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Application of local damage models to the numerical analysis of ductile rupture

: Sun, D.-Z.; Voss, B.; Schmitt, W.; Siegele, D.

Fatigue and Fracture of Engineering Materials and Structures 12 (1989), No.3, pp.201-212
ISSN: 8756-758X
ISSN: 0160-4112
ISSN: 1460-2695
Journal Article
Fraunhofer IWM ()
constitutive relation; damage model; Gurson yield function; numerical simulation; prediction of the JR-curve; void growth and coalescence

Two damage models were implemented into the finite element program ADINA to study the correlation between microscopical damage and macroscopical material failure. In the first model based on the Gurson yield function the nucleation, the growth and the coalescence of voids were incorporated into the constitutive relations. In the second model the void growth was determined according to the Rice and Tracey model using the von Mises yield function and material failure was simulated by elimination of the elements where the critical void growth rate is exceeded. By accompanying experiments the numerical results were checked with regard to the local and global behaviour of the specimens. The transferability of the damage parameters were investigated by the variation of specimen geometries. Both damage models deliver qualitatively consistant results with respect to the influence of the stress triaxiality on the void growth and on the beginning of the material failure. However, the Gurson mode l is better applicable to the numerical simulation because after the onset of void coalescence the damage development and the stress drop are still continuous. On the basis of the Gurson model the J sub R-curve was estimated.