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A more appropriate FE model to predict the creep crack initiation and growth behavior of brazed joint

机译：一种更合适的Fe模型，以预测钎焊关节的蠕变裂纹启动和生长行为

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摘要

In this paper, a more appropriate finite element (FE) model was proposed to predict the creep crack initiation (CCI) and growth (CCG) behavior of HastelloyC276-BNi2 brazed joint at high temperature. The effects of single-material, bi-material and three-material method on CCI and CCG behavior have been discussed fully. The relationships between CCG rate and parameter C* for different simulation methods were obtained. The results show that the simulation method has a great influence on CCI and CCG behavior of brazed joint. The brazed residual stress (RS) can accelerate CCI and enhance CCG rate, leading to the reduction of creep life. The CCI time and creep life predicted by single-material method is smaller than those by bi-material and three-material method. The creep life and crack growth morphology predicted by single-material method have a good consistent with the experimental results. The single-material method can accurately predict the CCG behavior of brazed joints. Bigger uniaxial creep strain can prolong the CCI time and reduce the CCG rate. The creep life of brazed joint can be enhanced by increasing uniaxial creep strain.
机译：在本文中，提出了一种更合适的有限元（Fe）模型，以预测高温下HastelloyC276-BNI2钎焊接头的蠕变裂纹起始（CCI）和生长（CCG）行为。完全讨论了单材料，双材料和三种方法对CCI和CCG行为的影响。获得了CCG速率与参数C *的关系，用于不同仿真方法。结果表明，仿真方法对钎焊关节的CCI和CCG行为有很大影响。钎焊的残余应力（RS）可以加速CCI并提高CCG率，从而降低蠕变寿命。通过单材料方法预测的CCI时间和蠕变寿命小于双材料和三种材料的方法。单材料方法预测的蠕变寿命和裂纹生长形态与实验结果有良好的一致性。单材料方法可以准确地预测钎焊接头的CCG行为。更大的单轴蠕变应变可以延长CCI时间并降低CCG率。通过增加单轴蠕变应变，可以增强钎焊接头的蠕变寿命。

著录项

  • 来源
    《Engineering Fracture Mechanics》 |2018年第2018期|共15页
  • 作者

    Luo Yun; Zhang Qian; Jiang Wenchun; Zhang Yu-cai; Yang Bin; Tu Shan-Tung;

  • 作者单位

    China Univ Petr East China State Key Lab Heavy Oil Proc Coll Chem Engn Qingdao 266555 Peoples R China;

    China Univ Petr East China Coll Mech &

    Elect Engn Qingdao 266555 Peoples R China;

    China Univ Petr East China State Key Lab Heavy Oil Proc Coll Chem Engn Qingdao 266555 Peoples R China;

    China Univ Petr East China State Key Lab Heavy Oil Proc Coll Chem Engn Qingdao 266555 Peoples R China;

    China Univ Petr East China State Key Lab Heavy Oil Proc Coll Chem Engn Qingdao 266555 Peoples R China;

    East China Univ Sci &

    Technol Sch Mech &

    Power Engn Key Lab Pressure Syst &

    Safety MOE Shanghai 200237 Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程力学;
  • 关键词

    Brazed joint; Creep crack growth; Creep ductility; Simulation method;

    机译：钎焊联合;蠕变裂纹增长;蠕变延展性;仿真方法;

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