📚 AS CAIE Engineering: Key Terminology Memory Guide | AS CAIE 工程：关键术语速记指南
Mastering engineering terminology is essential for success in the AS CAIE Engineering examination. Understanding key terms not only helps in answering theory questions but also builds a solid foundation for practical applications. This guide uses mnemonic devices, visual associations, and straightforward explanations to help you memorize and recall essential vocabulary quickly.
掌握工程术语是通过 AS CAIE 工程考试的关键。理解关键术语不仅有助于解答理论题，还能为实际应用打下坚实基础。本指南运用记忆术、形象联想和简明解释，帮助你快速记忆和回忆核心词汇。
1. Materials and Their Properties | 材料及其性能
Hardness - resistance to indentation or scratching. Think of a hard diamond scratching glass effortlessly.
硬度 - 抵抗压入或划伤的能力。记忆联想：坚硬的钻石可以轻松划伤玻璃。
Toughness - the ability to absorb energy and plastically deform without fracturing. Picture a tough rubber band stretching a long way before it snaps.
韧性 - 材料在断裂前吸收能量并发生塑性变形的能力。想象一根坚韧的橡皮筋，拉得很长才会断。
Ductility - the capacity to be drawn into a wire. The word sounds like 'duck-tile'; picture pulling a duck-shaped piece of metal into a thin wire.
延展性 - 被拉成线材的能力。发音类似 'duck-tile'，想象把鸭形金属拉成细丝。
Brittleness - the tendency to fracture with little plastic deformation, like a matchstick snapping suddenly.
脆性 - 几乎不发生塑性变形就断裂的倾向，如火柴棍突然折断。
Elasticity - the ability to return to original shape after load removal, like a spring. 'E-last-ic' goes back to its last shape.
弹性 - 卸载后恢复原始形状的能力，像弹簧一样。'E-last-ic' 回到最终形状。
Fatigue - failure under repeated or fluctuating stress, often at a stress below the static tensile strength. Think of repeatedly bending a paperclip until it breaks.
疲劳 - 在重复或交变应力下发生的失效，应力常低于静态抗拉强度。想象反复弯折回形针直至其断裂。
Creep - slow, permanent deformation under constant load at high temperature. Creep is like a glacier creeping slowly downhill.
蠕变 - 在高温恒载下发生的缓慢永久变形，如同冰川缓缓向下滑动。
Stiffness - resistance to elastic deformation, measured by Young's modulus. A stiff material bends very little; think 'stiff neck'.
刚度 - 抵抗弹性变形的能力，由杨氏模量衡量。刚硬的材料弯曲很小，想想 'stiff neck'。
2. Stress and Strain | 应力与应变
Stress (σ) - internal force per unit area. Formula: σ = F / A₀. Think of stress as the 'pressure' inside the material.
应力 (σ) - 单位面积上的内力。公式：σ = F / A₀。把应力想象成材料内部的 '压强'。
(ε) - the extension per unit length. ε = ΔL / L₀. Strain has no units; it is just a ratio.
应变 (ε) - 单位长度的伸长量。ε = ΔL / L₀。应变无量纲，只是一个比值。
σ = F / A₀, ε = ΔL / L₀, E = σ / ε
Young's modulus (E) - a measure of stiffness; the slope of the elastic part of the stress-strain curve. 'E is steep, material is stiff'.
杨氏模量 (E) - 刚度的度量；应力-应变曲线弹性段的斜率。'E 陡峭，材料刚硬'。
Yield point - the stress at which a material begins to deform plastically. Visualize a paperclip that stays bent after a certain load.
屈服点 - 材料开始塑性变形的应力。想象回形针受一定力后保持弯曲。
Ultimate tensile strength (UTS) - the maximum stress on the engineering stress-strain curve. After UTS, necking begins.
极限抗拉强度 (UTS) - 工程应力-应变曲线上的最大应力。超过 UTS 后开始出现颈缩。
Necking - localized reduction in cross-sectional area before fracture. Picture a plastic ruler being stretched and forming a narrow neck.
颈缩 - 断裂前截面积局部减小。想象拉伸塑料尺中间形成细颈。
Factor of safety - the ratio of UTS to allowable working stress. 'Factor of safety keeps you away from danger'.
安全系数 - UTS 与许用工作应力之比。'安全系数让你远离危险'。
3. Mechanical Principles and Simple Machines | 机械原理与简单机械
Load - the force or weight to be overcome by a machine, often labelled W.
负载 - 机器需要克服的力或重量，通常标为 W。
Effort - the input force applied to a machine, often labelled P or F.
动力 - 施加在机器上的输入力，通常标为 P 或 F。
rt: MA = Load / Effort. Imagine using a lever: a small effort lifts a big load, so MA > 1.
机械利益 (MA) - 负载与动力的比值：MA = 负载 / 动力。想象用杠杆：小动力举起大负载，MA > 1。
Velocity ratio (VR) - ratio of distance moved by effort to distance moved by load: VR = deffort / dload. VR is fixed by geometry, like pulley number.
速度比 (VR) - 动力移动距离与负载移动距离之比：VR = deffort / dload。VR 由几何决定，例如滑轮数量。
Efficiency - (useful work output / total work input) × 100%. Also equals MA / VR. Efficiency is never 100% due to friction.
效率 - (有用输出功 / 总输入功) × 100%。也等于 MA / VR。由于摩擦，效率永远达不到 100%。
Lever classes - class 1: fulcrum between effort and load (seesaw); class 2: load between fulcrum and effort (wheelbarrow); class 3: effort between fulcrum and load (tweezers). Remember 'FLE' 1-2-3: Fulcrum, Load, Effort - the middle one tells the class.
