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工程塑料用于制造机械零件,正在逐渐扩大,对性能要求较高的零件,往往采用纤维增强塑料。在设计中安全应力的确定,对金属或钢件均有现成数据资料,因此比较容易确定,但纤维增强塑料就不同了,它与材料性能与使用环境均有很大影响,而疲劳性能是其最大差别,金属材料如钢或铝合金等的老化时间极长,使用耐久,而纤维增强塑料中混杂有增强纤维及基料互相作用着,其使用环境与应力状态对寿命影响很大。如图1和5所示。复杂的是温度,湿度的变化及其他因素均能影响聚合物基料,在设计纤维增强塑料件比金属件要多考虑这些因素。然而这些材料价格低,重量轻,用它来设计运输机械,气动设备,均
Engineering plastics for the manufacture of mechanical parts, is gradually expanding, for the performance of the higher parts, often using fiber-reinforced plastic. In the design of the safety of the determination of the metal or steel pieces are readily available data, it is relatively easy to determine, but the fiber reinforced plastic is different, it has a great impact on material properties and the use of the environment, and fatigue performance is its The biggest difference is the extremely long aging time of metallic materials such as steel or aluminum alloy, which are durable. However, the reinforcing fibers and the base material are mixed with each other in the fiber-reinforced plastic. The service environment and the stress state greatly affect the service life. As shown in Figures 1 and 5. Complicated is the temperature, humidity changes and other factors can affect the polymer binder, in the design of fiber reinforced plastic parts than metal parts to consider these factors. However, these materials are of low cost and light weight. They are used to design transportation machinery, pneumatic equipment,