摘要
为了研究孔洞位置和尺寸对疲劳裂纹扩展路径的影响,利用ABAQUS有限元仿真软件建立改进CT试样的裂纹扩展仿真模型,采用扩展有限元法研究了在低周疲劳加载条件下Q235钢圆孔与裂纹尖端的角度、距离以及圆孔半径对裂纹扩展路径的影响,并通过引入裂纹偏转系数来定量描述不同参数对裂纹扩展路径偏转程度的影响。结果表明:当圆孔与裂纹尖端的夹角为45°时,裂纹偏转系数取得最大值;裂纹偏转系数随着孔洞半径的增加逐渐增大,随着圆孔与裂纹尖端距离的增大逐渐减小。
In order to study the influence of hole location and size on fatigue crack propagation path,ABAQUS finite element simulation software was used to establish the simulation model of crack propagation for modified CT samples.By using the extended finite element method(XFEM),the influence of the angle and distance between the circular hole and the crack tip as well as the radius of circular hole on the crack propagation path of Q235 steel under low cycle fatigue was studied.By introducing the crack deflection coefficient,the influence of different parameters on the deflection degree of crack propagation path was described quantitatively.The results show that the crack deflection coefficient reaches the maximum value when the angle between the crack tip and the circular hole is 45°.The crack deflection coefficient increases with the increase of hole radius,while decreases with the increase of the distance between circular hole and crack tip.
作者
郑文涛
陈晶华
李田
ZHENG Wentao;CHEN Jinghua;LI Tian(School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,Liaoning,China;State Grid Tianjin Electric Power Research Institute,Tianjin 300220,China)
出处
《沈阳工业大学学报》
CAS
北大核心
2024年第2期177-183,共7页
Journal of Shenyang University of Technology
基金
国家自然科学基金面上项目(51875365)。
关键词
孔洞
裂纹扩展
低周疲劳
裂纹偏转行为
扩展有限元法
裂纹尖端应力场
仿真模拟
裂纹偏转系数
hole
crack propogation
low cycle fatigue
crack deflection behavior
extended finite element method
stress field at crack tip
simulation
crack deflection coefficient
