Biaxial Testing of Sheet Materials at High Strain Rates Using Viscoelastic Bars

被引：0
作者：
V. Grolleau
G. Gary
D. Mohr
机构：
[1] Université de Bretagne Sud,Laboratoire Génie Mécanique et Matériaux
[2] École Polytechnique,Solid Mechanics Laboratory (CNRS
[3] Massachusetts Institute of Technology,UMR 7649), Department of Mechanics
来源：
Experimental Mechanics | 2008年 / 48卷
关键词：
Bulge test; Biaxial experiments; Rate-dependent plasticity; Split Hopkinson pressure bar apparatus; High strain rates;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
A dynamic bulge testing technique is developed to perform biaxial tests on metals at high strain rates. The main component of the dynamic testing device is a movable bulge cell which is directly mounted on the measuring end of the input bar of a conventional split Hopkinson pressure bar system. The input bar is used to apply and measure the bulging pressure. The experimental system is analyzed in detail and the measurement accuracy is discussed. It is found that bars made of low impedance materials must be used to achieve a satisfactory pressure measurement accuracy. A series of dynamic experiments is performed on aluminum 6111-T4 sheets using viscoelastic nylon bars to demonstrate the capabilities of the proposed experimental technique. The parameters of the rate-dependent Hollomon–Cowper–Symonds J2 plasticity model of the aluminum are determined using an inverse analysis method in conjunction with finite element simulations.
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