Failure Modes and Toughening Mechanisms in CMC

by V. S. Gopalaratnam, Univ of Missouri-Columbia, Columbia, United States,
Lan Meng, Univ of Missouri-Columbia, Columbia, United States,



Document Type: Proceeding Paper

Part of: Mechanics Computing in 1990's and Beyond

Abstract:

The paper reports results from stable flexural and tension tests conducted at room temperature on plain matrix and ceramic matrix composite (CMC) specimens. The flexural tests were conducted under direct specimen deflection controlled conditions while the uniaxial tension tests were conducted under specimen strain controlled conditions. The composites were made using MAS corderite matrix and SiC fibers. In addition to continuous records of the important test parameters (load, deformation, strain), microscopic observations during the test enabled a study of the failure modes and toughening mechanisms in such composites. Preliminary results from these tests are presented and discussed. Among the major sources of toughening observed in the these tests are matrix fracture, crack deflection, interfacial debonding, delamination, fiber fracture and fiber pull-out.

Subject Headings: Composite materials | Ceramics | Material failures | Laminated materials | Matrix (mathematics) | Material tests | Failure modes

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