng)度 |
The strength of an adhesively bonded joint, usually measured in tension (perpendicular to the plane of the bonded joint) or in shear 粘合接頭的強(qiáng)度，通常以拉伸（垂直于粘合接頭的平面）或剪切測量 |
| Adhesive wear | 粘著磨損 |
Wear that develops when two surfaces slide across one another under pressure. The removal or displacement of material from a surface by the welding together and subsequent shearing of minute areas of two surfaces that slide across each other under pressure. In advanced stages, may lead to galling. Contrast with abrasive wear. 當(dāng)兩個(gè)表面在壓力下相互滑動(dòng)時(shí)產(chǎn)生的磨損。通過焊接在一起并隨后剪切在壓力下相互滑動(dòng)的兩個(gè)表面的微小區(qū)域，從表面去除或置換材料。在晚期，可能會(huì)導(dǎo)致擦傷。與磨料磨損形成對比。 |
| Aerated bath nitriding | 空氣攪拌液體滲氮法 |
A type of liquid nitriding in which air is pumped through the molten bath creating agitation and increased chemical activity. 一種液體氮化，其中空氣被泵入熔池，產(chǎn)生攪拌并增加化學(xué)活性。 |
| Age hardening | 時(shí)效硬化 |
Raising the strength and hardness of an alloy by heating a supersaturated solid solution at a relatively low temperature to induce precipitation of a finely dispersed second phase. Also known as aging or precipitation hardening. Hardening by aging, usually after rapid cooling or cold working. 通過在相對較低的溫度下加熱過飽和固溶體以誘導(dǎo)細(xì)分散的第二相沉淀來提高合金的強(qiáng)度和硬度。也稱為時(shí)效或沉淀硬化。通常在快速冷卻或冷加工后。 |
| Age softening | 時(shí)效軟化 |
Spontaneous decrease of strength and hardness that takes place at room temperature in certain strain hardened alloys, especially those of aluminum. 某些應(yīng)變硬化合金，尤其是鋁合金，在室溫下會(huì)發(fā)生強(qiáng)度和硬度的自發(fā)降低。 |
| Aging treatment | 時(shí)效處理 |
Heat treatment aimed at age hardening; it comprises solution and precipitation treatments. 針對時(shí)效硬化的熱處理；它包括溶液和沉淀處理。 |
| Air classifier | 空氣分級機(jī) |
(air elutriator) A device in which an airstream, which may be swirling, sorts particles by a combination of size, shape, and mass. （空氣淘析器）一種裝置，在該裝置中，氣流（可能是漩渦）根據(jù)大小、形狀和質(zhì)量的組合對顆粒進(jìn)行分類。 |
| Air cleaner | 空氣凈化器 |
A device, such as a filter, hydrocyclone, or electrostatic precipitator, that removes particles and aerosols from a flow of air. 一種設(shè)備，例如過濾器、水力旋流器或靜電除塵器，用于從氣流中去除顆粒和氣溶膠。 |
| Air composition | 空氣成分 |
The sea-level composition (in per cent by volume) of air at a temperature of 15°C and a pressure of 1 atm is mainly 78.084% nitrogen, 20.947% oxygen and 0.934% argon. The remaining 0.035% consists of carbon dioxide, neon, helium, methane, krypton, hydrogen, oxides of nitrogen, xenon, ozone, iodine, carbon monoxide, and ammonia. Different sources give slightly different figures for the composition. Not included are water vapour (typically 0.4%) and pollutants such as sulfur dioxide. 在15°C的溫度和1個(gè)大氣壓的壓力下，空氣的海平面成分（體積百分比）主要是78.084%的氮?dú)狻?0.947%的氧氣和0.934%的氬氣。剩余的0.035%由二氧化碳、氖、氦、甲烷、氪、氫、氮的氧化物、氙、臭氧、碘、一氧化碳和氨組成。不同的來源給出的組成略有不同。不包括水蒸氣（通常為0.4%）和二氧化硫等污染物。 |
| Air compressor | 空氣壓縮機(jī) |
A turbomachine that draws in air and delivers it at higher pressure, temperature, and density. It can be of axial, fan, reciprocating, or rotary design. 一種渦輪機(jī)，它吸入空氣并以更高的壓力、溫度和密度輸送空氣。它可以是軸流式、風(fēng)扇式、往復(fù)式或旋轉(zhuǎn)式設(shè)計(jì)。 |
| Air conditioning | 空調(diào) |
The process of controlling the temperature and humidity in rooms, buildings, aircraft, passenger vehicles, etc. More generally it includes control of dust, levels of radiant heat, etc. 控制房間、建筑物、飛機(jī)、客運(yùn)車輛等的溫度和濕度的過程。更一般地說，它包括控制灰塵、輻射熱水平等。 |
| Air pump | 氣泵 |
