[1]陈俊岭,李哲旭,舒文雅,等.不同应变率下Q345钢材力学性能试验研究[J].东南大学学报(自然科学版),2015,45(6):1145-1150.[doi:10.3969/j.issn.1001-0505.2015.06.022]
 Chen Junling,Li Zhexu,Shu Wenya,et al.Experimental study on dynamic mechanical behavior of Q345 steel under different strain rates[J].Journal of Southeast University (Natural Science Edition),2015,45(6):1145-1150.[doi:10.3969/j.issn.1001-0505.2015.06.022]
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不同应变率下Q345钢材力学性能试验研究()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
45
期数:
2015年第6期
页码:
1145-1150
栏目:
土木工程
出版日期:
2015-11-20

文章信息/Info

Title:
Experimental study on dynamic mechanical behavior of Q345 steel under different strain rates
作者:
陈俊岭李哲旭舒文雅李金威
同济大学土木工程学院, 上海 200092
Author(s):
Chen Junling Li Zhexu Shu Wenya Li Jinwei
College of Civil Engineering, Tongji University, Shanghai 200092, China
关键词:
连续倒塌 应变率 本构模型 Q345 力学性能
Keywords:
progressive collapse strain rate constitutive model Q345 mechanical behavior
分类号:
TU391
DOI:
10.3969/j.issn.1001-0505.2015.06.022
摘要:
利用INSTRON拉伸试验机和Zwick/Roell HTM5020型高速拉伸试验机对Q345钢材进行准静态和高速拉伸试验.采用ANSYS中的LS-DYNA模块对不同加载速率下的拉伸试验进行仿真模拟,通过试验与仿真相结合的方式获得了钢材的真实应力应变曲线.仿真结果显示,Q345钢的真实应力应变关系在低应变率和高应变率下可分别近似用Ludwik模型和Voce模型描述.通过采用Hollomon准则和Voce准则的线性组合模型(H/V-R模型)对试验数据进行拟合,验证了H/V-R模型能比较准确地反映Q345钢的应变率效应,但和试验数据仍稍有偏差.为得到更优的经验型本构模型,将Wagoner的应变率准则引入H/V-R本构模型,进一步优化得到了可准确反映Q345应变率效应的H/V-R2经验型本构模型.
Abstract:
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.

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备注/Memo

备注/Memo:
收稿日期: 2015-04-21.
作者简介: 陈俊岭(1974—),女,博士, 副教授, chenjl@tongji.edu.cn.
基金项目: 国家自然科学基金资助项目(51378381).
引用本文: 陈俊岭,李哲旭,舒文雅,等.不同应变率下Q345钢材力学性能试验研究[J].东南大学学报:自然科学版,2015,45(6):1145-1150. [doi:10.3969/j.issn.1001-0505.2015.06.022]
更新日期/Last Update: 2015-11-20