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中文摘要：
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。
英文摘要：
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.
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