[1]闫华东,唐琦,靳慧.考虑含缩孔缺陷的铸钢节点损伤演化分析[J].东南大学学报(自然科学版),2019,49(5):904-910.[doi:10.3969/j.issn.1001-0505.2019.05.013]
 Yan Huadong,Tang Qi,Jin Hui.Damage evolution analysis on cast steel joints with porosity defects[J].Journal of Southeast University (Natural Science Edition),2019,49(5):904-910.[doi:10.3969/j.issn.1001-0505.2019.05.013]
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考虑含缩孔缺陷的铸钢节点损伤演化分析()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
49
期数:
2019年第5期
页码:
904-910
栏目:
土木工程
出版日期:
2019-09-20

文章信息/Info

Title:
Damage evolution analysis on cast steel joints with porosity defects
作者:
闫华东12唐琦123靳慧12
1东南大学土木工程学院, 南京 211189; 2东南大学江苏省工程力学分析重点实验室, 南京 211189; 3中国路桥工程有限责任公司, 北京 100011
Author(s):
Yan Huadong12 Tang Qi123 Jin Hui12
1School of Civil Engineering, Southeast University, Nanjing 211189, China
2Jiangsu Key Laboratory of Engineering Mechanics, Southeast University, Nanjing 211189, China
3China Road and Bridge Co., Ltd., Beijing 1000
关键词:
铸钢节点 浇铸模拟 缩孔缺陷 损伤演化
Keywords:
cast steel joint casting simulation porosity defect damage evolution
分类号:
TU391
DOI:
10.3969/j.issn.1001-0505.2019.05.013
摘要:
首先通过有限元数值模拟结果与已发表文献中的材性试验数据对比,确定了低合金铸钢G20Mn5的GTN模型的最优参数组合.然后采用ProCAST铸造软件对K型铸钢节点的浇冒口系统进行设计并确定浇铸模拟条件,根据数值分析结果统计了缩孔缺陷的体积分数和位置分布等信息.最后基于GTN损伤模型参数的标定结果和K型铸钢节点的铸造模拟结果,对含初始铸造缺陷的铸钢节点进行力学分析,研究初始缺陷和材料性能劣化对铸件力学性能的影响.由铸钢节点的孔洞体积分数分布云图和等效塑性应变分布云图的对比结果可知,GTN损伤模型将基体材料的等效塑性应变和损伤变量有机耦合起来,模拟结果可以更加真实地反映铸造缺陷对铸钢件承载能力的影响,为铸件在工程中更好的应用提供参考依据.
Abstract:
Firstly, the optimal parameter combination for Gurson-Tvergaard-Needleman(GTN)model of low-alloy cast steel G20Mn5 was determined by comparing finite element analysis results with existed experimental data. Then, the pouring riser system and casting simulation conditions of K cast steel joints were designed, and the volume fraction and the location distribution of porosity defects were simulated by casting software ProCAST. Finally, based on the calibration results of GTN model parameters and the casting simulation results of K cast steel joint, the effects of casting defects and damage on the mechanical properties of K cast steel joint with porosity defects were investigated. Compared the pore volume fraction and the equivalent plastic strain distribution nephogram of the cast steel joint, it can be known that the GTN damage model organically couples the plastic strain and the damage of the matrix material. Therefore, the simulation results can more accurately reflect the influence of the casting defects on bearing capacity of steel castings, providing a reference for the better application of castings in engineering.

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备注/Memo

备注/Memo:
收稿日期: 2018-11-30.
作者简介: 闫华东(1990—),女,博士生; 靳慧(联系人),女,博士,教授,博士生导师,jinhui@seu.edu.cn.
基金项目: 国家自然科学基金资助项目(51578137)、国家重点研发计划资助项目(2017YFC0805100)、江苏省高校优势学科建设工程资助项目、江苏省工程力学分析重点实验室开放课题资助项目.
引用本文: 闫华东,唐琦,靳慧.考虑含缩孔缺陷的铸钢节点损伤演化分析[J].东南大学学报(自然科学版),2019,49(5):904-910. DOI:10.3969/j.issn.1001-0505.2019.05.013.
更新日期/Last Update: 2019-09-20