软材料和松散材料SHPB冲击压缩实验方法研究

针对采用SHPB装置研究泡沫等软材料和黄土、砂等松散介质的动态特性时存在的实验技术问题,提出利用钢套筒约束试件横向变形的方法,在SHPB冲击加载装置上实现材料准一维应变实验,研究了上述材料在准一维应变条件下的动态力学特性。本文同时指出,可以通过引入一约束系数描述试件一维应变条件的满足程度,并指出钢套筒的横向变形对实现试件一维应变的影响不大。在此基础上,进行了相关实验研究,说明了该实验技术能较好地满足软材料或松散介质力学性能研究工作的需要。

A Study on SHPB Method of Soft/Porous Materials

Aimed at the problems emerged in SHPB experiments when the dynamic behaviour of soft/porous materials,such as soil,sand and foam concrete are studied,a new technique is proposed.The basic idea of the new technique is to control the lateral deformation of the specimen with a steel tube and so the deformation of the specimen is confined in a state of one-dimensional deformation.A constant named as confined coefficient is introduced to describe the one-dimensional strain condition.Dynamic behaviours of soil,sand and foam concrete are studied with the new method and the results show that the method is a simple and effective technique in the study of dynamic performance of soft/porous materials.