Effect of Constitutive Modelling on the Dynamic Development of Shear Bands in Viscoplastic Materials

Abstract

We model the viscoplastic response of a HY-100 steel by a Power law, and flow rules proposed by Litonski, Bodner and Partom, and Johnson and Cook. Each of these flow rules is first calibrated by using the torsional test data at a strain-rate of 3,300 sec(-1). These material models are then used to study the thermomechanical deformations of a block made of the HY-100 steel and undergoing simple shearing deformations at a nominal strain-rate of 5000 sec(-1). A material defect is simulated by assuming a non-uniform initial temperature distribution within the block. Whereas all of the flow rules used predict a rapid drop of the shear stress as a shear band forms, only for the Litonski Law for nonpolar materials, does an unloading elastic wave amanate outwards from the shear bands. (jg)

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1990
Accession Number
ADA220443

Entities

People

  • C. H. Kim
  • R. C. Batra

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Boundaries
  • Boundary Value Problems
  • Elastic Properties
  • Elastic Waves
  • Equations
  • Finite Element Analysis
  • Mechanics
  • Military Research
  • Particles
  • Perturbations
  • Procurement
  • Shear Bands
  • Shear Stresses
  • Softening
  • Strain Hardening
  • Stress Strain Relations
  • Waves

Readers

  • Materials Science (Mechanical Engineering).
  • Mechanical Engineering/Mechanics of Materials.