疲劳寿命计疲劳响应模型研究

Study on fatigue response model for fatigue life gauge

对疲劳寿命计恒幅加载的响应性能进行了全域实验研究,得到疲劳响应的电阻变化标定数据曲线.在此基础上,根据电阻变化等效方法,建立了任意循环加载下疲劳响应的数学计算模型,并给出了任意加载下电阻响应误差的全域统计分布函数.通过多级加载实验对计算模型进行验证,说明此计算方法能准确预测电阻变化量.

A full-range experimental study is performed on the response performance of the fatigue life gauge under constant load increments, and the calibration curve of resistance variation in response to fatigue is obtained. Based on the equivalent resistance variation method, a mathematical model for fatigue response under random cyclic loading is developed, and the function of the full-range statistical distribution of resistance response error is also given under random loading. Finally, multistage loading experiments are performed to verify the model, and the result shows that the calculating method can predict the variation of resistance accurately.