A machine for providing a flow of air or for increasing or decreasing the mass and pressure of air in a closed container. The term pump is more usual when the working fluid is a liquid, while compressor is more usual for gases. 一種用于提供空氣流動(dòng)或用于增加或減少密閉容器中空氣質(zhì)量和壓力的機(jī)器。當(dāng)工作流體是液體時(shí)，術(shù)語泵更常用，而氣體更常用壓縮機(jī)。 |
| Air-cooled condenser | 風(fēng)冷冷凝器 |
A heat exchanger, in which the cooling medium is air, used to condense the exhaust steam from a steam turbine, the condensate being returned to the boiler. 一種熱交換器，其中冷卻介質(zhì)為空氣，用于冷凝蒸汽輪機(jī)排出的蒸汽，冷凝水返回鍋爐。 |
| Air-cooled engine | 風(fēng)冷發(fā)動(dòng)機(jī) |
An internal-combustion engine directly cooled by airflow, rather than by water flowing through the engine block being cooled by a radiator. 一種由氣流直接冷卻的內(nèi)燃機(jī)，而不是通過流經(jīng)發(fā)動(dòng)機(jī)缸體的水被散熱器冷卻。 |
| Air-hardening steel | 空氣硬化鋼 |
A steel containing sufficient carbon and other alloying elements to harden fully during cooling in air or other gaseous mediums from a temperature above its transformation range. The terms should be restricted to steels that are capable of being hardened by cooling in air in fairly large sections, about 2 in. (50 mm) or more in diameter. Same as self-hardening steel. 一種鋼，含有足夠的碳和其他合金元素，可以在空氣或其他氣體介質(zhì)中從高于其轉(zhuǎn)變范圍的溫度冷卻過程中完全硬化。這些術(shù)語應(yīng)僅限于能夠通過在相當(dāng)大的截面（直徑約2英寸（50毫米）或更大）中通過空氣冷卻而硬化的鋼。與自硬鋼相同。 |
| AISC | AISC |
The American Institute of Steel Construction. 美國鋼結(jié)構(gòu)學(xué)會(huì)。 |
| Allotropy | 同素異形體 |
A near synonym for polymorphism. Allotropy is generally restricted to describing polymorphic behavior in elements, terminal phases, and alloys whose behavior closely parallels that of the predominant constituent element. 多態(tài)性的近義詞。同素異形體通常僅限于描述元素、終端相和合金中的多晶型行為，其行為與主要組成元素的行為非常相似。 |
| Allowable stress | 許用應(yīng)力 |
The maximum stress a designer can assume that the parts will stand. It is always less than the minimum strength of the material. For example, the ASME Boiler and Pressure Vessel Code typically specifies an allowable stress that is one-quarter of the service temperature yield strength of the material. This introduces a four-to-one safety factor into the design process and is intended to compensate for uncertainties in estimates of strength, service loads, etc. 設(shè)計(jì)師可以假設(shè)零件能夠承受的最大應(yīng)力。它總是小于材料的最小強(qiáng)度。例如，ASME鍋爐和壓力容器規(guī)范通常指定允許應(yīng)力為材料使用溫度屈服強(qiáng)度的四分之一。這在設(shè)計(jì)過程中引入了四比一的安全系數(shù)，旨在補(bǔ)償強(qiáng)度、服務(wù)載荷等估計(jì)的不確定性。 |
| Allowable stress design | 許用應(yīng)力設(shè)計(jì) |
A design procedure developed for the AISC by the Research Council on Structural Connections. Purposely underestimates the strengths of bolts and joint materials to introduce safety factors into the design of structural steel joints. It is an alternative to the more recently defined load and resistance factor design procedure. 結(jié)構(gòu)連接研究委員會(huì)為AISC制定的設(shè)計(jì)程序。故意低估螺栓和接頭材料的強(qiáng)度，以便在結(jié)構(gòu)鋼接頭的設(shè)計(jì)中引入安全系數(shù)。它是最近定義的荷載和阻力系數(shù)設(shè)計(jì)程序的替代方法。 |
| Alloy | 合金 |
1. A metallic material composed of two or more elements, one of which is usually a metal to which the other elements are added, e.g. iron-carbon or aluminium-copper (binary alloy); nickel-chromium-iron (ternary alloy). 2. A plastic produced as a blend of two or more immiscible polymers. This results in material that cannot be achieved by polymerization. 1.由兩種或多種元素組成的金屬材料，其中一種通常是添加了其他元素的金屬，例如鐵碳或鋁銅（二元合金）；鎳鉻鐵（三元合金）。2.由兩種或多種不混溶聚合物混合而成的塑料。這導(dǎo)致無法通過聚合獲得的材料。 |
| Alloy steels | 合金鋼 |
