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Ductile damage and fragmentation of highly porous gamma-alumina under multi-point crushing

Abstract : Mechanical behavior of highly porous alumina catalytic supports is investigated through a non-conventional approach consisting in a multi-point crushing of individual cylindrical extrudates. A ductile behavior characterized by irreversible deformation and fragmentation phenomena is observed and pointed out by experimental load-displacement curves. SEM fractographies of the fragments collected after the tests confirm the presence of dense micro-cracking and of local deformations under contact zones. A Finite Element analysis of the test shows that a Drucker-Prager strength criterion associated with a perfectly plastic flow rule mimics the global damageable behavior of the specimen under the multi-point crushing test. A correlation is proposed between the evolution of the mass of fine fragments and the plastic energy dissipation.
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Submitted on : Thursday, November 12, 2020 - 4:26:50 PM
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Ductile Damage and Fragmentati...
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Vincent Le Corre, Lina Jolivet, Soline Mathevet, Carole Bobin, Meille Sylvain. Ductile damage and fragmentation of highly porous gamma-alumina under multi-point crushing. Ceramics International, Elsevier, 2020, 46 (16), pp.25584-25592. ⟨10.1016/j.ceramint.2020.07.030⟩. ⟨hal-03002067⟩



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