| 基于非结构化格子法的动态J积分计算 |
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| 引用本文： | 刘铁林,陈海滨,焦鹏程.基于非结构化格子法的动态J积分计算[J].沈阳建筑工程学院学报(自然科学版),2007,23(2):195-198. |
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| 作者姓名： | 刘铁林 陈海滨 焦鹏程 |
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| 作者单位： | 沈阳建筑大学土木工程学院,辽宁沈阳110168 |
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| 摘 要： | 目的针对动态载荷作用下稳态裂纹的线弹性断裂问题,提出一种动态J积分和动态应力强度因子KI的数值计算方法.方法基于非结构化格子法,对动态J积分计算公式中的围线积分和围面积分离散化处理,进行动态J积分的数值计算,利用动态J积分和KI的关系给出动态应力强度因子.结果非结构化格子法不仅能够用于验证动态J积分的路径守恒性,而且能够计算任意时刻动态J积分的具体数值.结论动态J积分算法具有简便、实用、计算速度快和数值计算精度高的特点.该算法可以用于动态应力强度因子的计算,为裂纹的动态起始扩展问题的研究提供了一种新的数值算法.
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| 关 键 词： | 动态J积分 非结构化格子法 三角形格子 离散化 |
| 文章编号： | 1671-2021(2007)01-0195-04 |
| 修稿时间： | 2006年12月26 |
Calculation of Dynamic J Integral Based on Unstructured Grid Method |
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| LIU Tielin,CHEN Haibin,JIAO Pengcheng.Calculation of Dynamic J Integral Based on Unstructured Grid Method[J].Journal of Shenyang Archit Civil Eng Univ: Nat Sci,2007,23(2):195-198. |
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| Authors: | LIU Tielin CHEN Haibin JIAO Pengcheng |
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| Abstract: | An algorithm is presented for the calculations of dynamic J integral and dynamic stress intensity factor.Based on the unstructured grid method,the calculation of dynamic J integral is conducted by discretizing the parts of line integral and area integral in the formula of the dynamic J integral.The invariance of the dynamic J integral is proofed numerically and the value of the dynamic J integral at any time is given.The time history curve of dynamic stress intensity factor is also obtained by using the relationship between the J integral and the stress intensity factor.The new algorithm is of the characteristics of simple code,less computation time and small required memory.It is an effective algorithm for studying the crack initiation under the action of dynamic load. |
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| Keywords: | dynamic J integral unstructured grid method triangular gird discretization |
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