Borino, G.; Fuschi, P.; Polizzotto, C. Elastic-plastic-damage constitutive models with coupling internal variables. (English) Zbl 0860.73046 Mech. Res. Commun. 23, No. 1, 19-28 (1996). The paper describes the elastic-plastic damage constitutive behaviour by use of coupling internal variables. This approach has several consequences on the description of the material behaviour: (i) the tangent stiffness matrix is symmetric; (ii) the softening behaviour can be reproduced as a consequence of the material degradation due to the damage, rather than a “negative” hardening; (iii) anisotropic elastic degradation can be accounted for by properly defining the material free energy parameters; (iv) it is possible to account for the stress relaxation phenomenon exhibited by a bar specimen subjected to strain-driven load cycles. The validity of the proposed material model is indicated by simple results, relative to uniaxial stress states. Reviewer: O.Simionescu (Bucureşti) Cited in 4 Documents MSC: 74R99 Fracture and damage 74C99 Plastic materials, materials of stress-rate and internal-variable type Keywords:tangent stiffness matrix; softening behaviour; material degradation; free energy parameters; stress relaxation PDFBibTeX XMLCite \textit{G. Borino} et al., Mech. Res. Commun. 23, No. 1, 19--28 (1996; Zbl 0860.73046) Full Text: DOI