Composites Material
- Composite materials are new types of materials formed by combining several different types of materials, such as organic polymers, inorganic non-metals, or metals, through composite processes. They can retain the main characteristics of the original component materials while obtaining properties that the original components do not possess through composite effects. Through material design, the properties of each component can be made to complement each other and be interrelated, thereby obtaining new superior properties, which is essentially different from the simple mixing of general materials.
- 复合材料是由有机高分子、无机非金属或金属等几类不同材料通过复合工艺组合而成的新型材料，它既能保留原组分材料 的主要特色，又通过复合效应获得原组分所不具备的性能。可以通过材料设计使各组分的性能互相补充并彼此关联，从而获 得新的优越性能，与一般材料的简单混合有本质的区别。
Case
- In blade design, wind aerodynamic calculations and structural mechanical calculations must be carried out. The blade shape is determined through aerodynamic design, and its dimensions are relatively complex, with high requirements for its dimensions, surface finish, and mass distribution. The structural form of the blade is determined through structural mechanical calculations, with common forms being hollow thin-walled structures with reinforcing ribs and thin-walled foam sandwich structures. A reasonable structure must be determined to prevent instability or local deformation when subjected to centrifugal force, bending moment, and torque loads.
- 叶片设计中要进行风力空气动力学计算和结构力学计算。叶片的外形是通过空气动力学设计确定的，尺寸较复杂，而且其尺 寸、表面光洁度以及质量分布等都有较高要求。叶片的结构形式是通过结构力学计算确定的，常见形式为设有加强筋的空腹薄 壁和薄壁泡沫塑料夹芯结构。确定合理的结构，以防止在受载离心力、弯矩和扭矩时失稳或局部变形。
- A mode is the inherent vibration characteristic of a mechanical structure. Each mode has a specific natural frequency, damping ratio, and mode shape. These modal parameters can be obtained by calculation or experimental analysis. Such a calculation or experimental analysis process is called modal analysis. Based on modal analysis of the aircraft under its natural state, the first-order frequency value and corresponding mode shape of the aircraft are extracted to avoid the resonance frequency of the aircraft engine and solve the aircraft resonance problem.
- 模态是机械结构的固有振动特性，每一个模态具有特定的固有频率、阻尼比和模态振型。这些模态参数可以由 计算或试验分 析取得，这样一个计算或试验分析过程称为模态分析。在根据自然状态下飞机的模态分析，提飞机 的一阶频率值及相应模态振 型，避开飞机引擎的共振频率，解决飞机的共振问题。
- For the engine hood structure of a certain vehicle model, without changing the geometric shape, the method of replacing the material of the engine outer hood panel was adopted. Finite element simulations of pedestrian head impact were carried out for an ordinary steel engine hood and an automated fiber placement composite engine hood, and the energy absorption characteristics of engine hood structures with different materials under pedestrian head impact were studied. Replacing traditional steel materials with composite materials can achieve a 39% weight reduction of the engine hood.
- 针对某车型的发动机罩板结构，在不改变几何外形的前提下采用替换发动机外罩板材料的方法，进行了普通钢板发动机罩盖 和自动铺丝复合材料发动机罩盖行人头冲击有限元模拟，研究了不同材料发动机罩板结构在行人头冲击下的吸能特性。采用复 合材料替换传统钢板材料可实现发动机罩盖减重39%。
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