Modeling of crack growth through particulate clusters in brittle matrix by symmetric-Galerkin boundary element method
Modeling of crack growth through particulate clusters in brittle matrix by symmetric-Galerkin boundary element method
复制标题
DOI：
10.1007/s10704-006-0047-x
复制
发表时间：
2006
影响因子：
2.5
通讯作者：
R. Kitey;A. Phan;H. Tippur;T. Kaplan
中科院分区：
文献类型：
--
作者：
R. Kitey;A. Phan;H. Tippur;T. Kaplan
用数值模拟方法研究了裂纹与脆性基体中刚性孤立夹杂和夹杂群的相互作用。特别令人感兴趣的是夹杂物的作用裂纹路径，应力强度因子（SIF）和能量释放率与颗粒复合材料的断裂行为的潜在影响。首先研究相对于初始裂纹取向的颗粒尺寸和偏心率的影响，作为颗粒簇研究的先驱。模拟完成使用一个新的准静态裂纹扩展预测工具的基础上的Drachic-Galerkin边界元法，一个修改的四分之一点裂纹尖端元素，位移相关技术评估应力强度因子，和裂纹扩展方向预测的最大主应力准则。数值模拟表明，复杂的相互作用的裂纹尖端屏蔽和放大机制，导致显着增韧的材料。
The interaction of a crack with perfectly bonded rigid isolated inclusions and clusters of inclusions in a brittle matrix is investigated using numerical simulations. Of particular interest is the role inclusions play on crack paths, stress intensity factors (SIFs) and the energy release rates with potential implications to the fracture behavior of particulate composites. The effects of particle size and eccentricity relative to the initial crack orientation are examined first as a precursor to the study of particle clusters. Simulations are accomplished using a new quasi-static crack-growth prediction tool based on the symmetric-Galerkin boundary element method, a modified quarter-point crack-tip element, the displacement correlation technique for evaluating SIFs, and the maximum principal stress criterion for crack-growth direction prediction. The numerical simulations demonstrate a complex interplay of crack-tip shielding and amplification mechanisms leading to significant toughening of the material.