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高循环载荷叠加低循环载荷是航空发动机及多数动力机械构件的工作条件。材料科学工作者和冶金工程师近年来十分重视工程材料在接近构件工作条件下的疲劳断裂行为研究,主要有三个方面的原因.(1)愈来愈多的研究结果表明,开展金属材料接近构件工作条件下疲劳行为研究,是对材料及其工艺应用研究在技术上的促进。(2)为了运用金属材料疲劳断裂机理方面的基础理论来发展具有良好疲劳性能的合金,必须进行疲劳损伤、裂纹起始和扩展各个阶段机理的基础研究,当前这些基础性研究的方向.也是发展接近构件工作条件下的动态力学行为研究。(3)研究
High cycle load superimposed Low cycle load is the working condition of aeroengine and most power machinery components. In recent years, materials science workers and metallurgical engineers have paid great attention to the fatigue fracture behavior of engineering materials under the working conditions of approaching components, for three main reasons. (1) More and more research results show that the work of approaching components of metal materials Under the conditions of fatigue behavior, is the application of materials and technology in the technical promotion. (2) In order to develop the alloy with good fatigue performance by using the basic theory of the fatigue fracture mechanism of metal materials, basic research on the mechanism of fatigue damage, crack initiation and propagation at various stages, the direction of these basic research, and the development Dynamic Mechanical Behavior of Proximity Members under Working Conditions. (3) research