摘要
作为Q345钢的替代钢种,Q355钢将于2019年2月起大量应用于建筑工程中。基于结构抗冲击爆炸性能研究的需要,其动态材料性能的研究具有迫切性和必要性。应用万能材料试验机与分离式霍普金森压杆系统对Q355B钢在不同温度、应变率及应力状态下的力学性能进行了研究。发现塑性流动应力与断裂应变随温度的上升分别呈现非线性下降与上升趋势,采用试验为主数值模拟为辅的方法分别标定了修正Johnson-Cook本构关系与修正Johnson-Cook断裂准则。最后,开展了Q355B钢Taylor撞击试验,验证了修正Johnson-Cook模型及其参数标定的有效性。
As a substitute of Q345 steel,dynamic material Q355 steel is about to be largely applied in construction engineering.Due to the demand on the shock and explosion characteristics of material in structural engineering,the study on its dynamic behavior is urgent and necessary.The mechanical properties of Q355B steel at different temperature,stain rate and stain condition were investigated using a universal testing machine and a split Hopkinson pressure bar system.It is found that the plastic flow stress decreases nonlinearly and the fracture stain increases nonlinearly with the increase of temperature.Then,the modified Johnson-Cook constitutive relation and fracture criteria were calibrated respectively by using the results of tests and numerical simulations.Finally,Taylor impact tests were carried out to verify the validity of the MJC model and its parameter calibration.
作者
林莉
黄博
肖新科
朱昱
徐天立
LIN Li;HUANG Bo;XIAO Xinke;ZHU Yu;XU Tianli(College of Architecture Engineering,Harbin University of Science and Technology,Harbin 150080,China;School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China;School of Civil Engineering,Nanyang Institute of Technology,Nanyang 473004,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2020年第18期231-237,共7页
Journal of Vibration and Shock
基金
黑龙江省自然科学基金联合引导项目(LH2019E060)
哈尔滨市优秀学科带头人项目(2017RAXXJ009)
国家自然科学基金面上项目(51578515)。