杠杆类别 - 一类：支点在动力与负载之间（跷跷板）；二类：负载在支点与动力之间（手推车）；三类：动力在支点与负载之间（镊子）。记 'FLE' 1-2-3：中间的那个决定了类别。
4. Manufacturing Processes | 制造工艺
Casting - pouring molten metal into a mould. The word 'cast' brings a fishing cast - throwing liquid metal into shape.
铸造 - 将熔融金属浇入模具。'cast' 让人联想到投钓线，将液态金属投入成形。
Forging - shaping metal by compressive forces, often when hot. Think of a blacksmith hammering a sword; forging makes grains aligned and stronger.
锻造 - 通过压力使金属成形，通常在热态下进行。想象铁匠锤打一柄剑；锻造使晶粒取向并增强强度。
Rolling - passing metal between rollers to reduce thickness. Like rolling dough with a rolling pin; hot rolling or cold rolling.
轧制 - 使金属通过轧辊以减小厚度。如同用擀面杖擀面团；分为热轧和冷轧。
Extrusion - forcing material through a die to create a constant cross-section, like squeezing toothpaste from a tube. Aluminium window frames are extruded.
挤压 - 迫使材料通过模具形成恒定截面，如同挤牙膏。铝合金窗框就是挤压成形的。
Drawing - pulling metal through a die to reduce diameter - think of pulling wire to make it thinner. The wire goes from 'die' to 'duh-lighter'.
拉拔 - 将金属拉过模具以减小直径，想象拉丝变细。线材从 'die' 中拉出。
Turning - machining on a lathe where the workpiece rotates and a cutting tool moves. The workpiece 'turns' around.
车削 - 在车床上加工，工件旋转而刀具移动进给。工件不停地 'turning'。
Milling - a rotating multi-tooth cutter removes material; the workpiece is usually stationary. Think of a milling cutter chewing away metal like a hamster.
铣削 - 旋转的多齿刀具切削材料；工件通常不动。想象铣刀像仓鼠一样啃掉金属。
5. Engineering Drawings and Symbols | 工程图纸与符号
Orthographic projection - a 2D representation of a 3D object using multiple views (front, top, side). 'Ortho' means straight; projector lines are parallel.
正投影 - 用多个视图（正视图、俯视图、侧视图）以二维方式表现三维物体。'Ortho' 意为直线，投影线平行。
First angle projection - the object is placed between the observer and the planes. Used mainly in Europe; the top view appears below the front view.
第一角投影法 - 物体位于观察者与投影平面之间。主要用于欧洲；俯视图在正视图下方。
Third angle projection - the planes are placed between observer and object. Used in the US; top view above front view. Remember: "Third tops the front!"
第三角投影法 - 投影平面位于观察者与物体之间。用于美国；俯视图在正视图上方。记忆："Third tops the front!"
Isometric projection - a 3D view with axes 120° apart, true lengths scaled by about 82%. Instead, isometric drawing uses full scale. Think 'equal measure'.
等轴测投影 - 轴间角 120° 的三维视图，实际长度缩短约 82%。等轴测图则用全尺寸。'iso' = 相等。
Sectional view - a cut-away view showing internal features. Hatching lines indicate solid material; different patterns for different materials.
剖视图 - 展现内部特征的切开视图。剖面线表示实体材料；不同材料用不同图案。
Surface finish symbol - a check-mark symbol with a number indicating roughness Ra in micrometres. Think of a tiny mountain-peak height (the Rₐ value).
表面粗糙度符号 - 一个对勾形状的符号，数字表示粗糙度 Ra (微米)。想象微小山峰的高度 (Ra 值)。
6. Tolerances and Fits | 公差与配合
Basic size - the nominal dimension from which limits are derived, e.g. 40 mm.
基本尺寸 - 导出极限尺寸的标称尺寸，如 40 mm。
Limits - the maximum and minimum permissible sizes: upper limit and lower limit.
极限尺寸 - 允许的最大与最小尺寸：上极限与下极限。
Tolerance - the difference between upper and lower limits. A smaller tolerance means higher precision, but higher cost.
公差 - 上极限与下极限之差。公差越小精度越高，但成本也越高。
Allowance - intentional difference between mating part dimensions (minimum clearance or maximum interference) to achieve the desired fit.
允许偏差 - 配合零件尺寸间有计划设定的差值（最小间隙或最大过盈），以获得预期配合。
Clearance fit - the hole is always larger than the shaft, allowing free movement. 'Clearance' means there's a gap, like a door hinge pin.
间隙配合 - 孔始终大于轴，允许自由运动。'Clearance' 表示有间隙，如门铰链销。
Interference fit - the shaft is larger than the hole, requiring force to assemble; parts stay tightly locked. Think of a press-fitted bearing.
过盈配合 - 轴大于孔，需压力装配；部件紧密固定。想象压入的轴承。
Transition fit - sometimes clearance, sometimes interference, depending on actual sizes. The fit is in 'transition' between loose and tight.
过渡配合 - 可能为间隙或过盈，取决于实际尺寸。配合处于松与紧之间的 '过渡'。
7. Fasteners and Joints | 紧固件与连接
Bolt - a threaded fastener used with a nut; the joint is clamped via tension in the bolt. 'Bolt and nut' always go together.
螺栓 - 带螺纹的紧固件，与螺母配合使用；通过螺栓张力夹紧连接。'Bolt' 和 'nut' 总是一起出现。
Screw - a threaded fastener that engages directly with a threaded hole or cuts its own thread. The screw 'screws into' the workpiece.
螺钉 - 直接与螺纹孔配合或自攻螺纹的紧固件。螺钉 '拧入' 工件。
Washer - a thin plate placed under a nut or bolt head to distribute load or prevent
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