Premium
Damage Models for Monotonous and Cyclic Loading
Author(s) -
Brocks W.,
Steglich D.
Publication year - 2002
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/1617-7061(200203)1:1<195::aid-pamm195>3.0.co;2-w
Subject(s) - materials science , von mises yield criterion , damage mechanics , hydrostatic stress , structural engineering , constitutive equation , void (composites) , yield surface , mechanics , plasticity , porosity , composite material , finite element method , engineering , physics
Constitutive models for describing damage evolution in ductile materials have found increasing application, mainly the micromechanical model by Gurson , Tvergaard and Needleman , and a continuum damage mechanics approach by Rousselier . Both models modify the von Mises yield potential by incorporating the effects of the hydrostatic stress and damage. The latter is introduced by means of a single scalar damage quantity, the porosity or void volume fraction, which acts as an internal variable aditionally to the plastic equivalent strain. Several examples for the capabilities of these models beyond common applications are given. In particular, their ability to represent cup‐cone fracture of round bars and shear fracture of plane strain specimens as well as their behaviour under cyclic loading are studied.