Steels that contain alloying elements such as chromium, nickel, molybdenum, manganese, silicon, tungsten, and vanadium. These are added to improve properties such as the hardenability, toughness, strength, wear resistance, and corrosion resistance compared with those of plain-carbon steel. Low-alloy steels have a total alloy content (including carbon) of less than about 8%. They are hardenable and have strength up to 30% higher than plain-carbon steels. High-alloy steels contain considerably more alloy content and are developed for specific properties such as superior corrosion and chemical resistance. 含有鉻、鎳、鉬、錳、硅、鎢和釩等合金元素的鋼。添加這些是為了提高與普通碳鋼相比的淬透性、韌性、強(qiáng)度、耐磨性和耐腐蝕性等性能。低合金鋼的總合金含量（包括碳）小于約8%。它們是可硬化的，強(qiáng)度比普通碳鋼高出30%。高合金鋼含有相當(dāng)多的合金含量，并針對特定性能而開發(fā)，例如卓越的耐腐蝕性和耐化學(xué)性。 |
| Alloying element | 合金元素 |
Component added deliberately with the aim of improving the properties of an alloy. Alloying elements can affect the existence range of equilibrium phases present in an unalloyed material, or lead to the occurrence of new phases, or both. In addition, alloying elements strongly affect the kinetics of phase transformations and thus the microstructure formation in alloyed materials. 為改善合金性能而有意添加的成分。合金元素可以影響非合金材料中存在的平衡相的存在范圍，或?qū)е滦孪嗟某霈F(xiàn)，或兩者兼而有之。此外，合金元素強(qiáng)烈影響相變動(dòng)力學(xué)，從而影響合金材料的微觀結(jié)構(gòu)形成。 |
| Alpha iron | 阿爾法鐵 |
The body-centered cubic form of pure iron, stable below 910 °C (1670 °F). 純鐵的體心立方形式，在910°C(1670°F)以下穩(wěn)定。 |
| Alternating stress | 交替應(yīng)力 |
?(Unit Pa) Originally, stresses of changing sign (tension-tocompression-to-tension, etc.) in a component produced by alternating forces acting in opposite directions, but now generally used to describe stresses that vary but may keep the same sign, as produced by periodic, out-of–balance, or vibrational loads. （單位Pa）最初，構(gòu)件中由相反方向的交變力產(chǎn)生的符號變化的應(yīng)力（張力到壓縮到張力等），但現(xiàn)在通常用于描述變化但可能保持相同符號的應(yīng)力，如由周期性、失衡或振動(dòng)載荷產(chǎn)生的應(yīng)力。 |
| Alternative energy | 可替代能源 |
(alternate energy) Energy sources that are renewable and do not have the undesired consequences of fossil fuels and nuclear energy. （替代能源）可再生能源，不會(huì)產(chǎn)生化石燃料和核能的不良后果。 |
| Altitude | 高度 |
(Unit m) Vertical height measured relative to a specified datum such as sea level. （單位m）相對于特定基準(zhǔn)（例如海平面）測量的垂直高度。 |
| Altitude chamber | 高空艙 |
(hypobaric chamber) A chamber in which conditions at different altitudes are simulated by a combination of appropriate pressures, temperatures and relative humidity. （低壓艙）通過適當(dāng)?shù)膲毫?、溫度和相對濕度的組合來模擬不同高度條件的艙室。 |
| Amontons friction | 阿蒙頓摩擦 |
(Coulomb friction) Friction between surfaces where the ratio of the frictional force F to the normal force N is constant and independent of the area in contact. （庫侖摩擦）摩擦力F與法向力N之比恒定且與接觸面積無關(guān)的表面之間的摩擦。 |
| Amplifier | 放大器 |
A device by which the output of a hydraulic, pneumatic, or electrical source is increased. 增加液壓、氣動(dòng)或電源輸出的裝置。 |
| Anelastic | 無彈性 |
Literally ‘not elastic’, but in practice used for materials that display timedependent recovery on unloading. 字面意思是“沒有彈性”，但實(shí)際上用于在卸載時(shí)顯示隨時(shí)間恢復(fù)的材料。 |
| Angle of attack (α) | 攻角（α） |
(Unit °) The angle between a reference line on a lifting body and the vector direction of the relative velocity between the body and the fluid through which it is moving. In the case of an aerofoil, turbine, or compressor blade, the usual reference line is the chord line. （單位°）升力體上的參考線與升力體與其運(yùn)動(dòng)通過的流體之間的相對速度的矢量方向之間的角度。在機(jī)翼、渦輪或壓縮機(jī)葉片的情況下，通常的參考線是弦線。 |
| Angle of contact | 接觸角 |
(Unit °) The angle subtended at the centre of a pulley or sprocket wheel by the circumferential contact of a belt or chain. （單位°）皮帶或鏈條的圓周接觸在皮帶輪或鏈輪的中心所對的角度。 |
