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Shock Compression of Ductile Polycrystals

  • John D. Clayton
Chapter
Part of the Shock Wave and High Pressure Phenomena book series (SHOCKWAVE)

Abstract

Modeling of shock compression of isotropic, polycrystalline elastic-plastic solids that deform by dislocation glide is undertaken. General governing equations are presented in forms referred to the thermoelastically unloaded intermediate configuration. Internal energy density of the material depends on a thermoelastic Eulerian strain tensor, entropy, and an internal state variable representative of dislocation density. Dislocation glide is incompressible, but inelastic volume changes arising from residual local strain fields and core effects of dislocations are captured. A numerical method is advanced for extracting inelastic constitutive response information from particle velocity histories of polycrystalline samples under planar shock loading. The only parameters entering the procedure are fundamental thermoelastic properties and assumed bounds on the fraction of plastic work corresponding to energy storage of generated dislocations in the lattice. Densities of statistically stored and geometrically necessary dislocations, in addition to shear stress, plastic strain, plastic strain rate, and temperature, are an outcome of the analysis. The model is implemented for polycrystalline aluminum and copper. Certain results are compared with others in the literature obtained under different kinematic and thermodynamic assumptions.

Keywords

Weak shock wave Polycrystal plasticity Thermodynamics Metals Third-order elasticity 

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© This is a U.S. government work and not under copyright protection in the U.S.; foreign copyright protection may apply 2019

Authors and Affiliations

  • John D. Clayton
    • 1
    • 2
  1. 1.Impact Physics CCRL-WMP-CUnited States Army Research LaboratoryAberdeenUSA
  2. 2.University of MarylandCollege ParkUSA

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