基于三维Hopkinson杆的混凝土动态力学性能研究

混凝土、岩石类材料在复杂应力状态下的动态力学性能研究一直备受关注，但鉴于动态实验的复杂性，对真三轴应力状态下材料的动态加载一直未曾实现。本文中研制了一套真三轴静载作用下混凝土、岩石类材料的“三维Hopkinson杆”动态力学实验系统，为冲击载荷作用下材料动态各向异性特性的研究提供了一种有效的实验测试技术。该系统采用液压伺服控制对立方体试件施加三向独立的0~100 MPa真三轴静载，再利用分离式Hopkinson压杆对试件施加冲击动载，具体研究了C30混凝土材料在不同真三轴静载条件下的动态压缩性能，得到了不同条件下X、Y、Z方向上的动态应力应变关系。

Dynamic behavior of concrete under static triaxial loading using 3D-Hopkinson bar

A type of 3D-Hopkinson bar dynamic testing system for investigating the dynamic behavior of concrete and rock under static triaxial loading was developed.The hydraulic servo control system employed in the testing system could provide independent triaxial pressure up to 100 MPa,and the split Hopkinson pressure bar employed in the impacting direction could provide dynamic loads.The dynamic responses on six faces of the cube specimen can be recorded by six bars in three dimensions,the lateral deformation states of the specimen under dynamic loading were obtained and analyzed by using this novelty Hopkinson bar.The dynamic compressive behaviors of C30 concrete under different static triaxial loading were investigated.