| Angle of friction | 摩擦角 |
(friction angle, β) (Unit °) For a body in contact with a plane surface, the angle between the normal to the surface and the resultant force between the body and the surface. If the friction force is F and normal force is N, β is given by F/N = μ = tan β where μ is the coefficient of friction. （摩擦角，β）（單位°）對于與平面接觸的物體，表面法線與物體與表面之間的合力之間的夾角。如果摩擦力為F，法向力為N，則β由F/N=μ=tanβ給出，其中μ是摩擦系數(shù)。 |
| Angle of thread | 螺紋角度 |
The included angle between the sides forming the groove of the screw thread. 形成螺紋凹槽的邊之間的夾角。 |
| Angle of torsion | 扭轉(zhuǎn)角 |
(angle of twist) (Unit ° or rad) The angle relative to a chosen section, normal to the axis of twist, through which another part of a component rotates when subjected to a torque. （扭轉(zhuǎn)角）（單位°或弧度）相對于選定截面的角度，垂直于扭轉(zhuǎn)軸，部件的另一部分在受到扭矩時(shí)通過該角度旋轉(zhuǎn)。 |
| Angstr?m (?) | 昂斯特羅姆（?） |
An obsolete (non-SI) unit of length, sometimes still employed for atomic and crystallographic measurements. The conversion to SI is 1 ? = 10?10?m. 一種已被淘汰的（非SI）長度單位，有時(shí)仍用于原子和晶體學(xué)測量。轉(zhuǎn)換為SI為1?=10-10m。 |
| Angularity | 角度 |
The underfaces of the nut and the bolt head should be exactly perpendicular to the thread or shank axes. If the angle between the face and the axis is, for example, 868 or 948, the fastener is said to have an angularity of 48 (sometimes called Perpendicularity). 螺母和螺栓頭的底面應(yīng)與螺紋或柄軸完全垂直。例如，如果面和軸之間的角度為868或948，則稱緊固件的角度為48（有時(shí)稱為垂直度）。 |
| Anisotropy | 各向異性 |
The characteristic of exhibiting different values of a property in different directions with respect to a fixed reference system in the material. 相對于材料中的固定參考系統(tǒng)，在不同方向上表現(xiàn)出不同屬性值的特性。 |
| Anneal to temper | 退火回火 |
A final partial anneal that softens a cold worked nonferrous alloy to a specified level of hardness or tensile strength. 將冷加工的有色金屬合金軟化到規(guī)定的硬度或抗拉強(qiáng)度水平的最終局部退火。 |
| Annealing | 退火 |
A generic term denoting a treatment, consisting of heating to and holding at a suitable temperature followed by cooling at a suitable rate, used primarily to soften metallic materials, but also to simultaneously produce desired changes in other properties or in microstructure. 一個(gè)通用術(shù)語，表示一種處理，包括加熱并保持在合適的溫度，然后以合適的速率冷卻，主要用于軟化金屬材料，但也同時(shí)產(chǎn)生其他性能或微觀結(jié)構(gòu)的所需變化。 |
| Annealing carbon | 退火碳 |
Fine, apparently amorphous carbon particles formed in white cast iron and certain steels during prolonged annealing. Also called temper carbon. 白口鑄鐵和某些鋼在長時(shí)間退火過程中形成的細(xì)小、明顯的無定形碳顆粒。也稱為回火碳。 |
| Annealing twin | 退火孿晶 |
A twin form in a crystal during recrystallization. 重結(jié)晶過程中晶體中的孿晶形式。 |
| Anode | 陽極 |
That electrode in a battery or corrosion cell which produces electrons. It is the electrode which is destroyed (corrodes). 電池或腐蝕電池中產(chǎn)生電子的電極。被破壞（腐蝕）的是電極。 |
| ANSI | ANSI |
The acronym for American National Standards Institute. 美國國家標(biāo)準(zhǔn)協(xié)會(huì)的縮寫。 |
| Anti-freeze | 防凍液 |
A substance such as ethylene glycol added to the cooling system of a watercooled engine to lower the freezing point of the cooling water and also inhibit the formation of rust and other deposits. 一種物質(zhì)，如乙二醇，添加到水冷發(fā)動(dòng)機(jī)的冷卻系統(tǒng)中，以降低冷卻水的冰點(diǎn)，并抑制生銹和其他沉積物的形成。 |
| Apparent area of contact | 表觀接觸面積 |
In tribology, the area of contact between two solid surfaces defined by the boundaries of their macroscopic interface. 在摩擦學(xué)中，兩個(gè)固體表面之間的接觸區(qū)域由其宏觀界面的邊界定義。 |
| Applied thermodynamics | 應(yīng)用熱力學(xué) |
