One of the most important features of micromechanical models, with respect to other global approaches to fracture, is that progressive damage and failure can be described only by parameters characteristic of the material and not of the geometry. In spite of the large number of papers on micromechanical modeling presented in literature, a detailed assessment the geometry transferability of model parameters has been addressed in a limited number of works. In most of the cases, the model parameters transferability is analyzed only for one geometrical configuration other than that - usually a uniaxial tensile bar - on which the parameters set has been identified. In this paper, the continuum damage mechanics approach, as proposed by [Bonora, N., 1997. A non-linear CDM model for ductile failure. Engineering Fracture Mechanics 58, 11-28] is used to model ductile damage processes in ferritic steels. The geometry transferability of the damage parameters is demonstrated both in the range of low and high stress triaxiality. The possibility to accurately predict constraint effects on material crack resistance curve is demonstrated.

CDM modeling of ductile failure in ferritic steels: Assessment of the geometry transferability of model parameters

ESPOSITO, Luca;
2006

Abstract

One of the most important features of micromechanical models, with respect to other global approaches to fracture, is that progressive damage and failure can be described only by parameters characteristic of the material and not of the geometry. In spite of the large number of papers on micromechanical modeling presented in literature, a detailed assessment the geometry transferability of model parameters has been addressed in a limited number of works. In most of the cases, the model parameters transferability is analyzed only for one geometrical configuration other than that - usually a uniaxial tensile bar - on which the parameters set has been identified. In this paper, the continuum damage mechanics approach, as proposed by [Bonora, N., 1997. A non-linear CDM model for ductile failure. Engineering Fracture Mechanics 58, 11-28] is used to model ductile damage processes in ferritic steels. The geometry transferability of the damage parameters is demonstrated both in the range of low and high stress triaxiality. The possibility to accurately predict constraint effects on material crack resistance curve is demonstrated.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/595515
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