Notch-Sensitivity of Fiber-Reinforced Ceramic-Matrix Composites: Effects of Inelastic Straining and Volume-Dependent Strength

Autor:	J. C. McNulty, Frank W. Zok, Anthony G. Evans, Guy M. Genin
Rok vydání:	2004
Předmět:	Materials science Constitutive equation Stress failure Ceramic matrix composite Finite element method High stress Nonlinear system visual_art Ultimate tensile strength Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Ceramic Composite material
Zdroj:	Journal of the American Ceramic Society. 82:1217-1228
ISSN:	1551-2916 0002-7820
Popis:	The effects of circular holes and sharp notches on the tensile strength of two Nicalon-reinforced ceramic composites have been investigated. The influence of inelastic straining on the redistribution of stress has been elucidated through measurements of the local strains in the regions of high stress concentration, coupled with finite element simulations of the test geometries, using a nonlinear constitutive law appropriate to ceramic composites. The scale dependence of strength has been inferred from tests performed on specimens of varying size. The utility of two failure models that incorporate both the inelastic straining and the scale dependence has been assessed: one based on the point stress failure criterion and the other on weakest-link fracture statistics. Both approaches provide a reasonably consistent description of the experimental measurements. Some of the implications and limitations associated with the failure models are discussed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a355bd68d37a0574c6c8a91318c71796 https://doi.org/10.1111/j.1151-2916.1999.tb01899.x Zobrazit plný text záznamu Plný text