📚 AS Edexcel Engineering: Quick Vocabulary and Terminology Memorization Guide | AS Edexcel 工程：词汇术语速记指南
Mastering engineering terms can feel like learning a new language. This AS Edexcel Engineering vocabulary guide breaks down essential terminology into memorable chunks. Each term is accompanied by a clear English definition, a Chinese equivalent, and a quick memory hook to help you recall it under exam conditions.
掌握工程术语就像学习一门新语言。这份 AS Edexcel 工程词汇指南将基本术语分解成易记的块。每个术语都配有清晰的英文定义、中文对应和快速记忆钩子，帮助你在考试中回忆。
1. Mechanical Properties | 力学性能
Strength: The capacity of a material to withstand an applied load without fracture. Think 'strength = withstand force'.
强度：材料承受载荷而不发生断裂的能力。联想“强度=承受力度”。
Hardness: stance to indentation or scratching. Common tests: Brinell, Vickers, Rockwell. Memory aid: 'Hard = Hard to scratch'.
硬度：抵抗压入或划痕的能力。常用测试：布氏、维氏、洛氏。记忆点：“硬的东西难以被划伤”。
Toughness: The amount of energy a material can absorb before fracture. Combines strength and ductility. Mnemonic: 'Tough materials take a beating without breaking'.
韧性：材料断裂前吸收的能量。结合了强度与延展性。口诀：“韧性好，挨打不破”。
Ductility: Ability to be stretched into a wire without snapping. Think of copper wires. 'Ductile = can be drawn'.
延展性：能被拉伸成丝而不断裂的性质。想起铜线。'延展性＝可以拉长'。
Stiffness: The resistance of a material to elastic deformation. Quantified by Young's modulus. High stiffness = minimal bend under load.
刚度：材料抵抗弹性变形的能力。由杨氏模量量化。高刚度＝受载时弯曲很小。
Malleability: e : The ability to be hammered or rolled into thin sheets without cracking. Gold is highly malleable. Remember 'malleable = malleable hammering'.
可锻性：材料能被锤打或轧制成薄板而不会开裂的能力。金具有极好的可锻性。联想“可锻＝可锤打”。
Brittleness: The tendency to fracture with little or no plastic deformation. Glass is brittle. 'Brittle breaks suddenly'.
脆性：在极少或没有塑性变形下断裂的趋势。玻璃是脆性的。"脆性＝突然断裂"。
2. Material Classifications | 材料分类
Ferrous metals: Metals containing iron, e.g. steel, cast iron. Often magnetic. 'Ferrous = Fe (iron)'.
黑色金属：含铁的金属，如钢、铸铁。通常有磁性。"Ferrous = Fe（铁）"。
Non-ferrous metals: etals without iron, e.g. aluminium, copper, titanium. They resist rust in a different way. 'Non-ferrous = no iron'.
有色金属：不含铁的金属，如铝、铜、钛。它们以不同方式防锈。"有色金属 = 无铁"。
Alloy: A mixture of two or more elements, at least one being a metal, to improve properties. Brass (Cu+Zn) and stainless steel examples.
合金：两种或以上元素的混合物，至少一种为金属，以提升性能。黄铜（铜+锌）和不锈钢就是合金。
Polymer: A large molecule made of repeating units; can be thermoplastic or thermoset. Plastics are polymers. 'Poly-many, mer-units'.
聚合物：由重复单元构成的大分子；可分为热塑性或热固性。塑料就是聚合物。“Poly-多，mer-单元”。
Thermoplastic: A polymer that softens when heated and hardens when cooled, can be remoulded. Example: polyethylene. 'Thermo-heat, plastic-mouldable'.
热塑性塑料：加热软化、冷却硬化，可重新成型的聚合物。例如聚乙烯。“热=加热，塑料=可塑”。
Thermoset: A polymer that sets permanently when heated; cannot be remoulded. Example: epoxy resin. 'Set for good'.
热固性塑料：加热后永久固化，不能再次成型的聚合物。如环氧树脂。“固化后永久定型”。
Ceramic: Inorganic, non-metallic solid, often hard and brittle, resistant to high temperatures. Porcelain and glass are ceramics.
陶瓷：无机非金属固体，通常硬而脆，耐高温。瓷器和玻璃属于陶瓷。
Composite: Two or more distinct materials combined to achieve better properties, e.g. carbon fibre reinforced polymer. 'Best of both worlds'.
复合材料：两种或多种不同材料组合以获得更优性能，如碳纤维增强聚合物。“取长补短”。
Smart material: A material that responds to external stimuli (temperature, stress, electric field) in a controlled way, e.g. shape memory alloys.
智能材料：能对外界刺激（温度、应力、电场）作出可控响应的材料，例如形状记忆合金。
3. The Stress–Strain Curve | 应力–应变曲线
σ = F / A
Stress (σ): nit area. Unit: Pascal (Pa). When force acts, stress develops inside the material. Picture 'stress = pressure inside'.
应力 (σ)：单位面积上的内力。单位：帕斯卡 (Pa)。当外力作用时，内部产生应力。想象“应力＝内部压强”。
ε = ΔL / L₀
Strain (ε): Extension per unit original length; it is dimensionless. 'Strain = how much it stretches proportionally'.
应变 (ε)：单位原始长度的伸长量；无量纲。“应变＝被拉伸的比例”。
Hooke's Law: Up to the limit of proportionality, stress is directly proportional to strain. σ ∝ ε or σ = E ε. This linear region is the elastic zone.
胡克定律：在比例极限内，应力与应变成正比。σ ∝ ε 或 σ = E ε。这个线性区域是弹性区。
E = σ / ε (Young's modulus)
Young's modulus (E): A measure of stiffness; gradient of the stress-strain curve in the linear elastic region. 'E = how easy to stretch? Higher E = stiffer material'.