(engineering thermodynamics, thermodynamics) The science of the relationship between heat, work and the properties of systems and the ways in which heat energy from fuels can be converted into mechanical work. It involves the study of all aspects of energy use and energy transformation, including power generation, refrigeration, the relevant properties of the substances involved and the relationships between them. The principle of conservation of energy is a fundamental law of nature. （工程熱力學(xué)、熱力學(xué)）熱、功和系統(tǒng)特性之間關(guān)系的科學(xué)，以及燃料中的熱能可以轉(zhuǎn)化為機(jī)械功的方式。它涉及能源使用和能源轉(zhuǎn)換的各個(gè)方面的研究，包括發(fā)電、制冷、所涉及物質(zhì)的相關(guān)特性以及它們之間的關(guān)系。能量守恒定律是自然的基本規(guī)律。 |
| Arbitration bar | 抗彎試棒 |
A test bar, cast with a heat of material, used to determine chemical composition, hardness, tensile strength, and deflection and strength under transverse loading in order to establish the state of acceptability of the casting. 用熱材料鑄造的測試棒，用于確定化學(xué)成分、硬度、抗拉強(qiáng)度、橫向載荷下的撓度和強(qiáng)度，以確定鑄件的可接受狀態(tài)。 |
| Archimedes screw | 阿基米德螺旋泵 |
A machine which comprises a rotating helical blade inside a closefitting tube, which may be used to pump liquids, slurries (such as sewage), granular materials, etc. If water flows into the top of an inclined or vertical Archimedes screw, the screw will rotate and can be used to drive an electrical generator. 一種機(jī)器，它在緊密的管子內(nèi)包含一個(gè)旋轉(zhuǎn)的螺旋葉片，可用于泵送液體、泥漿（如污水）、顆粒材料等。如果水流入傾斜或垂直的阿基米德螺桿的頂部，螺桿將旋轉(zhuǎn)，可用于驅(qū)動(dòng)發(fā)電機(jī)。 |
| Archimedes Wave Swing | 阿基米德波擺動(dòng) |
A machine for tidal-power energy generation consisting of two concentric, air-filled submerged cylinders. The inner lower cylinder is tethered to the ocean floor while the upper floater unit, which is closed at the top, moves up and down due to the variations in hydrostatic pressure caused by the wave motion. The relative movement of the two cylinders is used to generate electricity in which linear motion replaces the more common rotary motion of an electromagnetic generator. 一種用于潮汐能發(fā)電的機(jī)器，由兩個(gè)同心的充氣水下氣缸組成。內(nèi)部下部圓柱體系在海底，而頂部封閉的上部浮子單元由于波浪運(yùn)動(dòng)引起的靜水壓力變化而上下移動(dòng)。兩個(gè)氣缸的相對運(yùn)動(dòng)用于發(fā)電，其中直線運(yùn)動(dòng)取代了電磁發(fā)電機(jī)更常見的旋轉(zhuǎn)運(yùn)動(dòng)。 |
| Artificial aging | 人工時(shí)效 |
Aging above room temperature. 在室溫以上的時(shí)效。 |
| ASME | ASME |
The American Society of Mechanical Engineers. 美國機(jī)械工程師學(xué)會(huì)。 |
| Aspect ratio | 縱橫比 |
The ratio of the longest to the shortest dimension of a shape or object e.g. the chord-to-thickness ratio of an aerofoil or the span-to-chord ratio of a wing. 形狀或物體的最長與最短尺寸之比，例如機(jī)翼的弦厚比或機(jī)翼的翼展弦比。 |
| Assembly drawing | 裝配圖紙 |
An engineering drawing that shows how parts are assembled to produce a component or a complete machine. It may include sections to show internal features, dimensions that are critical for assembly, manufacturing information, and part numbers. 顯示零件如何組裝以生產(chǎn)組件或整機(jī)的工程圖。它可能包括顯示內(nèi)部特征、對裝配至關(guān)重要的尺寸、制造信息和零件編號的部分。 |
| Assembly line | 流水線 |
A system of mass production in which work is moved progressively from one operation to another, ultimately to give the final complete product. 一種大規(guī)模生產(chǎn)系統(tǒng)，其中工作逐漸從一個(gè)操作轉(zhuǎn)移到另一個(gè)操作，最終得到完整產(chǎn)品。 |
| Athermal transformation | 非熱變化 |
A reaction that proceeds without benefit of thermal fluctuations; that is, thermal activation is not required. In contrast, a reaction that occurs at constant temperature is an isothermal transformation; thermal activation is necessary in this case and the reaction proceeds as a function of time. 在沒有熱波動(dòng)的情況下進(jìn)行的反應(yīng)；也就是說，不需要熱激活。相反，在恒溫下發(fā)生的反應(yīng)是等溫轉(zhuǎn)變。在這種情況下，熱活化是必要的，并且反應(yīng)作為時(shí)間的函數(shù)進(jìn)行。 |
