Numerical simulation of dynamic four-bending-tests using a modified Split Hopkinson Pressure Bar

Abstract

In this work, we present a three-dimensional full numerical simulation of the dynamic four-point bending test performed in a modified split Pressure Hopkinson Bar (SHPB). The study is mainly focused on the obtaining of the dynamic Stress Intensity Factor (SIF) from the displacement of the contact points between the specimen and the bars or, alternatively, from the Crack Mouth Opening Displacements (CMOD) assuming that the relationship between these variables and the SIF deduced for static conditions is applicable to the dynamic one. The results derived from the two analysed methods are compared with those obtained from the direct numerical calculation. We conclude that both procedures lead to adequate estimations of the temporal evolution of the SIF, although the best results are achieved through the CMOD. However, the application of this method requires more complex experimental equipment.