Abstract
Murr and Staudhammer have shown that the residual microstructure in shock loaded stainless steel contains increasing amounts of martensite as the pulse duration is increased at constant pressure. Ma and Murr have derived a simple expression for the so-called dynamic negative shear strain or dynamic back shear strain generated along the slip planes in a shock-loaded material of the form Es ≅ ΔP' Δt/2b, where ΔP' is related to the peak shock pressure and At is the shock pulse duration. The principles behind the theoretical development of this relationship also suggest that at a fixed pulse duration, the resultant dynamic back shear strain of a metal should not only be a function of pressure but also its magnitude will not be the same whether the metal is subjected to the fixed duration of shock stress continuously or intermittently. That is, if the total shock stress duration is divided into several subdurations, say t1 + t2 + t3, the term ΔP' Δt will not be equal to ΔP' (t1 + t2 + t3)even though Δt =(t1, t2, t3).
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