The strain rate behavior of iron in pure shear

Abstract

An experimental study of the strain rate behavior of technically pure iron in pure shear is reported in this work. As is well known, most experimental results have been obtained from tension or compression tests; few results on strain rate behavior in pure shear.Furthermore, dynamic tests on thin tubular specimens show several advantages over tension or compression tests.Neglecting strain rate history effects the surface τ = τ(φ, gh) has been experimentally obtained, where τ is the shear stress, φ and η are the shear strain and strain rate respectively. This surface was obtained over the following ranges of strain and strain rate 0 ⩽ φ ⩽ 0.42; 1 × 10−5sec−1 ⩽ η ⩽ 1 × 102sec−1.In addition, a comparison between the effect of strain rate in pure shear, tension and compression tests has been carried out. This comparison enables preliminary data on the strain rate behavior in biaxial states of stress to be obtained.Finally, the basic assumptions of the visco-plasticity theory for complex states of stress have been examined in the light of this experimental evidence.