摘要
钢结构的疲劳破坏时有发生,实际构件中难免存在几何突变,导致应力集中、降低构件疲劳强度,因此如何有效预估变截面构件的疲劳寿命尤为重要。基于损伤力学理论建立的疲劳损伤模型被用来预估构件疲劳寿命,且取得很好的效果。基于疲劳损伤模型预估缺口试件的疲劳寿命,利用封闭解的方法给出了缺口构件在拉压载荷下的损伤演化方程,同时计算了不同应力集中系数下缺口试件的疲劳寿命,将利用提出方法计算的结果与利用Manson-Coffin方程计算结果进行对比分析,其结果误差在5%以内。
Fatigue failure often occurs in steel structure, and there is localized discontinuation in the real members, which may lead to stress concentration and lower fatigue strength. Therefore, how to effectively estimate the fatigue life of actual steel structure is particularly important. The fatigue damage model based on damage mechanics theory was proposed to predict fatigue life. In the paper, the fatigue life of notch specimen was predicted based on fatigue damage model, and the damage evolution equation of notch specimen under the tension and compression loading was also deduced by using closed-form solution. It was proved that the proposed model was available and practicable by the comparative analysis of the predicted results with the results calculated by Manson-Coffin law, and the error was within 5%.
出处
《钢结构》
2018年第1期18-22,共5页
Steel Construction
基金
国家自然科学面上项目(51778273)
关键词
损伤力学
缺口试件
疲劳损伤模型
damage mechanics
notched specimen
fatigue damage model
