基于GTN损伤模型的AISI型316LN不锈钢焊缝裂纹扩展数值研究

Q4 Engineering

International Journal of Materials and Structural Integrity Pub Date : 2019-06-27 DOI:10.1504/IJMSI.2019.10022240

N. Deepak, C. L. Rao, S. Krishnan, G. Sasikala, R. Prakash

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引用次数: 1

摘要

采用Gurson-Tvergaard-Needleman（GTN）损伤模型，对奥氏体316LN不锈钢焊接接头的延性裂纹扩展进行了有限元模拟研究。基于拉伸和紧凑拉伸试样的耦合实验和数值模拟，评估和校准了材料特定的GTN损伤参数。使用CT几何结构分析了焊缝厚度上不同位置的初始裂纹尖端的影响。模拟结果表明，对于位于中心位置的焊缝，裂纹沿初始裂纹线扩展，而对于界面焊缝，裂纹偏离裂纹线。用等效塑性应变和孔隙体积分数等损伤参数解释了所有情况下的裂纹扩展路径。

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Numerical investigation of crack growth in AISI type 316LN stainless steel weld joint using GTN damage model

Ductile crack growth in austenitic 316LN stainless steel weld joint has been studied using FEA simulations with Gurson-Tvergaard-Needleman (GTN) damage model. The material specific GTN damage parameters are assessed and calibrated based on coupled experimental and numerical simulations for tensile and compact tension specimens. The influence of initial crack tip at various locations across the weld thickness has been analysed using CT geometry. The simulated results reveal that the crack propagates along the initial crack line for centrally located welds and deviates from the crack line for interfacial welds. The crack growth path for all cases is explained with damage parameters like equivalent plastic strain and void volume fraction.

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来源期刊

International Journal of Materials and Structural Integrity Engineering-Mechanical Engineering

CiteScore

0.40

自引率

0.00%

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