A porosity closure model considering stress triaxiality ratio and Lode stress parameter

A porosity closure model considering stress triaxiality ratio and Lode stress parameter
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考虑应力三轴比和洛德应力参数的孔隙闭合模型

DOI:
10.1016/j.jmatprotec.2020.116824
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发表时间:
2020-12
影响因子:
6.3
通讯作者:
Zhou Tao
Zhou Tao
中科院分区:
材料科学1区
文献类型:
--
作者:
Zhang Qi;Niu Liqun;Liang Zhenglong;Cao Miao;Zhou Tao

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金属成形工艺的设计和优化迫切需要孔隙闭合模型。采用代表性体元法建立了高精度的平均场模型.以下将其称为基于应力三轴度比和矿脉应力参数(STLB)的模型。STLB模型的平均误差为2.35%,并通过与显式仿真和实验的比较进行了验证。当压下率为25%~ 60%时,STLB模型比基于应力三轴度(STB)的模型更精确。STLB模型易于应用于有限元分析,便于工艺设计和优化。
The porosity closure model is urgently needed to design and optimize the metal forming process. A high and accurate mean filed model is developed by Representative Volume Element (RVE) simulations. It is referred to below as the stress triaxiality ratio and Lode stress parameter-based (STLB) model. The STLB model has an average error of 2.35 % and it is validated by comparison with explicit simulations and experiments. The STLB model is more accurate than the stress triaxiality-based (STB) model when the reduction ratio is from 25 % to 60 %. It is convenient to use STLB model for process design and optimization as the model can be easily applied to finite element analysis.
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