NUMERICAL MODELLING OF WAVE SHAPES DURING SHPB MEASUREMENT

• Main Authors: Radim Dvořák, Petr Koudelka, Tomáš Fíla
• Format: Article
• Language: English
• Published: CTU Central Library 2019-12-01
• Series: Acta Polytechnica CTU Proceedings
• Subjects: shpb, pulse shaping, finite element method, explicit dynamics
• Online Access: https://ojs.cvut.cz/ojs/index.php/APP/article/view/6017

The paper aims at the numerical simulation of the wave propagation in compressive Split Hopkinson Pressure Bar (SHPB) experiment. The paper deals with principles of SHPB measurement, optimisation of a numerical model and techniques of pulse shaping. The parametric model of the typical SHPB configuration developed for LS-DYNA environment is introduced and optimised (in terms of element size and distribution) using the sensitivity study. Then, a parametric analysis of a geometric properties of the pulse shaper is carried out to reveal their influence on a shape of the incident pulse. The analysis is algorithmized including the pre- and post-processing routines to enable automated processing of numerical results and comparison with the experimental data. Results of the parametric analysis and the influence of geometric properties of the pulse shaper (diameter, length) on the incident wave are demonstrated.