摘要
论述了共振疲劳与强迫振动疲劳的差异，强调了共振疲劳与结构的动态特性的关系。从位移模态推导了应变模态的表达式；讨论了利用应变模态分析的结果确定共振疲劳危险点位置原理和利用已知点应变时间历程确定危险点应变时间历程的方法。并讨论了利用动力修改技术避免共振疲劳的原理，最后以悬臂梁为模型进行了试验应变模态分析及疲劳试验，将悬臂梁的实际疲劳寿命与估计寿命进行了对比。
A method of improving lifetime prediction for resonant fatigue using strainmodal test results is presented.The difference between the resonant fatigue and forcedfatigue is discussed. The principle of using strain modals to locate the position of max-ium strain point in the structure and to determine the maxium strain time history basedon other measured data is described.Furthermore, the technique by meams of structuredynamic modificatiom to reduce strain response is discussed.Strain modal test and fatiguetest are carried out for a cantilever beam. Fatigue life prediction is performed using theproposed method.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
1996年第3期52-57,共6页
Journal of Mechanical Engineering
关键词
疲劳寿命
共振
应变
模态分析
Fatigue Lifetime Resonant Strain Modal analysis
