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Effective Fiber Properties to Incorporate Coating Thermoelastic Effects in Fiber/Matrix Composite Models
Author(s) -
Parthasarathy Triplicane A.,
Kerans Ronald J.,
Pagano Nicholas J.
Publication year - 1999
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1999.tb01804.x
Subject(s) - thermoelastic damping , materials science , composite material , fiber , composite number , transverse isotropy , matrix (chemical analysis) , coating , cracking , fiber pull out , isotropy , fiber reinforced composite , composite laminates , thermal , optics , physics , meteorology
A method to incorporate the thermoelastic effects of fiber coatings into models of fiber/matrix composites was deter‐mined. The coated fiber was replaced by an “effective” transversely isotropic fiber so that the properties of this effective fiber could be used in composite models. This ap‐proach was used to determine the magnitude of errors re‐sulting from neglect of the coatings in modeling fiber/matrix debonding and sliding and in reduction of data from real composites. The effects of carbon and BN coatings in the Nicalon/SiC system were found to be significant. It was found that significant errors could be expected from fitting models to experimental data if the compliance and coeffi‐cient of thermal expansion of the coatings were ignored, even when the coatings were thin. Wide use of the approach required revision of composite models to allow inclusion of a transversely isotropic fiber. Such a revision was de‐rived for a popular model of matrix cracking stress, and significant effects again were found to result from neglect of coatings.