文献类型：期刊文献

中文题名：基于内聚力模型的T型钎焊接头裂纹扩展数值模拟

英文题名：Numerical Simulation of Crack Propagation of T- type Brazed Joints Based on Cohesive Zone Model

作者：陈兴[1];舒双文[1];周帼彦[1];庄法坤[1];涂善东[1]

机构：[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,上海200237

年份：2014

卷号：31

期号：8

起止页码：7

中文期刊名：压力容器

外文期刊名：Pressure Vessel Technology

收录：CSTPCD

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

语种：中文

中文关键词：内聚力模型;裂纹扩展;钎焊接头;有限元;数值模拟

外文关键词：cohesive zone model;;crack propagation;;brazed joint;;finite element;;numerical simulation

摘要：钎焊接头的钎缝是板翅式回热器中的薄弱环节,最容易产生裂纹。通过有限元模拟和试验相结合的方法得到T型316L/BNi-2钎焊接头的内聚能Gc和损伤起始应力σmax,并使用内聚力模型研究了接头的裂纹起裂和扩展过程。模拟结果与试验结果吻合较好,表明内聚力模型可以很好地预测316L/BNi-2 T型钎焊接头的裂纹起裂和扩展过程,且可以将其用于钎焊接头裂纹扩展规律的研究。此外,模拟结果还表明,提高母材屈服强度可以明显地改善钎焊接头的抗开裂能力。
The brazing seam of joint is the weakest region in the plate-fin regenerator,in which crack is most likely to be formed.The cohesive energy Gc and the damage initial stress σmax are two important pa-rameters of the cohesive zone model,which are obtained by experiments and simulations.And then,the crack initiation and propagation of the 316L/BNi-2 T-type brazed joints are simulated by finite element method combined with the cohesive zone model.The results show that the load-displacement curves ob-tained by numerical simulation agree well with the experimental curves.It demonstrates that it is feasible to study the crack initiation and propagation of 316L/BNi-2 T-type brazed joints by using the cohesive zone model.Besides,numerical results show that anti-crack ability of the brazed joints can be obviously enhanced through improving the yield stress of the parent material.