考虑端部摩擦约束的混凝土SHPB试验细观数值模拟

摘要

The commercial software LS-DYNA is used to carry out the numerical simulations of SHPB test,the mesoscale concrete specimens with distinctive modelling of mortar matrix,aggregates and interfacial transition zone( ITZ)are developed to numerically sim-ulate. And the end friction confinement is considered between specimen and bar interfaces. The numerical simulation reproduces the com-parison of failure process of concrete specimens,and the numerical simulation of stress-strain curves are in good agreement with experi-mental results. The simulation results also show that the ends friction does effect crack initiation and development. And the compressive strength of concrete is increased.%利用大型有限元软件LS-DYNA建立了包含骨料、砂浆和界面过渡区（ ITZ）的三相混凝土细观数值模型，并将端部摩擦约束加入模型中。模拟再现了混凝土试件的破坏过程，且模拟的应力-应变曲线与试验吻合较好。模拟结果还发现：在考虑了端部摩擦效应后，混凝土抗压强度有一定的提高，摩擦效应有效地抑制了裂纹的开展。