论文部分内容阅读
振动疲劳试验作为材料力学性能和构件实物模拟的一种测试手段,在苏、美、德、日等国早已开展。实践证明,航空发动机压气机和涡轮叶片的损坏,一般不是由于准稳态应力或蠕变断裂引起,尤其在高性能燃气涡轮中,而其振动疲劳损伤却一直是发动机研制、改型和使用中密切关注的问题。一台轴流式发动机中约有2000个叶片,其中任何一个破坏都可能导致空中停车或非定期更换。业已证明,实验室条件下的振动疲劳试验,能够近似地模拟叶片的使用状态,并再现故障的断裂特征。
Vibration fatigue test as a material mechanical properties and components of a physical simulation of a test means in the Soviet Union, the United States, Germany, Japan and other countries have already started. Practice has proved that the damage of aeroengine compressors and turbine blades is generally not caused by quasi-steady state stress or creep rupture, especially in high-performance gas turbines, while its vibrational fatigue damage has been the development, modification and use of engines Closely concerned about the issue. An axial-flow engine has approximately 2,000 blades, any of which may cause airborne parking or unscheduled replacement. It has been demonstrated that vibration fatigue testing under laboratory conditions can approximately simulate the state of use of the blade and reproduce the fracture characteristics of the fault.