杨氏模量 (E)：衡量刚度的量；线性弹性区内应力-应变曲线的斜率。“E越高，材料越刚硬”。
Elastic limit: The maximum stress a material can withstand and still return to its original shape upon unloading. Beyond this point, permanent deformation occurs.
弹性极限：材料能承受并仍可完全复原的最大应力。超过此点便产生永久变形。
Yield point: h : The point after which plastic deformation starts; often observed as a sudden drop in stress in some materials. 'Yielding = giving way'.
屈服点：塑性变形开始的点；某些材料会观察到应力突然下降。“屈服＝让步”。
Ultimate tensile strength (UTS): The maximum stress on the curve; the highest load divided by original cross-sectional area. After UTS, necking begins.
极限抗拉强度 (UTS)：曲线上的最大应力；最大载荷除以原始截面积。达到UTS后，缩颈开始。
Necking: Localised reduction in cross-sectional area before fracture. Ductile materials show necking; brittle materials do not.
缩颈：断裂前截面面积的局部缩减。延性材料表现出缩颈，脆性材料无此现象。
4. Manufacturing Processes | 制造工艺
Casting: Pouring molten metal into a mould and letting it solidify. Ideal for complex shapes. 'Cast = pour into mould'.
铸造：将熔融金属倒入模具中使其凝固。适合复杂形状。“铸造＝倒入模具”。
Forging: Shaping metal using compressive forces, often hot. Improves strength by grain refinement. 'Forging = hammering into shape'.
锻造：利用压应力使金属成形，通常加热。通过晶粒细化提高强度。“锻造＝锤打成形”。
Rolling: Passing metal stock between rollers to reduce thickness and produce plates, sheets, or structural sections. 'Rolling flattens'.
轧制：将金属坯料通过轧辊之间以减薄厚度，生产板材或型材。“轧制=压薄”。
Extrusion: Forcing material through a die to create a long product with a constant cross-section, like aluminium window frames.
挤压：将材料推过模具以产生恒定截面长件，如铝窗框。像挤牙膏一样成形。
Drawing: erial through a die to reduce cross-section and increase length; used for wire and tubing. 'Drawing = pulling through a hole'.
拉拔：拉拽材料通过模具以减小截面并增加长度；用于丝材和管材。“拉拔=穿过孔洞牵引”。
Machining: erial from a workpiece using cutting tools; includes turning, milling, drilling, grinding. 'Machine = cut away'.
机加工：使用切削工具从工件上去除材料；包括车削、铣削、钻孔、磨削。“机加工=切削去除”。
Turning: A machining process where the workpiece rotates and a single-point cutting tool removes material. Produces cylindrical parts.
车削：工件旋转，单刃车刀去除材料的机加工方式。用于制造圆柱形零件。
Milling: Using a rotating multi-tooth cutter to remove material; can create flat surfaces, slots, and complex profiles.
铣削：使用旋转多刃刀具切除材料；可加工平面、槽和复杂轮廓。
5. Joining Methods | 连接方法
Welding: f metal by melting the joint, often with a filler rod. Produces a strong, continuous bond. 'Weld = melt together'.
焊接：通过熔化接头使两块金属熔合，常加焊条。形成坚固连续连接。“焊接=熔化在一起”。
Brazing: ng : Joining metals using a filler metal with a melting point above 450 °C but below the base metals' melting points. Capillary action pulls filler into the joint. 'Braze = high-temp glue'.
钎焊：使用熔点高于450°C但低于母材熔点的填充金属进行连接。毛细作用将填充金属吸入接头。“钎焊=高温胶水”。
Soldering: Similar to brazing but at temperatures below 450 °C; used for electronics and sheet metal. 'Solder = low-temp join'.
软钎焊：类似于钎焊但在450°C以下进行；用于电子和薄板。“软钎焊=低温连接”。
Adhesive bonding: Using a glue or resin to hold components together. Distributes stress uniformly; examples: epoxy, cyanoacrylate. 'Stick it'.
粘接：用胶水或树脂将部件固定在一起。应力分布均匀；如环氧树脂、氰基丙烯酸酯。“粘接=贴住”。
Mechanical fasteners: Bolts, nuts, screws, rivets. Create detachable or permanent joints by physical clamping. 'Fastener = mechanical grip'.
机械紧固件：螺栓、螺母、螺钉、铆钉。通过物理夹紧实现可拆卸或永久连接。“紧固件=机械抓紧”。
Riveting: t fastening method where a rivet is deformed to create a second head. Common in aerospace. 'Rivet = metal pin, flattened'.
铆接：一种永久紧固方法，铆钉变形形成第二个头。常用于航空航天。“铆钉=钉平”。
6. Failure Modes | 失效模式
Fatigue: ctuating stress, often at a stress lower than UTS. Forms cracks that grow with each cycle. 'Fatigue = tired metal cracks'.
疲劳：在重复或交变应力下发生失效，应力常低于UTS。裂纹随每个循环扩展。“疲劳=金属累出裂纹”。
Creep: eformation under constant load at high temperature over time. Turbine blades suffer creep. 'Creep = gradual stretch when hot'.
蠕变：在高温恒定载荷下随时间发生的缓慢永久变形。涡轮叶片会蠕变。“蠕变=受热慢慢拉长”。
Corrosion: l : Deterioration of metal due to chemical or electrochemical reaction with its environment, e.g., rusting of iron. 'Corrode = eaten away'.
腐蚀：金属与环境发生化学或电化学反应而劣化，例如铁锈。“腐蚀=被吃掉”。
Wear: radual removal of material from a surface by mechanical action, like abrasion or adhesion. 'Wear = rubbed away'.
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