Year 12 CAIE Engineering: Core Knowledge Review | Year 12 CAIE 工程：核心知识点梳理

📚 Year 12 CAIE Engineering: Core Knowledge Review | Year 12 CAIE 工程：核心知识点梳理

This article provides a comprehensive review of the key topics covered in the Year 12 CAIE Engineering syllabus, including materials science, mechanics, energy, electrical principles, and design. Understanding these core concepts is essential for success in AS Level Engineering and builds a solid foundation for further study.

本文全面回顾了 Year 12 CAIE 工程课程大纲中的核心主题，包括材料科学、力学、能量、电子原理和设计。理解这些基础概念对于 AS 阶段工程学科的成功至关重要，并为后续学习奠定坚实基础。

1. Materials Classification | 材料分类

In engineering, materials are typically grouped into metals, polymers, ceramics, and composites. Metals are further classified as ferrous (containing iron) and non-ferrous (e.g., aluminium, copper).

在工程中，材料通常分为金属、聚合物、陶瓷和复合材料。金属可进一步分为含铁金属（含铁）和非铁金属（如铝、铜）。

Ferrous metals like mild steel and cast iron are widely used for structural applications due to their strength and low cost, but they are prone to corrosion. Non-ferrous metals offer better corrosion resistance and are lighter, making them suitable for aerospace and electrical uses.

低碳钢和铸铁等含铁金属因其强度高、成本低广泛用于结构应用，但容易腐蚀。非铁金属具有更好的耐腐蚀性和更轻的重量，适用于航空航天和电气用途。

Polymers, or plastics, can be thermoplastics (which soften on heating) or thermosets (which do not soften once set). Ceramics are hard, brittle, and heat-resistant, while composites like carbon fibre reinforced polymer combine materials to achieve superior properties.

聚合物，或称塑料，可分为热塑性塑料（加热会软化）和热固性塑料（一旦定型不再软化）。陶瓷硬而脆但耐热，而碳纤维增强聚合物等复合材料结合不同材料以获得优越性能。

2. Mechanical Properties and Testing | 力学性能与测试

Mechanical properties describe how a material responds to applied forces. Key properties include strength, hardness, ductility, toughness, elasticity, and stiffness.

力学性能描述材料在受力时的响应。关键性能包括强度、硬度、延展性、韧性、弹性和刚度。

Tensile testing is the most common method to evaluate these properties. A specimen is pulled until fracture, and a stress–strain curve is plotted. Important values like yield strength, ultimate tensile strength (UTS), and percentage elongation can be determined.

拉伸试验是评估这些性能的最常用方法。试样被拉伸至断裂，并绘制应力-应变曲线。可以确定屈服强度、极限抗拉强度 (UTS) 和延伸率等重要数据。

Hardness tests like Brinell or Vickers measure resistance to indentation, while impact tests (e.g., Charpy) assess toughness. Understanding these properties helps engineers select materials for safe and efficient designs.

布氏或维氏硬度测试测量抵抗压痕的能力，而冲击试验（如夏比冲击试验）评估韧性。理解这些性能有助于工程师选择材料以实现安全高效的设计。

3. Stress, Strain and Young’s Modulus | 应力、应变与杨氏模量

When a force is applied to a material, internal resistance known as stress (σ) is developed. Stress is defined as force per unit area:

当力作用于材料时，内部产生的阻力称为应力 (σ)。应力定义为单位面积上的力：

σ = F / A

where F is the applied force and A is the cross-sectional area. The unit of stress is the pascal (Pa) or N/m².

其中 F 为施加的力，A 为横截面积。

Published by TutorHao | Year 12 工程 Revision Series | aleveler.com

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