基于DFR法的工程结构振动疲劳寿命评定

Vibration Fatigue Life Prediction of Engineering Structures Based on DFR Method

以某含铸造缺陷的设备结构为对象,通过样件的基本力学性能及疲劳/裂纹扩展性能测试、模态及动力响应测试、动力响应分析及危险部位载荷谱确定等工作,采用细节疲劳寿命额定值(DFR)方法获取了该批次缺陷件疲劳寿命。研究结果可为工作在振动环境下的工程结构疲劳寿命评定探索出一条合理可行的解决途径。

An equipment structure with foundry defects was studied herein to acquire the fatigue life based on the DFR method. The data employed in the method were obtained from a series of tests, which were basic mechanical properties, fatigue/crack propagation performance, mode/dynamic re- sponse performance, load spectrum of critical site, etc. It is proved that this method provides a reasona- ble and feasible approach to assess fatigue life of engineering structure under the broad band random vibration environment.