| Atmometer | 氣壓計(jì) |
(atmidometer, evaporimeter) An instrument that measures the rate of evaporation of water from a surface into the atmosphere. （濕度計(jì)，蒸發(fā)計(jì)）測量水從表面蒸發(fā)到大氣中的速率的儀器。 |
| Atmosphere | 大氣 |
1. (atm) An obsolete (non-SI) unit of pressure equal to 101 325 Pa or 1.013 25 bar and approximately equal to the atmospheric pressure (barometric pressure) measured at mean sea level. 1.（atm）一種已被淘汰的（非SI）壓力單位，等于101325Pa或1.01325bar，大約等于在平均海平面測量的大氣壓力（大氣壓）。 |
| Atmospheric pressure | 氣壓 |
The downward force exerted by the atmosphere because of its weight, (gravitational attraction to the Earth), measured by barometers, and usually expressed in units of millibars. Standard atmospheric pressure at sea level is 1013.25 mb.expressed in units of millibars. Standard atmospheric pressure at sea level is 1013.25 mb. 大氣由于其重量（對地球的引力）而施加的向下的力，用氣壓計(jì)測量，通常以毫巴為單位表示。海平面的標(biāo)準(zhǔn)大氣壓為1013.25mb。以毫巴為單位表示。海平面的標(biāo)準(zhǔn)大氣壓為1013.25mb。 |
| Atom | 原子 |
The smallest unit of matter that has the properties of a chemical element. The simplest description of an atom (Bohr model) is of a compact nucleus surrounded by one or more orbiting electrons. 具有化學(xué)元素性質(zhì)的最小物質(zhì)單位。原子的最簡單描述（玻爾模型）是由一個(gè)或多個(gè)軌道電子包圍的致密原子核。 |
| Atomic volume | 原子體積 |
Volume of unit cell per atom. 每個(gè)原子的晶胞體積。 |
| Atomization | 霧化 |
The production of a spray of fine droplets from a liquid, such as diesel oil or petrol, by injection through a nozzle (an atomizer). 通過噴嘴（霧化器）噴射從液體（例如柴油或汽油）中產(chǎn)生細(xì)小液滴噴霧。 |
| Atomizing humidifier | 霧化加濕器 |
A humidifier that functions by spraying fine droplets of water into an airstream. 一種加濕器，通過將細(xì)小的水滴噴射到氣流中來發(fā)揮作用。 |
| Ausforming | 形變熱處理 |
Thermomechanical treatment of steel in the metastable austenitic condition below the recrystallization temperature followed by quenching to obtain martensite and/or bainite. 在低于再結(jié)晶溫度的亞穩(wěn)態(tài)奧氏體條件下對鋼進(jìn)行熱機(jī)械處理，然后淬火以獲得馬氏體和/或貝氏體。 |
| Austempered steels | 等溫鋼 |
Medium to high carbon steels with improved mechanical properties as a result of austempering. After heating to between 800° and 900°C to form the austenite phase, they are quenched to, and held at, just above the martensite transformation range (between 260° and 370°C) to form bainite, before cooling further. Austempering of ductile cast irons results in a microstructure of bainite and spheroidal graphite. Austempered ductile irons have excellent toughness and wear properties. 由于等溫淬火，機(jī)械性能得到改善的中高碳鋼。在加熱到800°和900°C之間形成奧氏體相后，將它們淬火并保持在略高于馬氏體轉(zhuǎn)變范圍（260°和370°C之間）以形成貝氏體，然后進(jìn)一步冷卻。球墨鑄鐵的等溫淬火導(dǎo)致貝氏體和球狀石墨的微觀結(jié)構(gòu)。等溫淬火球墨鑄鐵具有優(yōu)異的韌性和耐磨性。 |
| Austempering | 等溫淬火 |
A heat treatment for ferrous alloys in which a part is quenched from the austenitizing temperature at a rate fast enough to avoid formation of ferrite or pearlite and then held at a temperature just above Ms until transformation to bainite is complete. Although designated as bainite in both austempered steel and austempered ductile iron (ADI), austempered steel consists of two phase mixtures containing ferrite and carbide, while austempered ductile iron consists of two phase mixtures containing ferrite and austenite. Heat treatment comprising austenitization of a steel article, cooling it to a bainitic range at a rate higher than the critical cooling rate and holding at a fixed temperature until the completion of bainitic transformation. 一種鐵合金的熱處理，其中零件從奧氏體化溫度以足夠快的速度淬火，以避免形成鐵素體或珠光體，然后保持在略高于Ms的溫度，直到完全轉(zhuǎn)變?yōu)樨愂象w。雖然在奧氏體鋼和奧氏體球鐵(ADI)中都被指定為貝氏體，但奧氏體鋼由含有鐵素體和碳化物的兩相混合物組成，而奧氏體球墨鑄鐵由含有鐵素體和奧氏體的兩相混合物組成。熱處理包括鋼制品的奧氏體化，以高于臨界冷卻速率的速率將其冷卻到貝氏體范圍，并保持在固定溫度直到貝氏體轉(zhuǎn)變完成。 |
