Micromechanics of compressive fracture in particulate reinforced ceramics.
Laird-G II; Kennedy-TC
Proc 16th Ann Conf on Composites & Adv Cer Mat Am Ceram Soc Westerville Ohio, :107-120
SiC, Si3N4, and m-glass reinforced with TiB2, SiC, and Ni, respectively, were modeled using finite element analysis. Debonding between the matrix and particle was assumed; interfacial friction was modeled with friction coefficients (u) from 0.0 to 0.25. Stress intensity factors (k1) were calculated for an annular crack parallel to compressive loading. Numerical results showed that with a frictionless interface, stiff particles tended to force open the crack. Conversely, with u = 0.1 and 0.2, The crack flanks were restrained against the particle and k1 was decreased at the crack tip. This toughening effect was more pronounced as the elastic moduli mismatch was increased.
Proc 16th Ann Conf on Composites & Adv. Cer. Mat.; Am. Ceram. Soc., Westerville, OH, Pp 107-120