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- W3148421312 abstract "The purpose of this thesis is to contribute to study of ductile fracture of materials on micromechanical models based on local approach. Ductile fracture of metals occurs mainly by nucleation, growth and coalescence of voids. Concerning local approach of ductile fracture, emphasis is laid on micromechanical model of Rice-Tracey. The latter based on growth cavities is verified in order to describe ductile tearing in stainless steel NiCr(12NC6), 2024T351 aluminium alloy and polymer PA66. The experimental study is carried out on compact tension ct , central crack panel ccp, single edge notched tension sent and tensile axisymetric notched specimens to characterize ductile failure in different materials. The comparison of experimental results with classical Rice-Tracey model shows that it cannot make a good prediction using -da curve. On basis of fitting procedure and numerical simulation a correction of coefficients is introduced to improve Rice-Tracey model. A methodology of identification of parameters is presented. Ductile crack growth, defined by the j -da curve, has been correctly simulated using numerical calculations by adjusting three parameters of modified Rice-Tracey model in calibration procedure. The proposed model is implemented into a finite element code. Close agreement between computed results aj'ld experimentally measured values justifies usefulness of present modified model." @default.
- W3148421312 created "2021-04-13" @default.
- W3148421312 creator A5066867326 @default.
- W3148421312 date "2008-07-04" @default.
- W3148421312 modified "2023-09-24" @default.
- W3148421312 title "Étude de la déchirure ductile basée sur un modèle de croissance de cavités" @default.
- W3148421312 hasPublicationYear "2008" @default.
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