A ductile damage criterion at various stress triaxialities

Author(s)

Bruenig, Michael ^[1] ; Chyra, Oliver ^[1] ; Albrecht, Daniel ^[1] ; Driemeier, Larissa ^[2] ; Alves, Marcilio ^[2]

Affiliation

^[1] Tech Univ Dortmund, Lehrstuhl Baumech Stat, D-44221 Dortmund - Germany

^[2] Univ Sao Paulo, Grp Solid Mech & Struct Impact, Dept Mechatron & Mech Syst Engn, BR-05508900 Sao Paulo - Brazil

• Document type: Journal article
• Source: INTERNATIONAL JOURNAL OF PLASTICITY; v. 24, n. 10, p. 1731-1755, OCT 2008.
• Web of Science Citations: 147

Abstract

The paper discusses the effect of stress triaxiality on the onset and evolution of damage in ductile metals. A series of tests including shear tests and experiments oil smooth and pre-notched tension specimens wits carried Out for it wide range of stress triaxialities. The underlying continuum damage model is based oil kinematic definition of damage tensors. The modular structure of the approach is accomplished by the decomposition of strain rates into elastic, plastic and damage parts. Free energy functions with respect to fictitious undamaged configurations as well as damaged ones are introduced separately leading to elastic material laws which are affected by increasing damage. In addition, a macroscopic yield condition and a flow rule are used to adequately describe the plastic behavior. Numerical simulations of the experiments are performed and good correlation of tests and numerical results is achieved. Based oil experimental and numerical data the damage criterion formulated in stress space is quantified. Different branches of this function are taken into account corresponding to different damage modes depending oil stress triaxiality and Lode parameter. In addition, identification of material parameters is discussed ill detail. (C) 2007 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 04/15404-0 - Structural impact
• Grantee: Marcílio Alves
• Support Opportunities: Research Projects - Thematic Grants