Accession Number : ADA180886
Title : Some Aspects of Adiabatic Shear Bands.
Descriptive Note : Technical rept.,
Corporate Author : ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
Personal Author(s) : Wright,Thomas W.
Report Date : MAR 1987
Pagination or Media Count : 32
Abstract : A one-dimensional continuum formulation for the initiation and growth of adiabatic shear bands is reviewed, including some remarks on the underlying assumptions. A short description of some perturbation calculations introduces the idea of stress collapse and band formation as a bifurcation from homogeneous deformation, and an approach for estimating the critical time of collapse for infinitesimal perturbations is introduced. Steady solutions are exhibited and their interpretation as central boundary layers is suggested. Finally it is shown that in a certain limit shear bands occur following a hyperbolic to elliptic transition in the governing equation, and in a concluding remark dipolar plasticity is introduced as a possible alternative continuum description.
Descriptors : *PLASTIC PROPERTIES, *BANDS(STRIPS), *SHEAR PROPERTIES, ADIABATIC CONDITIONS, BOUNDARY LAYER, COLLAPSE, COMPUTATIONS, DEFORMATION, DIPOLES, ELLIPSES, FORMULATIONS, HOMOGENEITY, HYPERBOLAS, ONE DIMENSIONAL, PERTURBATIONS, SOLUTIONS(GENERAL), STEADY STATE, STRESSES, TIME, TRANSITIONS, FINITE ELEMENT ANALYSIS, DIPOLE MOMENTS
Subject Categories : Mechanics
Distribution Statement : APPROVED FOR PUBLIC RELEASE