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On the Extension of Creep-Damage Theories for Isotropic Materials to the Case of Anisotropic Materials

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Part of the Lecture Notes in Applied and Computational Mechanics book series (LNACM, volume 9)

Abstract

For many applications the isotropic creep-damage description of the material behaviour at elevated temperatures, but moderate and approximately constant loading conditions is accurate enough for the life-time estimation and the prediction of the macroscopic failure initiation. In contrast, from tests it is known that for various materials the creepdamage process is anisotropic from the beginning even in the case of initially isotropic materials. Due to this fact anisotropic creep-damage models must be developed.

Various possibilities of the extension isotropic creep-damage models to the case of anisotropic materials are presented in the literature. Firstly, the extension of the classical Kachanov-Rabotnov concept will be introduced. This model can be used if the material behaviour is the same for tensile and compressive loading states. Since some materials show a behaviour depending on the stress state so-called non-classical models can be formulated. The second part is devoted to other concepts in anisotropic creep-damage modelling.

Keywords

Anisotropic creep damage induced anisotropy stress-state dependent material behaviour 

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© Springer-Verlag Berlin Heidelberg 2003

Authors and Affiliations

  1. 1.Lehrstuhl für Technische Mechanik, Fachbereich IngenieurwissenschaftenMartin-Luther-Universität Halle-WittenbergGermany

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