东南大学学报（英文版）2021，Vol.37Issue(4)：401-407,7.DOI:10.3969/j.issn.1003-7985.2021.04.009
基于GTN损伤模型的铸钢节点力学性能评估
Evaluation of mechanical properties of cast steel nodes based on GTN damage model
摘要
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.关键词
铸钢节点/GTN损伤模型/承载能力/模型参数Key words
cast steel node/Gurson-Tvergaard-Needleman(GTN) damage model/bearing capacity/model parameters分类
建筑与水利引用本文复制引用
焦海涵,闫华东,靳慧..基于GTN损伤模型的铸钢节点力学性能评估[J].东南大学学报（英文版）,2021,37(4):401-407,7.基金项目
The National Key Research and Development Pro-gram 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. （No.2017YFC0805100）
