Experimental study on dynamic mechanical behavior of Q345 steel under different strain rates

被引：11

作者：

Chen, Junling ^{[1
]}

Li, Zhexu ^{[1
]}

Shu, Wenya ^{[1
]}

Li, Jinwei ^{[1
]}

机构：

[1] College of Civil Engineering, Tongji University, Shanghai

来源：

Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | 2015年 / 45卷 / 06期

关键词：

Constitutive model; Mechanical behavior; Progressive collapse; Q345; Strain rate;

D O I：

10.3969/j.issn.1001-0505.2015.06.022

中图分类号：

学科分类号：

摘要：

Quasi-static and dynamic tensile tests of Q345 steel were performed with INSTRON and Zwick/Roell HTM5020 testing machine. Simulations of these tensile tests under different strain rates were developed using LS-DYNA of ANSYS. And their true stress-strain relationships after necking were obtained through a hybrid experimental-numerical method. The simulation results show that the true stress-strain relationship of Q345 steel can be approximately described with Ludwik model at quasi-static strain rates and with Voce model at higher strain rates. The linear combination of Hollomon and Voce (H/V-R) model is adopted to fit the experimental data. The results show that the H/V-R model can predict the strain rate effects of Q345 steel although there is still a little deviation between the experimental and fitting results. To establish a better constitutive model, the Wagoner rate law is introduced into the H/V-R model. Then an empirical constitutive model H/V-R2 which can reflect the strain rate effect of Q345 steel accurately is finally obtained by further improvement. © 2015, Southeast University. All right reserved.

引用

页码：1145 / 1150

页数：5

共 18 条

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