摘要
通过对正火４５钢的试验数据分析，提出了一个反映剩余强度退化的对数表达式，给出对称恒幅应力循环下疲劳损伤的定义与表达式。该表达式能够反映损伤演化的非线性特性。进一步分析了随机应力循环下结构的疲劳损伤，导出损伤演化的递推公式，并结合大量的计算给出结构在应力块重复循环下疲劳寿命估算的一个近似方法。
Firstly, according to analyze the fatigue test result of the normalized carbon steel, a logarithmic expression is developed to describe residual strength degradation process, the definition and expression of fatigue damage under symmetrical she with constant amplitude are also given, and the expression 'can explain the non-linear property of fatigue damage. Secondly, the fatigue damage of structures under random stress is analyzed, ed an iterative formula to describe the fatigUe damage process is deduced. At last, an approximate method for evaluate fatigue life of structures under repeat random stress block is presented through a lot of calculation examples.
出处
《机械强度》
CAS
CSCD
北大核心
2000年第3期238-240,共3页
Journal of Mechanical Strength
基金
国家自然科学基金!(59475007)
教委留学回国人员基金资助项目
