Abstract
The aim of this work is to extend Gurson’s model for plastic porous materials by considering the effects of void shape and heterogeneous hardening, which are both important for cyclic ductile failure at low stress triaxiality. The derivation is based on a sequential limit-analysis of an ellipsoidal cell made of a rigid-hardenable material and containing an ellipsoidal confocal cavity. The heterogeneous distribution of hardening is accounted for by considering a finite number of ellipsoidal layers in which the parameters related to isotropic and kinematic hardening are considered as homogeneous. Several approximations of the macroscopic plastic dissipation lead to an approximate yield criterion based on Madou and Leblond (2012a) solution. Evolution equations of the internal parameters (hardening and geometric parameters) are then derived to complement the yield criterion. Finally, the yield locus is assessed using numerical limit-analysis in a typical case of an ellipsoidal cavity with several distributions of pre-hardening.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
