摘要
以冷挤压孔三维裂纹为讨论对象,应用ANSYS大型工程有限元计算软件,在线弹性条件下,模拟由于干涉产生的预应力释放的真实过程,研究预应力释放对裂纹尖端应力强度因子的影响规律。文中将干涉预应力考虑为内部载荷,分别对不同裂纹长度下的含裂纹体进行挤压,在不同的挤压状态下直接求解应力强度因子,以此等效地模拟裂纹扩展过程中干涉预应力释放的应力强度因子求解。文中通过计算分析,给出了考虑干涉预应力释放的真实情况下裂纹尖端的应力强度因子随裂纹长度及模型厚度的改变趋势和规律,并与不考虑干涉预应力释放的情况下裂纹尖端的应力强度因子进行对比分析。
We discuss the 3D cracks around cold-expanded holes and simulate their interference prestress release using the engineering software of ANSYS to study the effect of the interference prestress release on stress intensity factors （SIFs） at crack tips. We regard interference prestress as inner load and extrude crack-containing bodies that have different crack lengths. Then we calculate SIFs under different extrusion states so as to simulate equivalently the SIFs of interference prestress release during crack growth. Through computational analysis, we present some results on SIFs at crack tips, considering the changes of interference prestress release with those of crack models. Moreover, we conduct the contrastive analysis of the SIFs at crack tips without considering interference prestress release.
出处
《机械科学与技术》
CSCD
北大核心
2007年第10期1341-1344,共4页
Mechanical Science and Technology for Aerospace Engineering
关键词
冷挤压孔
三维裂纹
干涉预应力释放
应力强度因子
cold-expanded hole
3D crack
interference prestress release
stress intensity factor（SIF）
