基于元件组合理论的砂岩动态损伤本构模型  

Dynamic damage constitutive model of sandstone based on component combination theory

作　　者：江雅勤 吴帅峰 刘殿书[1] 贾贝 王蒙 李晓璐[1] JIANG Yaqin;WU Shuaifeng;LIU Dianshu;JIA Bei;WANG Meng;LI Xiaolu(School of Mechanics ＆ Civil Engineering,China University of Mining and Technology,Beijing 100083,China;Department of Geotechnical Engineering,China Institute of Water Resources and Hydropower Research,Beijing 100044,China)

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083 [2]中国水利水电科学研究院岩土工程研究所,北京100044

出　　处：《爆炸与冲击》2018年第4期827-833,共7页Explosion and Shock Waves

基　　金：中央高校基本科研业务费专项资金项目(2010QL05);教育部博士点基金项目(20100023110001)

摘　　要：采用分离式霍普金森压杆(SHPB)系统,对砂岩进行不同速度下的冲击试验,得到砂岩的应变率效应特征以及典型的动态本构曲线。该曲线分为近似线弹性阶段、塑性阶段、塑性增强阶段和正向卸载阶段。通过组合模型的方法,构建了砂岩含损伤的动态本构模型,借助LS-DYNA软件中的用户材料子程序UMAT接口实现对本构模型的二次开发,并对砂岩在冲击速度为7.5、9.5、11.5和13.5m/s 4种情况下的SHPB动态冲击压缩试验进行模拟。结果表明:所构建的模型可以很好地描述砂岩的应变率效应和应力-应变曲线弹性段,并且动态峰值强度、最大应变均与试验结果一致,应变率、峰值强度、最大应变与试验结果的相对误差不超过10%。所构建的砂岩动态本构模型能够准确地描述砂岩在冲击作用下的动态力学特性。In this study,using a split Hopkinson pressure bar（SHPB）system,we conducted the impact tests of sandstone at different impact velocities to collect the characteristics of the strain rate effect and obtained the typical dynamic constitutive curve of sandstone.The curve can be divided into an approximately linear elastic stage,aplastic stage,aplastic enhancement stage and a forward unloading stage.We constructed the dynamic damage constitutive model of sandstone adopting the combination model,and utilized the user subroutine UMAT interface of LS-DYNA to achieve the secondary development of the constitutive model,which was then used to simulate the SHPB dynamic impact compression tests of sandstone at four impact rates of 7.5,9.5,11.5 and 13.5 m/s.The calculation results showed that the as-constructed model gave a good description of the effect of the strain rate and the elastic stage of the stress-strain curve of sandstone.Moreover,the dynamic peak strength and maximum strain were in good agreement with the test results,and the relative errors of the strain rate,peak strength,maximum strain were less than 10%,thus indicating that the as-constructed dynamic constitutive model can accurately describe the dynamic mechanical properties of sandstone under impact.

关 键 词：岩石动力学 分离式霍普金森压杆 本构模型 损伤 

分 类 号：O317.3[理学—一般力学与力学基础]