Numerical Simulation On SHPB Experiment For Concrete

Firstly, the history and present state of the study on the dynamic compression mechanics properties of concrete were reviewed in this paper, and the problems of SHPB experimental technology and improved methods were summarized. Secondly, this paper gave a simple narrative for the principle of SHPB experimental and finite element theory.One of the focuses of this paper was discussed the numerical simulation technology, and solved the main problems in the process of contact collision, for example: algorithm selection, contact surface selection and the parameters of contact surface, etc.Numerical simulation of the problems of the experimental SHPB issues in this paper is the another focus. Main contents includes: Firstly, simulating the problems which may affect the SHPB experimental results, primarily specimen shape and size effect, and investigated the influence of reconstruction results from diameter and thickness variation. In addition, the specimen of hollow was simulated discussed the feasibility of its SHPB experimental. Secondly, The process of concrete damage was simulated. Simulating concrete damage under three strain rates and reconstructing stress-strain curve, the damage mechanism and patterns of concrete were discussed, and so did the effectiveness of several stages in the SHPB experiment. Thirdly, the influence of specimen flaw was simulated. Through the SHPB experiment with different parallelism tolerance of specimens were simulated, and then discussed the effectiveness of the SHPB experiment. Finally, the stress uniformity of concrete specimen under different strain rates was discussed. On this basis, the paper gave the reasonable numerical of the stress balance factor to measure the stress uniformity of concrete-like.