有限元子模型法计算箱形结构表面裂纹应力强度因子  

Stress Intensity Factors of Surface Cracks in a Box Structure by Sub-modeling Technology of Finite Element

作　　者：涂周杰[1] 李国清[1] 张辉[1] 陈传尧[1] 

机构地区：[1]华中科技大学土木工程与力学学院,湖北武汉430074

出　　处：《华中科技大学学报（城市科学版）》2006年第z2期65-67,70,共4页Journal of Huazhong University of Science and Technology

摘　　要：箱形结构中应力集中部位椭圆形表面裂纹区域的名义应力场分布不规则,无法使用现有的解析解和经验公式,有限元子模型法是求解此类问题的途径之一.文中分别计算了平板和箱形结构中包含椭圆形表面裂纹的三个应力强度因子,并将计算结果与N ewm an-R a ju公式以及疲劳试验结果进行了对比和分析.结果表明:有限元子模型法可以直接而且有效地计算此类结构中表面裂纹的应力强度因子.The stress intensity factors(SIF) of semi-elliptical cracks located in the stress concentration areas of a box structure is calculated.The common characteristic of the problems is that the nominal stress field at the crack area varies abnormally along three directions,so either analytical or semi-analytical solutions to such problems are not available.The sub-modeling technique of finite element analysis or FEA is studied as an alterative numerical method.Three SIFs of cracked plane or box structure are computed by using FE sub-modeling technique,and the results are compared with Newman-Raju formula and the structure fatigue test.It is found that the proposed method is an efficient numerical approach to determine the SIF of semi-elliptical cracks in complex structure.

关 键 词：应力强度因子 表面裂纹 疲劳试验 有限元 

分 类 号：TU391[建筑科学—结构工程] O241.82[理学—计算数学]