| 基于有限元方法的疲劳裂纹闭合行为 |
| |
| 引用本文： | 冯刚,张朝阁,宫大为,韩承江,林克伟,齐继宝.基于有限元方法的疲劳裂纹闭合行为[J].钢铁,2016(5):95-100. |
| |
| 作者姓名： | 冯刚 张朝阁 宫大为 韩承江 林克伟 齐继宝 |
| |
| 作者单位： | 1. 浙江工业职业技术学院机械工程分院，浙江 绍兴 312000; 浙江大学现代制造工程研究所，浙江 杭州 310000;2. 浙江工业职业技术学院机械工程分院,浙江 绍兴,312000;3. 电子科技大学机械电子工程学院,四川 成都,611731 |
| |
| 基金项目： | 国家自然科学基金资助项目(50775206) |
| |
| 摘 要： | 裂纹闭合行为将很大程度改变疲劳裂纹扩展行为。针对316L不锈钢，结合常幅加载和单个拉伸过载试验和动态数值模拟方法，对疲劳裂纹扩展行为中的裂纹闭合现象开展了一系列研究工作。详细对比了不同扩展阶段的裂纹闭合行为随裂纹长度、应力比和过载影响因素的变化，以及对裂纹扩展速率的影响。同时，研究了单个拉伸过载和裂纹闭合行为之间的内在联系和机理。结合裂纹闭合理论和有限元计算结果，等效应力强度因子被用来描述316L不锈钢的裂纹扩展过程，并提出316L不锈钢的裂纹扩展速率的预测模型。
|
| 关 键 词： | 裂纹闭合 过载 应力比 疲劳裂纹扩展 |
Closure behavior of fatigue crack by finite element method |
| |
| Abstract: | The behaviour of fatigue crack growth was significantly changed by the closure behavior of fatigue crack. The crack closure behaviour of 316L stainless steel was investigated by combining the loading test and the numerical simulation to study the dynamic crack propagation. The fatigue crack growth experiment included the constant amplitude loading and single tensile overload. The crack closure behaviour and the crack growth rate in different propagation peri-od were studied with different crack length,stress ratio and overload. The intrinsic mechanisation between the single ten-sile overload and the crack closure was discussed. An improved model to calculate the effective stress intensity factor range was applied based on the theory of crack closure and the calculated results. The prediction formulation of crack growth rate was fitted about the 316L steel. |
| |
| Keywords: | crack closure overload R-ratio fatigue crack growth |
| 本文献已被 万方数据 等数据库收录！ |
|
