摘要
应用弹塑性有限元方法,研究不同加载条件下压载荷对疲劳裂纹尖端塑性区的影响。建立两个具有中心穿透裂纹的高强铝合金板的有限元模型,分别进行不同载荷的拉压加载模拟分析。结果表明,压载荷对疲劳裂纹尖端塑性区有显著影响,在一拉-压加载周期,当拉载荷减小到零时裂纹尖端应力不为零,裂纹尖端应力对裂尖的挤压作用产生反向塑性区,裂尖反向塑性区随压载荷的增加而增加,压载荷的大小是决定裂纹尖端塑性区大小的主要因素,压载荷越大塑性区越大。
In this paper, a detailed elastic-plastic finite element analysis of the effect of the different compressive loading on crack tip plasticity is studied. Two centre-cracked panel specimens are analyzed. The analysis shows that the compressive loading has a significant contribution towards the crack tip plasticity and. In a tension-compression loading the maximum spread of the crack tip reverse plastic zone increases with the increase of the compressive stress and the crack tip compress stress increases with the increase of the compressive stress. The applied compressive stress is the main factor controlling the near crack tip parameters.
出处
《机械工程师》
2008年第4期88-89,共2页
Mechanical Engineer
基金
黑龙江省自然科学基金资助项目(zjg04-05)
关键词
有限元
疲劳裂纹
压载荷
finite element analysis
fatigue crack
compressive loading