| Austenite | 奧氏體 |
A solid solution of one or more elements in face-centered cubic iron. Unless otherwise designated (such as nickel austenite), the solute is generally assumed to be carbon. Solid solution of alloying elements and/or carbon in γ-Fe. It is named after British metallurgist W. C. Roberts-Austen. 一種或多種元素在面心立方鐵中的固溶體。除非另有說明（如鎳奧氏體），溶質(zhì)通常假定為碳。合金元素和/或碳在γ-Fe中的固溶體。它以英國冶金學(xué)家WCRoberts-Austen的名字命名。 |
| Austenite finish temperature (Af) | 奧氏體完成溫度（Af） |
Temperature at which the transformation of martensite into austenite completes upon heating. The same designation is also applied to nonferrous alloys in which martensite transforms into some parent phase. 加熱時(shí)馬氏體轉(zhuǎn)變?yōu)閵W氏體的溫度。相同的名稱也適用于馬氏體轉(zhuǎn)變?yōu)槟承┠赶嗟挠猩辖稹?/td> |
| Austenite stabilization | 奧氏體穩(wěn)定化 |
Decrease, in comparison to a continuous cooling, in the amount of martensite occurring from austenite when cooling is interrupted at a temperature between Ms?and Mf. This can be explained by the relaxation of stresses induced in the austenite by martensite crystals occurring before the interruption. The relaxation, in turn, leads to the dislocation rearrangement and their interaction with martensite/austenite interfaces, which makes the interfaces immobile. 與連續(xù)冷卻相比，當(dāng)在Ms和Mf之間的溫度中斷冷卻時(shí)，從奧氏體中產(chǎn)生的馬氏體的量減少。這可以通過中斷前發(fā)生的馬氏體晶體在奧氏體中引起的應(yīng)力松弛來解釋。反過來，松弛導(dǎo)致位錯(cuò)重排及其與馬氏體/奧氏體界面的相互作用，這使得界面無法移動(dòng)。 |
| Austenite-stabilizer | 奧氏體穩(wěn)定劑 |
Alloying element expanding the γ-phase field in the corresponding phase diagram, which manifests itself in a decrease of the A3?temperature and an increase of the A4?temperature in binary alloys Fe–M as well as in a decrease of A1?temperature in ternary alloys Fe–C–M (M is an alloying element). The solubility of austenite-stabilizers in ferrite is much lower than in austenite. Under the influence of austenite-stabilizers, austenite can become thermodynamically stable down to room temperature. 合金元素?cái)U(kuò)展了相應(yīng)相圖中的γ相場，這表現(xiàn)為二元合金Fe-M中A3溫度的降低和A4溫度的升高，以及A1溫度的降低三元合金Fe–C–M（M是合金元素）。奧氏體穩(wěn)定劑在鐵素體中的溶解度遠(yuǎn)低于在奧氏體中的溶解度。在奧氏體穩(wěn)定劑的影響下，奧氏體可以在低至室溫時(shí)變得熱力學(xué)穩(wěn)定。 |
| Austenitic grain size | 奧氏體晶粒尺寸 |
The size attained by the grains of steel when heated to the austenitic region; may be revealed by appropriate etching of cross sections after cooling to room temperature. 當(dāng)加熱到奧氏體區(qū)域時(shí)鋼晶粒達(dá)到的尺寸；冷卻至室溫后，可通過適當(dāng)蝕刻橫截面來顯示。 |
| Austenitic stainless steels | 奧氏體不銹鋼 |
Austenitic stainless steels are non-magnetic. They contain significant additions of chromium (16–30%), but have the austenite (FCC) crystal structure, stabilized by the addition of nickel in the composition range 6–20%. Carbon content ranges from about 0.03 to 0.15%. The ‘18–8’ stainless steels containing approximately 18% chromium and 8% nickel are typical of the class. Austenitic stainless steels have high strength and corrosion resistance even at elevated temperatures, good ductility, good low-temperature properties, and good weldability. Used for aircraft and transport equipment, cutlery, chemical and food-processing equipment, surgical instruments, and cryogenic vessels. 奧氏體不銹鋼是非磁性的。它們含有顯著添加的鉻（16–30%），但具有奧氏體（FCC）晶體結(jié)構(gòu)，通過在6–20%的成分范圍內(nèi)添加鎳來穩(wěn)定。碳含量范圍約為0.03至0.15%。含有大約18%鉻和8%鎳的“18-8”不銹鋼是該級別的典型不銹鋼。奧氏體不銹鋼即使在高溫下也具有高強(qiáng)度和耐腐蝕性，良好的延展性，良好的低溫性能和良好的焊接性。用于飛機(jī)和運(yùn)輸設(shè)備、餐具、化學(xué)和食品加工設(shè)備、手術(shù)器械和低溫容器。 |
