Linearized theory of peridynamic states.

Silling, Stewart Andrew

关键词: ANGULAR MOMENTUM;    DEFORMATION;    ENERGY DENSITY;    INTEGRAL EQUATIONS;    STRAINS;    MATERIALS;    DYNAMICS;    MATHEMATICAL MODELS;    ELASTICITY Deformation-Analysis.;    Peridynamic formulation.;   

DOI  :  10.2172/959094
RP-ID  :  SAND2009-2458
PID  :  OSTI ID: 959094
Others  :  TRN: US201016%%35

学科分类：材料科学（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

A state-based peridynamic material model describes internal forces acting on a point in terms of the collective deformation of all the material within a neighborhood of the point. In this paper, the response of a state-based peridynamic material is investigated for a small deformation superposed on a large deformation. The appropriate notion of a small deformation restricts the relative displacement between points, but it does not involve the deformation gradient (which would be undefined on a crack). The material properties that govern the linearized material response are expressed in terms of a new quantity called the modulus state. This determines the force in each bond resulting from an incremental deformation of itself or of other bonds. Conditions are derived for a linearized material model to be elastic, objective, and to satisfy balance of angular momentum. If the material is elastic, then the modulus state is obtainable from the second Frechet derivative of the strain energy density function. The equation of equilibrium with a linearized material model is a linear Fredholm integral equation of the second kind. An analogue of Poincare's theorem is proved that applies to the infinite dimensional space of all peridynamic vector states, providing a condition similar to irrotationality in vector calculus.