Simulation of fatigue crack growth in welded joints
Simulation of fatigue crack growth in welded joints
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DOI：
10.1002/mawe.201400366
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发表时间：
2015-02
影响因子：
1.1
通讯作者：
H. Beier;B. Schork;J. Bernhard;D. Tchoffo Ngoula;T. Melz;M. Oechsner;M. Vormwald
中科院分区：
文献类型：
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作者：
H. Beier;B. Schork;J. Bernhard;D. Tchoffo Ngoula;T. Melz;M. Oechsner;M. Vormwald
本文综述了达姆施塔特集团在一个名为基于整体断裂力学的焊接件疲劳强度测定（IBESS）项目中的最新研究成果。本项目的目的是基于断裂力学的焊接接头Wöhler‐曲线（S-N ‐曲线）模拟。该项目的一部分是调查焊接接头的初始缺陷和缺陷。已经进行了金相和断口调查，以得出初始裂纹情况的定义。此外，多个短裂纹的裂纹扩展的调查进行的基础上的热成像和断口分析研究。基于整体断裂力学的焊接件疲劳强度测定的另一部分关注焊接接头中由于循环载荷下的瞬时塑性变形行为而产生的残余应力场的稳定性。采用Döring材料模型进行了数值模拟，研究了循环载荷对无裂纹和有裂纹情况下残余应力场的影响。
This paper gives an overview on recent research results of the Darmstadt group inside a project called integral fracture mechanics based determination of the fatigue strength of weldments (IBESS). Purpose of this project is the fracture mechanics based simulation of Wöhler‐curves (S‐N‐curves) of welded joints. Part of this project is the investigation of initial defects and imperfections of welded joints. Metallographic and fractographic investigations have been done to derive a definition of an initial crack situation. Also investigations of the crack growth of multiple short cracks were performed on the basis of thermographic and fractographic studies. Another part of integral fracture mechanics based determination of the fatigue strength of weldments gives attention to the stability of the residual stress field in a welded joint due to the transient plastic deformation behaviour under cyclic loading. Numerical simulations using Döring's material model have been done to investigate the effect of a cyclic loading on a residual stress field in an uncracked and a cracked situation.