| Austenitizing | 奧氏體化 |
Forming austenite by heating a ferrous alloy into the transformation range (partial austenitizing) or above the transformation range (complete austenitizing). When used without qualification, the term implies complete austenitizing. 通過將鐵合金加熱到轉(zhuǎn)變范圍（部分奧氏體化）或高于轉(zhuǎn)變范圍（完全奧氏體化）來形成奧氏體。當(dāng)不加限定地使用時(shí)，該術(shù)語意味著完全奧氏體化。 |
| Autonomous energy system | 自主能源系統(tǒng) |
(stand-alone energy system) A sole source of electricity, usually small-scale, for applications remote from a grid, especially with energy storage in the system. Hydroelectric, photovoltaic, wind-power and other renewable systems are well suited to stand-alone applications. （獨(dú)立能源系統(tǒng)）一種唯一的電力來源，通常是小規(guī)模的，用于遠(yuǎn)離電網(wǎng)的應(yīng)用，尤其是系統(tǒng)中的能量存儲。水電、光伏、風(fēng)力和其他可再生能源系統(tǒng)非常適合獨(dú)立應(yīng)用。 |
| Auxetic materials | 拉脹材料 |
Those man-made materials for which Poisson’s ratio is negative, so that the cross section expands when subjected to a longitudinal tensile stress and contracts when subjected to a longitudinal compressive stress. 泊松比為負(fù)的人造材料，其橫截面在受到縱向拉應(yīng)力時(shí)會(huì)膨脹，在受到縱向壓應(yīng)力時(shí)會(huì)收縮。 |
| Auxiliary power unit (APU) | 輔助動(dòng)力裝置（APU） |
In aircraft–gas–turbine applications, a small gas turbine used to provide start-up power, electrical and hydraulic power, and compressed air for cabin ventilation. In other applications, an APU may be a gas turbine or internal-combustion engine used to provide emergency power. 在飛機(jī)-燃?xì)廨啓C(jī)應(yīng)用中，小型燃?xì)廨啓C(jī)用于提供啟動(dòng)動(dòng)力、電力和液壓動(dòng)力以及用于機(jī)艙通風(fēng)的壓縮空氣。在其他應(yīng)用中，APU可以是用于提供應(yīng)急動(dòng)力的燃?xì)廨啓C(jī)或內(nèi)燃機(jī)。 |
| Available draught (Unit Pa) | 可用通風(fēng)量（單位Pa） |
The reduced pressure of combustion gases in a furnace or boiler, either forced or due to the buoyancy of hot gases, which is used to draw in combustion air and remove products of combustion. 爐子或鍋爐中燃燒氣體的壓力降低，無論是強(qiáng)制還是由于熱氣體的浮力，用于吸入燃燒空氣并去除燃燒產(chǎn)物。 |
| Available head (Unit m) | 可用水頭（單位米） |
In a hydroelectric power system, the difference between the vertical height of the water level in the supply reservoir above the turbine inlet less the head loss due to friction and fittings in the duct leading to the turbine. 在水力發(fā)電系統(tǒng)中，水輪機(jī)入口上方供水水庫中水位垂直高度之間的差減去由于通向渦輪機(jī)的管道中的摩擦和配件造成的水頭損失。 |
| Available resource | 可用資源 |
(total resource) (Unit J) The total annual energy theoretically available from a renewable-energy source, such as ocean waves, the wind, or the total incident solar energy. （總資源）（單位J）理論上可從可再生能源（例如海浪、風(fēng)或總?cè)肷涮柲埽┇@得的年度總能量。 |
| Avogadro constant | 阿伏伽德羅常數(shù) |
(Avogadro number, NA) A fundamental physical constant with the fixed numerical value 6.022 140 76 × 1023 mol?1. The mole contains exactly this number of elementary entities. A minor adjustment to the value of the Avogadro constant was made effective on 20 May 2019. （阿伏伽德羅數(shù)，NA）一個(gè)固定數(shù)值為6.02214076×1023mol的基本物理常數(shù)?摩爾正好包含這個(gè)數(shù)量的基本實(shí)體。對阿伏伽德羅常數(shù)值的微小調(diào)整于2019年5月20日生效。 |
| Axial load (Unit N) | 軸向載荷（單位N） |
In general, a tensile or compressive load directed along the axis of a component. Strictly the load should pass through the centroid of the cross section to avoid inducing bending moments and be perpendicular to the plane of the section. 通常，沿部件的軸定向的拉伸或壓縮載荷。嚴(yán)格來說，載荷應(yīng)通過橫截面的質(zhì)心以避免產(chǎn)生彎矩并垂直于橫截面。 |