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Modelling of continuum damage for application elasto-viscoplastic Bodner-Partom constitutive equations

Ambroziak A.

Engineering Transactions

2007

Vol. 55, iss. 2

115-128

The aim of the paper is to propose an application of the continuum damage model proposed by Lemaitre to the elasto-viscoplastic constitutive equations of the Bodner-Partom model. The proposed approach has been implemented into subroutines of the FE code MSC.Marc as the user's viscoplastic subroutine UVSCPL and has been used to perform the FE numerical simulations. Comparison is given of the following two variants: 1) uniaxial creep test results for a nickel-based B1900+Hf superalloy at high temperatures and 2) calculation based on the constitutive equations with the inclusion of isotropic damage models.

The elasto- viscoplastic Chaboche model

Ambroziak A., Kłosowski P.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

2006

Vol. 10, No 1

49-61

The elasto-viseoplastie constitutive equations of the Chaboehe model [I] have been developed and modified many times. The aim of the present paper is to present the existing Chaboche model variants and describe its scientific and engineering applications. A compact review of literature on these applications is given, focussed on publications offering a wider and more comprehensive view of the elasto-viscoplastic Chaboche model. The article is an introduction to a comprehensive investigation of the elasto-viscoplastic Chaboche model.

Numerical simulation of finite deformations of a dynamically loaded elasto-viscoplastic circular membrane

Dornowski W.

Engineering Transactions

2003

Vol. 51, iss.1

63-85

The present paper deals with theoretical modeling and numerical simulation of a thin circular plate subjected to impulsive loading. To this end, the convective description is applied. The kinematical hypothesis used for theoretical description of the transient response includes membrane deformations only. This assumption is valid in the range of large deformations. The dynamical response of the material is described by Perzyna's elasto-viscoplastic constitutive relations. The theory is completed by an algorithm of the explicit finite difference method. With respect to the conditional stability of that method, the stability criterion is given. Basing on experimental data, an identification of material parameters is carried out. Some comparisons with the corresponding theoretical and experimental results are presented. Satisfactory agreement of the results has been found. Finally, an example of the plastic strain localization in a membrane is presented.