随机载荷作用下焊接结构表面裂纹扩展研究  

Study on surface crack propagation of welded structure under random loading

作　　者：曲先强[1] 崔洪斌[1] 吕春雷[1] 马永亮[1] 张杰[1] 

机构地区：[1]哈尔滨工程大学船舶工程学院,哈尔滨150001

出　　处：《船舶力学》2008年第2期272-276,共5页Journal of Ship Mechanics

摘　　要：随机载荷作用下焊接结构表面裂纹的扩展问题是工程结构中常见的问题。文中设计了随机载荷作用下焊接结构的疲劳断裂试验,试样由平板以一定的角度焊接而成,配合相应的夹具采用轴向加载,在MTS疲劳试验机上进行试验,采用应变片对裂纹的萌生进行监测,用降载勾线法描绘裂纹的扩展形貌,最后利用试验数据对文献中提到的等效厚度法和等效应力强度因子法进行了验证,结果表明:这两种方法的计算结果都与试验结果比较接近,可以用于计算表面裂纹的疲劳扩展。The problems of welded structure surface crack propagation under random loading are common in engineering structure.A fatigue fracture test of given degree butt welding plane plate under random load-ing is designed. The strain gauges are used to identify the crack initiation. The shape of the surface crack is recorded by a marking technique. Furthermore, the test data are used to verify the equivalent calculation methods mentioned in the literature. It is shown that the calculation results fit well with test results, and the equivalent calculation method can be used to calculate the propagation of surface crack.

关 键 词：随机载荷 表面裂纹 扩展 

分 类 号：TG404[金属学及工艺—焊接]