Chapter Ten - Adiabatic shearing and dynamic evolution of meso-damage

Abstract

From mesoscopic view, dynamic failure of materials is essentially a time evolution process of meso-damage in different forms (e.g., meso-crack, meso-void, and meso-shear band) evolving at a finite rate, regardless it is dominated by what kind of physical mechanism. In this chapter, the dynamic failure is discussed centering on adiabatic shearing firstly, as one of the most typical forms of meso-damage. The attention is focused on the microstructure of adiabatic shear band, its strain and strain rate relativity, its temperature relativity, and the corresponding macroscopic constitutive instability criteria for adiabatic shearing. Moreover, the interaction between adiabatic shear band and crack is discussed. Then, the dynamic evolution law of meso-damage in general form is further discussed. Finally, the related problem of rate-dependent constitutive relation taking account of dynamic damage evolution is discussed.