数值模拟方法在采用Hopkinson压杆实验技术研究脆性材料动态特性中的应用

Split Hopkinson pressure bar experimental technique has been frequently used to research dynamic compressed property of brittle materials where pulse shaping technique is employed to improve the stress uniformity and maintain a nearly constant strain-rate in the specimen during the effective loading period. Numerical simulations was employed to research optimal parameters of pulse shaper and the effect of the pulse shaping technique on the SHPB tests of brittle material in the paper . It is found that axial strain-rate in different place of specimens is different even though the shaped incident stress pulse generates a nearly constant strain-rate in the reflected pulse in the SHPB test. It implies that the achievement of a nearly constant strain-rate in the reflected pulse in the SHPB test may not be equivalent to a nearly constant strain-rate in the SHPB specimen.