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Recent Developments in Dynamic Testing of Materials

Amos Gilat (Ohio State University), Jeremy Seidt (Ohio State University)

Symposium in honor of Rod Clifton on the occasion of his 75th Birthday

Mon 9:00 - 10:30

Salomon 101

Several new testing methods that have been recently developed for mechanical characterization of materials under dynamic loading are presented. The data from these tests is used for the development and calibration of material models for plasticity and failure. The first method is a shear test for sheet metals. The experiment is done by using a flat notched specimen in a tensile split Hopkinson bar apparatus (SHB). The shear strain is measured by using DIC within and on the boundary of the notch. The second development is a high strain rate tensile testing technique for Kevlar cloth and Kevlar yarn in a tensile SHB apparatus. The Kevlar cloth/yarn is attached to the bars by specially designed adaptors that keep the impedance constant. The third development is a dynamic load measurement of ballistic gelatin during impact. The experiment is done by impacting a gelatin projectile on an instrumented tube and measuring the waves in the tube.