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[1] Jiao Haihan, Yan Huadong, Jin Hui, et al. Evaluation of mechanical properties of cast steel nodesbased on GTN damage model [J]. Journal of Southeast University (English Edition), 2021, 37 (4): 401-407. [doi:10.3969/j.issn.1003-7985.2021.04.009]
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Evaluation of mechanical properties of cast steel nodesbased on GTN damage model()
基于GTN损伤模型的铸钢节点力学性能评估
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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:
37
Issue:
2021 4
Page:
401-407
Research Field:
Materials Sciences and Engineering
Publishing date:
2021-12-20

Info

Title:
Evaluation of mechanical properties of cast steel nodesbased on GTN damage model
基于GTN损伤模型的铸钢节点力学性能评估
Author(s):
Jiao Haihan1;  2;  Yan Huadong1;  3;  Jin Hui1;  2
1Jiangsu Key Laboratory of Engineering Mechanics, Southeast University, Nanjing 211189, China
2School of Civil Engineering, Southeast University, Nanjing 211189, China
3Test and Measuring Academy of Norinco Group, Huayin 714200, China
焦海涵1;  2;  闫华东1;  3;  靳慧1;  2
1东南大学江苏省工程力学分析重点实验室, 南京 211189; 2东南大学土木工程学院, 南京 211189; 3中国兵器工业试验测试研究院, 华阴 714200
Keywords:
cast steel node;  Gurson-Tvergaard-Needleman(GTN)damage model;  bearing capacity;  model parameters
铸钢节点;  GTN损伤模型;  承载能力;  模型参数
PACS:
TU512.9
DOI:
10.3969/j.issn.1003-7985.2021.04.009
Abstract:
Based on the Gurson-Tvergaard-Needleman(GTN)damage model considering the defect damage evolution, the influence of void defects caused by the casting process on cast steel nodes’ mechanical properties was studied. Firstly, based on the GTN damage model, the model’s parameter combination of G20Mn5N cast steel was given. Then, the mechanical properties of cast steel nodes were evaluated using the GTN damage model in ABAQUS software, and the influence of model parameters on the failure results was investigated. The results show that the cast steel node considering the GTN damage model fails under 1.93 times of the load. The bearing capacity is lower than that of the bilinear model, and the failure speed is faster. Changes in model parameters will cause a shift in the failure critical point. Meanwhile, the plastic strain index affects the void volume fractions, which shows different variation laws under uniaxial tensile and cyclic loads. Therefore, the GTN damage model establishes the relationship between the micro-defects and macro-mechanical properties of materials, which can better simulate the failure results of structures.
基于考虑缺陷损伤演化过程的GTN损伤模型, 研究了铸造工艺引起的孔洞缺陷对铸钢节点力学性能的影响.首先, 基于GTN损伤模型推导出G20Mn5N铸钢GTN模型的最佳参数组合.然后, 在ABAQUS软件中利用GTN损伤模型对铸钢节点的力学性能进行评估, 并研究了模型参数对铸钢节点破坏过程的影响.结果表明, 考虑GTN损伤模型的铸钢节点在1.93倍的载荷下发生破坏, 承载能力低于二折线模型, 且破坏速度更快.模型参数的改变会导致临界失效点移动.孔隙体积分数的变化规律受塑性应变指数的影响, 并在单向拉伸载荷和循环载荷下呈现出不同的变化规律.GTN损伤模型建立了材料微观缺陷与宏观力学性能之间的关系, 能够较好地模拟结构的破坏过程.

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Memo

Memo:
Biographies: Jiao Haihan(1997—), male, graduate; Jin Hui(corresponding author), female, doctor, professor, jinhui@seu.edu.cn.
Foundation items: The National Key Research and Development Program of China(No. 2017YFC0805100), the National Natural Science Foundation of China(No. 51578137), the Priority Academic Program Development of Jiangsu Higher Education Institutions, the Open Research Fund Program of Jiangsu Key Laboratory of Engineering Mechanics.
Citation: Jiao Haihan, Yan Huadong, Jin Hui.Evaluation of mechanical properties of cast steel nodes based on GTN damage model[J].Journal of Southeast University(English Edition), 2021, 37(4):401-407.DOI:10.3969/j.issn.1003-7985.2021.04.009.
Last Update: 2021-12-20