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

Vincent Le Corre (1) , Lina Jolivet (1, 2) , Soline Mathevet (1, 2) , Carole Bobin (1) , Meille Sylvain (2)

1 IFPEN - IFP Energies nouvelles
2 INSA Lyon - Institut National des Sciences Appliquées de Lyon

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.

Keywords: Porous ceramics; yield strength; fragmentation pattern; fractography; Finite Element model; Drucker-Prager criterion

Domains: Chemical Sciences

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, 2020, 46 (16), pp.25584-25592. ⟨10.1016/j.ceramint.2020.07.030⟩. ⟨hal-03002067⟩