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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 24
ADVANCES IN NON-LINEAR FINITE ELEMENT METHODS
Edited by: B.H.V. Topping and M. Papadrakakis
Paper VII.4

Coupling of a Micromechanically based Void Growth Model with a Macrocrack Model for the Simulation of Damage Evolution in Ductile Materials

C. Könke

Institute for Statics and Dynamics, Ruhr University Bochum, Bochum, Germany

Full Bibliographic Reference for this paper
C. Könke, "Coupling of a Micromechanically based Void Growth Model with a Macrocrack Model for the Simulation of Damage Evolution in Ductile Materials", in B.H.V. Topping, M. Papadrakakis, (Editors), "Advances in Non-Linear Finite Element Methods", Civil-Comp Press, Edinburgh, UK, pp 205-219, 1994. doi:10.4203/ccp.24.7.4
Abstract
This paper presents a way to simulate damage evolution for metal materials under large displacements and large deformations. The complete damage range is divided into a micro-damage and a macro-damage range. The micro-damage phase is described by the Cocks/Ashby void-growth model for isotropic, ductile materials under isothermal conditions. After reaching a critical void-volume fraction a macro crack is introduced into the model. Therewith it is possible to simulate damage evolution from nucleation and growth of first micro-voids to initiation of macro cracks and complete failure of the material. The Finite Element Method is used for the numerical formulation. For every incremental macro crack step a special mesh is constructed. Therewith the crack path remains independent of the initial FE-mesh.

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