考虑端部摩擦约束的混凝土SHPB试验细观数值模拟  

Meso-level numerical simulation of SHPB tests with end friction confinement

作　　者：徐勇华[1] 浣石[1] 陶为俊[1] 聂忠纯[1] 

机构地区：[1]广州大学土木工程防护研究中心,广东广州510006

出　　处：《混凝土》2015年第2期39-42,共4页Concrete

基　　金：国家自然科学基金专项仪器基金(51227006)

摘　　要：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。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.

关 键 词：混凝土 SHPB 细观数值模拟 应力 应变 

分 类 号：TU528.01[建筑科学—建筑技术科学]