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Ductile damage analysis of elasto-plastic shells at large inelastic strains
The objective of this contribution is to model ductile damage phenomena under consideration of large inelastic strains, to couple the corresponding constitutive law with a multi-layer shell kinematics and to give finally an adequate finite element formulation. An elastic-plastic constitutive law is formulated by using a spatial hyperelasto-plastics formulation based on the multiplicative decomposition of the deformation gradient. To include isotropic ductile damage the continuum damage model of Rousselier is modified so as to consider large strains and additionally extended by various void nucleation and macro-crack criteria. In order to achieve numerical efficiency, elastic strains are supposed to be sufficiently small providing a numerical effective integration based on the backward Euler rule. Finite element formulation is enriched by means of the enhanced strain concepts. Thus the well-known deficiencies due to incompressible deformations and the inclusion of transverse strains are avoided. Several examples are given to demonstrate the performance of the algorithms developed concerning large inelastic strains of shells and ductile damage phenomena.
Ductile damage analysis of elasto-plastic shells at large inelastic strains
The objective of this contribution is to model ductile damage phenomena under consideration of large inelastic strains, to couple the corresponding constitutive law with a multi-layer shell kinematics and to give finally an adequate finite element formulation. An elastic-plastic constitutive law is formulated by using a spatial hyperelasto-plastics formulation based on the multiplicative decomposition of the deformation gradient. To include isotropic ductile damage the continuum damage model of Rousselier is modified so as to consider large strains and additionally extended by various void nucleation and macro-crack criteria. In order to achieve numerical efficiency, elastic strains are supposed to be sufficiently small providing a numerical effective integration based on the backward Euler rule. Finite element formulation is enriched by means of the enhanced strain concepts. Thus the well-known deficiencies due to incompressible deformations and the inclusion of transverse strains are avoided. Several examples are given to demonstrate the performance of the algorithms developed concerning large inelastic strains of shells and ductile damage phenomena.
Ductile damage analysis of elasto-plastic shells at large inelastic strains
Eckstein, A. (author) / Basar, Y. (author)
International Journal for Numerical Methods in Engineering ; 47 ; 1663-1687
2000
25 Seiten, 77 Quellen
Article (Journal)
English
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