A theory for the isolation of the complex deformation characteristics of nonlinear viscoelastic materials

Holmes, D.W., and Loughran, J.G. (2007) A theory for the isolation of the complex deformation characteristics of nonlinear viscoelastic materials. ANZIAM Journal, 48. pp. 645-660.

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Abstract

This article reports on the development of a new numerical method for the separation of multiple interdependent nonlinear deformation phenomena. Whilst conceivably applicable to other classes on nonlinear materials, the method proposed was developed specifically for large strain nonlinear viscoelasticity. Characterized by a combination of elastic and viscous deformation contributions, the corresponding constitutive relationships become experimentally indeterminate when both components of response are nonlinearly interdependent. The theory presented here incorporates a methodology analogous to Closest Point Projection of computational plasticity which is used like a Newton type iterative solution for multiple, mutually dependent parameters. The proposed technique is shown to closely reproduce the results seen from numerical simulations given prescribed nonlinear elastic and viscous relationships. This is of particular benefit to the accurate determination of material model coefficients.

Item ID: 2257
Item Type: Article (Refereed Research - C1)
Keywords: finite element; elasto-viscoelastic; viscoplastic; mechanical testing; stress isolation; back stress; isotropic & kinematic hardening
ISSN: 1446-8735
Date Deposited: 29 May 2009 04:52
FoR Codes: 09 ENGINEERING > 0913 Mechanical Engineering > 091399 Mechanical Engineering not elsewhere classified @ 100%
SEO Codes: 87 CONSTRUCTION > 8703 Construction Materials Performance and Processes > 870302 Metals (e.g. Composites, Coatings, Bonding) @ 100%
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