董建鹏, 王时龙, 周杰, 杨波, 马驰. 基于修正GTN模型的不锈钢管剪切过程韧性断裂准则研究[J]. 工程力学, 2021, 38(3): 239-247. DOI: 10.6052/j.issn.1000-4750.2020.05.0303
引用本文: 董建鹏, 王时龙, 周杰, 杨波, 马驰. 基于修正GTN模型的不锈钢管剪切过程韧性断裂准则研究[J]. 工程力学, 2021, 38(3): 239-247. DOI: 10.6052/j.issn.1000-4750.2020.05.0303
DONG Jian-peng, WANG Shi-long, ZHOU Jie, YANG Bo, MA Chi. THE DUCTILE FRACTURE CRITERION OF STAINLESS-STEEL TUBES IN THE SHEARING PROCESS BASED ON MODIFIED GTN MODEL[J]. Engineering Mechanics, 2021, 38(3): 239-247. DOI: 10.6052/j.issn.1000-4750.2020.05.0303
Citation: DONG Jian-peng, WANG Shi-long, ZHOU Jie, YANG Bo, MA Chi. THE DUCTILE FRACTURE CRITERION OF STAINLESS-STEEL TUBES IN THE SHEARING PROCESS BASED ON MODIFIED GTN MODEL[J]. Engineering Mechanics, 2021, 38(3): 239-247. DOI: 10.6052/j.issn.1000-4750.2020.05.0303

基于修正GTN模型的不锈钢管剪切过程韧性断裂准则研究

THE DUCTILE FRACTURE CRITERION OF STAINLESS-STEEL TUBES IN THE SHEARING PROCESS BASED ON MODIFIED GTN MODEL

  • 摘要: 为了改善修正Gurson-Tvergaard-Needleman模型(修正GTN模型)无法准确模拟不锈钢管剪切过程的缺陷,该文在原模型基础上,构造了一个与位移相关的损伤函数作为新的断裂准则。同时,在ABAQUS中采用隐式向后Euler应力更新算法编制了改进后模型的VUMAT用户子程序,实现了其数值求解。最后进行了SUS304不锈钢管剪切试验,通过分析对比试验数据与改进后模型的模拟结果,验证了该文所提出的方法的准确性。

     

    Abstract: To improve the defect that the modified Gurson-Tvergaard-Needleman model (modified GTN model) cannot accurately simulate the shearing process of stainless-steel tubes, a displacement-related damage function is constructed as a new fracture criterion based on the original model. A VUMAT user subroutine of the modified model is developed in ABAQUS using the implicit backward Euler stress updating algorithm. A shear experiment of SUS304 stainless-steel tubes was carried out, and the accuracy and validity of the proposed method was verified by comparing the experimental and simulated results.

     

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