000014931 001__ 14931 000014931 005__ 20161115100206.0 000014931 04107 $$aeng 000014931 046__ $$k2016-08-21 000014931 100__ $$aKraiem, Omar 000014931 24500 $$aModelling the crushing behavior of a ceramic brittle foam 000014931 24630 $$n24.$$p24th International Congress of Theoretical and Applied Mechanics - Book of Papers 000014931 260__ $$bInternational Union of Theoretical and Applied Mechanics, 2016 000014931 506__ $$arestricted 000014931 520__ $$2eng$$aThis paper presents some experimental results and numerical computations carried out to model the quasi-static crushing behavior of an open-cell ceramic foam (OCCF). The aim was to identify a continuum model able to predict the mechanical response under complex compression loading paths. Different multiaxial compression tests have been performed to characterize the 3D-response of the material, which is slightly anisotropic, strongly non-linear and dependent on the compaction level. It has been shown that the Deshpande-Fleck (DF) yield criterion which depends on both the mean stress and the von Mises effective stress fit the experimental data well. The original DF model developed for foams has been modified by introducing a dependence of the plastic Poisson’s ratio with the plastic volumetric strain to improve the prediction of the radial expansion. It has been implemented into the finite-element code LS-Dyna via an usermat subroutine. Results of a simulation of a lab-scale shock absorber subjected to compression are in close agreement with the experimental results and validate the model robustness. 000014931 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb. 000014931 653__ $$a 000014931 7112_ $$a24th International Congress of Theoretical and Applied Mechanics$$cMontreal (CA)$$d2016-08-21 / 2016-08-26$$gICTAM2016 000014931 720__ $$aKraiem, Omar 000014931 8560_ $$ffischerc@itam.cas.cz 000014931 8564_ $$s139849$$uhttps://invenio.itam.cas.cz/record/14931/files/TS.FS09-2.03.pdf$$yOriginal version of the author's contribution as presented on CD, page 3434, code TS.FS09-2.03 . 000014931 962__ $$r13812 000014931 980__ $$aPAPER