双裂纹尖端应力场及其扩展规律研究  

Double crack tip stress field and expansion research

作　　者：谭金华[1] 

机构地区：[1]武汉理工大学交通学院

出　　处：《山西建筑》2008年第17期78-79,共2页Shanxi Architecture

摘　　要：以平阴黄河大桥为研究对象,采用含双裂纹尖端的钢桁架桥精细断裂力学分析模型,在与单裂尖同样的结构系统和外荷载作用下,并施以同样的循环荷载次数和扩展规则模拟其扩展过程,研究双裂纹尖端的三轴应力场、J积分和扩展速率,并与单裂尖的对应值进行比较。Setting the Pingyin yellow river Bridge as research objects, in this article we use the steel truss bridge fine fracture mechanics anatomic model including the double crack tip. With the single crack tip similar structure system and under the outside load function, and serves with the similar cyclic load times and the expansion rule simulates its expansion process, studies the double crack tip the three axle stress field, the J integral and the expansion speed and compares with the single crack tip＇s corresponding value.

关 键 词：双裂纹尖端 应力场 裂纹扩展 

分 类 号：TU312[建筑科学—结构工程]