摘要
应用弹塑性有限元方法,研究压应力对长短疲劳裂纹塑性区的影响。分别建立两个具有长短中心穿透裂纹高强铝合金板的有限元模型,进行拉压加载模拟分析。结果表明,压应力对长短疲劳裂纹尖端塑性区有显著影响,相同的应力强度因子条件下,在一个拉-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应力的增加而增加,压应力的大小是决定裂纹尖端塑性区大小的主要因素,压应力对短裂纹的影响比长裂纹大。
In this paper, a detailed elastic-plastic finite element analysis of the effect of the compressive loading on eraek tip plaslieity 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 erack tip reverse plastic zone increases with the increase of the eompressive 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5期126-127,共2页
Mechanical Engineer
基金
黑龙江省教育厅科学技术研究项目(11511073)
关键词
有限元
疲劳裂纹
压应力
塑性区
应力强度因子
finite element analysis
fatigue crack
compressive loading
plastic zone
stress intensity factor
