Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7178574 | Mechanics of Materials | 2018 | 37 Pages |
Abstract
We present here a new methodology to measure the strength of materials at very high strain rates, up to 7.5â
104Â sâ1, using magnetically driven expanding cylinder experiments. We use a pulse current generator (PCG) to apply magnetic forces on hollow cylindrical specimens and measure the expanding motion using velocity interferometery. To investigate the dynamic behavior of the specimens and their strength, we use numerical simulations. 2D hydrodynamic simulations were conducted for the design of the specimens, and 1D MHD simulations for simulating the actual tests. In this work, we present results for nine EM driven OFHC cylinders, reaching strain rates up to 7.5â
104Â sâ1. We report a significant strain rate hardening for the OFHC copper and provide a calibrated Modified Johnson Cook (MJC) constitutive model for our data in the regime ranging from 103Â sâ1 (Kolsky bar tests) up to 105Â sâ1, from the PCG tests. It is believed that the methodology that is presented here will open the way for very high strain-rate characterization of metallic materials.
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Physical Sciences and Engineering
Engineering
Mechanical Engineering
Authors
E. Avriel, Z. Lovinger, R. Nemirovsky, D. Rittel,