三点弯钎焊接头裂纹扩展数值模拟  

Numerical Simulation of Crack Growth at Three-point Bending Brazed Joint

作　　者：陈兴[1] 周帼彦[1] 舒双文[1] 王琼琦[1] 朱奎龙[1] 

机构地区：[1]华东理工大学机械与动力工程学院承压系统与安全教育部重点实验室

出　　处：《化工机械》2014年第6期779-783,共5页Chemical Engineering & Machinery

基　　金：国家自然科学基金项目(50905060;50835003);中央高校基本科研业务费专项资金资助项目(WG121402)

摘　　要：为了研究钎焊接头裂纹起裂和扩展规律,利用内聚力模型模拟三点弯钎焊接头裂纹扩展过程。通过试验得到钎焊接头起裂时所能承受的最大载荷为1 364.83N,与模拟值1 392.29N很接近。在裂纹扩展阶段,通过试验得到的载荷-张开位移曲线与模拟结果吻合较好,说明内聚力模型可以很好地预测三点弯钎焊接头裂纹扩展过程。In order to research the law of crack occurrence and growth, applying bilinear cohesive zone model to simulating the crack growth process of the three-point bending joint was implemented. The testing results show that the maximum load on the brazed joint＇s crack occurrence can be 1364.83N close to 1392.29N sim- ulated; and in the crack growth, the load-crack opening displacement curve from the experiments agrees well with the simulation results, this indicates that the cohesive zone model can accurately prediet the cracking process at the brazed joint.

关 键 词：板翅式回热器 三点弯钎焊接头 内聚力模型 裂纹扩展 

分 类 号：TQ052.5[化学工程]