不同应变率下Q345钢材力学性能试验研究

发布时间：2018-06-30 03:36

本文选题：连续倒塌 + 应变率　；参考：《东南大学学报(自然科学版)》2015年06期

【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 high-speed tensile tests of Q345 steel were carried out by using Inston tensile tester and Zwick / Roell HTM5020 high speed tensile tester. The LS-DYNA module in ANSYS is used to simulate the tensile test under different loading rates. The real stress-strain curve of steel is obtained by combining the test and simulation. The simulation results show that the true stress-strain relationship of Q345 steel can be approximately described by Ludwik model and Voce model at low strain rate and high strain rate, respectively. By fitting the test data with the Hollomon criterion and Voce criterion linear combination model (H / V R model), it is verified that the H / V R model can accurately reflect the strain rate effect of Q345 steel, but there is still a slight deviation from the test data. In order to obtain a better empirical constitutive model, the strain rate criterion of Wagoner is introduced into the H / V-R constitutive model, and the H / V-R2 empirical constitutive model which can accurately reflect the strain rate effect of Q345 is obtained.
【作者单位】：同济大学土木工程学院;
【基金】：国家自然科学基金资助项目(51378381)
【分类号】：TU511.3

【共引文献】