AN ANALYSIS OF STRESS UNIFORMITY FOR VISCOELASTIC MATERIALS DURING SHPB TESTS
AbstractBY USING CHARACTERISTICS METHOD OF VISCOELASTIC WAVE PROPAGATION, THE SHPB TESTS FOR THE VISCOELASTIC MATERIALS ARE NUMERICALLY STUDIED IN THE PRESENT PAPER TO SEE HOW THE BASIC ASSUMPTION OF UNIFORM DISTRIBUTION OF STRESS ALONG THE THICKNESS OF SPECIMEN CAN BE SATISFIED. IT IS FOUND THAT THE MATERIAL PARAMETERS SUCH AS THE RELAXATION TIME ÂΜ2 DESCRIBING THE HIGH STRAIN-RATE RESPONSE, THE INSTANTANEOUS WAVE IMPEDANCE RATIO RI, AND THE RISE-TIME OF INCIDENT WAVE ALL MARKEDLY INÂ°UENCE THE STRESS UNIFORMITY, THE STRAIN UNIFORMITY AND THE AVERAGE STRAIN RATE OF THE SPECIMEN TESTED. THE RESULTS OF THIS STUDY MAY PROVIDE USEFUL THEORETICAL SUPPORT FOR THE DESIGN OF A DYNAMIC SHPB TEST FOR VISCOELASTIC MATERIALS.
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