用裂纹张开位移全场拟合法求应力强度因子-边裂纹问题  

COMPUTATION OF STRESS INTENSITY FACTORS BY USING GLOBAL CRACK-OPENING DISPLACEMENT FITTING PROCEDURE: EDGE CRACKS

作　　者：黎在良[1] 蒋和洋[2] 

机构地区：[1]北京航空航天大学固体力学研究所,北京100083 [2]北京工业大学土木工程系,北京100022

出　　处：《固体力学学报》2000年第4期355-360,共6页Chinese Journal of Solid Mechanics

基　　金：北京市自然科学基金!(项目编号 :8982 0 0 6 )资助项目

摘　　要：从一组给定的裂纹张开位移 (COD)资料求应力强度因子 (SIF)的好方法应具有以下特征 :( 1)这个方法应最大限度地利用已知的COD信息 ;( 2 )数值计算只包含位移量 ;( 3)后处理简单 ;( 4 )所得到的SIF的误差可由COD资料本身的误差来估计 .该文将求内裂纹SIF的COD全场拟合法扩充应用到边裂纹问题 ,该方法具有上述优点 .对几种典型的边裂纹用边界元法得到的COD资料 ,用这种方法得到了可靠性高、一致性好的SIF 。From a given set of crack opening displacement (COD) data, a good procedure to extract the stress intensity factors should have the following features: (1) The procedure should make full use of the known COD data. (2) The numerical calculation should only involve displacement fields. (3) The post procedure should be as simple as possible. (4) The error of the obtained stress intensity factor can be estimated from the error information of COD data in themselves. The Global Crack Line Displacement Fitting Procedure for internal cracks has been extended to the use for edge cracks in this work. The procedure possesses the above mentioned features. Reliable and well consistent stress intensity factors are obtained for several typical edge cracks by using this procedure, and the accuracy has reached the average accuracy of the corresponding COD data.

关 键 词：应力强度因子 裂纹张开位移 边裂纹 曲线拟合 全场拟合法 

分 类 号：O346[理学—固体力学]