摘要
等幅疲劳 P- S- N曲线采用三参数幂函数方程形式 .利用对数疲劳寿命符合正态分布的特性 ,可靠度一定时 ,可借助单侧容限系数给出具有置信度 r的对数疲劳寿命 .通过最小二乘法拟合来确定 P- S- N曲线参数 ,并采用割线法进行迭代求解 .该方法具有迭代收敛快。
An optimization method for fitting the three-parameter equation of constant amplitude P-S-N curve was presented. According to the fatigue logarithm life tallys with normal distribution, once given the reliability, the one-side tolerance factor can be used to solve the fatigue logarithm life with the confidence level r. The parameters of P-S-N curve can be decided by fitting the data with least square method (LSM), then the solution is got using the iterative secant procedure. It is shown that this new method is accurate as well as fast in convergence.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2002年第11期1583-1586,共4页
Journal of Shanghai Jiaotong University
基金
国家自然科学基金资助项目 (5 960 5 0 10 5 99790 15 )
