双材料界面裂纹动态应力强度因子有限元分析  

Finite Element Analysis of Dynamic Stress Intensity Factor for Bimaterial Interface Cracks

作　　者：马振洲 王小乐 刘恩欣 杨文坡 MA Zhenzhou;WANG Xiaole;LIU Enxin;YANG Wenpo(Hebei Bohai Investment Group Co.,Ltd.,Cangzhou,Hebei 061113,China;Changguo Town Government of Huanghua City,Cangzhou,Hebei 061112,China)

机构地区：[1]河北渤海投资集团有限公司,河北沧州061113 [2]黄骅市常郭镇政府,河北沧州061112

出　　处：《水利与建筑工程学报》2019年第2期101-104,共4页Journal of Water Resources and Architectural Engineering

摘　　要：为研究界面裂纹动态应力强度因子在冲击荷载作用下的变化规律,利用双材料界面理论,推导出界面裂纹尖端的应力强度因子表达式。采用ANSYS有限元软件,对由不同材料组合而成的四点剪切复合试样进行动态响应分析,发现张开型应力强度因子K_1随着模态角的增加而减小,剪切型应力强度因子K_2的绝对值则随着模态角的增加而增大,且变化趋势较张开型应力强度因子K_1更复杂。进而将该理论运用到均质三点弯曲试样的动态响应分析中,发现通过有限元计算得到冲击荷载下的动态应力强度因子具有较高的精度。To study the variation of dynamic stress intensity factor of interface crack under impact loading,based on the theory of bimaterial interface mechanics,the expression of stress intensity factor at interface crack tip is deduced.The dynamic response of the four-point shear composite specimen under different modes is obtained by ANSYS finite element software.It is found that the open-type stress intensity factor K1 decreases with the increase of the modal angle,while the absolute value of the shear-type stress intensity factor K2 increases with the increase of the modal angle,and the trend of the shear stress intensity factor K2 is more complicated than the open dynamic stress intensity factor K1.The theory is applied to the dynamic response analysis of the homogeneous three-point bending specimen,that is,the same material parameters are given on both sides of the crack.The results show that the dynamic stress intensity factor under the impact loading obtained by the finite element method has a high accuracy.

关 键 词：双材料界面理论 动态应力强度因子 冲击荷载 四点剪切复合试样 模态角 三点弯曲试样 

分 类 号：O346.1[理学—固体力学]