Author(s)

Y. Katz & A. Bussiba

Abstract

On the propensity to adiabatic shear, localized instability or microcracking onset Y. Katz & A. Bussiba ABSTRACT The current study objectives to develop aspects in materials characterized by progressive softening assisted by quasi-adiabatic effects. A fine scale phenom- enological approach was followed, demonstrated by single and polycrystalline materials with high and low crystal structures symmetry. Even under global quasi-static conditions, local dynamic effects control the microplastic features. This was investigated in the case of alternating ductile/brittle micro events in cubic crystals and in polycrystals characterized by slip/twinning deformation mechanisms. It was found that the propensity to inhomogeneous deformation or micro-band formation might indicate the early stages of macro-band triggering. The enhancement of flow localization, is originated by dislocation group dynamics or by a sudden singular stress field release due to microcrack formation. INTRO

Keywords