| 基于修正GTN模型的不锈钢管剪切过程韧性断裂准则研究 |
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| 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. |
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| 作者姓名： | 董建鹏 王时龙 周杰 杨波 马驰 |
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| 作者单位： | 重庆大学机械传动国家重点实验室,重庆400044 |
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| 基金项目： | 国家自然科学基金项目(51605057);中央高校基本科研业务费项目(2018CDXYJX0019)。 |
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| 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。
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| 关 键 词： | 固体力学 GTN本构方程 损伤 断裂准则 有限元方法 |
| 收稿时间： | 2020-05-16 |
THE DUCTILE FRACTURE CRITERION OF STAINLESS-STEEL TUBES IN THE SHEARING PROCESS BASED ON MODIFIED GTN MODEL |
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| 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. |
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| Authors: | DONG Jian-peng WANG Shi-long ZHOU Jie YANG Bo MA Chi |
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| Affiliation: | State Key Laboratory of Mechanical Transmissions, University of Chongqing, Chongqing 400044, China |
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| 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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| Keywords: | solid mechanics GTN constitutive equation damage fracture criterion finite element method |
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