冲击载荷下砂岩SHPB实验的有限元模拟  

Finite element simulation of sandstone SHPB experiment under impact load

作　　者：陆杉 巫绪涛[1] LU Shan;WU Xutao(School of Civil and Hydraulic Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学土木与水利工程学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2022年第11期1517-1521,共5页Journal of Hefei University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(51579062)。

摘　　要：文章用LS-DYNA有限元软件对砂岩分离式Hopkinson压杆(split Hopkinson pressure bar,SHPB)实验过程进行数值模拟,按实际装置尺寸及实测入射波数据建立有限元模型;运用控制变量法,分析Holmquist-Johnson-Cook(HJC)模型中极限面参数对不同应变率下砂岩材料应力-应变曲线的影响规律;结合实验与有限元模拟结果,得到2种砂岩HJC本构模型参数及模型参数确定方法。不同应变率下2种砂岩SHPB实验得到的入射波、反射波、透射波及应力-应变曲线与数值模拟结果均很好吻合,验证了岩石HJC本构模型参数确定方法的有效性。A finite element model was established according to the actual device size and the measured incident wave data.The split Hopkinson pressure bar(SHPB)process of sandstone was numerically simulated by LS-DYNA finite element software.The influence of limit surface parameters in Holmquist-Johnson-Cook(HJC)model on the stress-strain curves of sandstone materials at different strain rates was analyzed by using the control variable method.Based on the results of experiment and finite element simulation,two kinds of parameters of HJC constitutive model and their determination methods were obtained.Under different strain rates,the stress-strain curves and incident wave,reflected wave,transmitted wave obtained by SHPB experiment are in good agreement with the numerical simulation results.The validity of the method to determine the parameters of rock HJC constitutive model is verified.

关 键 词：冲击荷载 分离式Hopkinson压杆(SHPB) Holmquist-Johnson-Cook(HJC)本构模型 砂岩 数值模拟 

分 类 号：TD315.1[矿业工程—矿井建设] TD315.3