Article

Journal of Elasticity

, Volume 88, Issue 2, pp 151-184

Peridynamic States and Constitutive Modeling

  • S. A. SillingAffiliated withMultiscale Dynamic Material Modeling Department, Sandia National Laboratories Email author 
  • , M. EptonAffiliated withMath Group, The Boeing Company
  • , O. WecknerAffiliated withMath Group, The Boeing Company
  • , J. XuAffiliated withMath Group, The Boeing Company
  • , E. AskariAffiliated withMath Group, The Boeing Company

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Abstract

A generalization of the original peridynamic framework for solid mechanics is proposed. This generalization permits the response of a material at a point to depend collectively on the deformation of all bonds connected to the point. This extends the types of material response that can be reproduced by peridynamic theory to include an explicit dependence on such collectively determined quantities as volume change or shear angle. To accomplish this generalization, a mathematical object called a deformation state is defined, a function that maps any bond onto its image under the deformation. A similar object called a force state is defined, which contains the forces within bonds of all lengths and orientation. The relation between the deformation state and force state is the constitutive model for the material. In addition to providing a more general capability for reproducing material response, the new framework provides a means to incorporate a constitutive model from the conventional theory of solid mechanics directly into a peridynamic model. It also allows the condition of plastic incompressibility to be enforced in a peridynamic material model for permanent deformation analogous to conventional plasticity theory.

Keywords

Peridynamic Material model Constitutive model Nonlocal elasticity Fracture Plastic flow

Mathematics Subject Classifications (2000)

74A05 74A20