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Fiber Debonding in Residually Stressed Brittle Matrix Composites
Author(s) -
Charalambides Panos G.
Publication year - 1990
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.1151-2916.1990.tb09812.x
Subject(s) - materials science , composite material , stress intensity factor , brittleness , delamination (geology) , fiber , phase (matter) , stress (linguistics) , stress field , thermal , fiber pull out , matrix (chemical analysis) , micromechanics , fracture mechanics , structural engineering , finite element method , composite laminates , composite number , paleontology , linguistics , chemistry , philosophy , physics , organic chemistry , biology , meteorology , subduction , tectonics , engineering
The competition between initial fiber debonding versus fiber failure marks a crucial event of the microstructural failure process in fiber‐reinforced brittle matrix composites. In this study, the role of a thermal residual stress field on the debonding conditions is examined theoretically and analytically. The analysis is based on two critical observations, the first being that the mechanics at the tip of a kink crack are driven only by the singularity at the main crack tip. Following from the first is the second observation that any thermal stress effects on the debonding criteria should enter only through the phase angle ψ T of the total stress intensity factor at the main crack tip. In general, this stress intensity factor has a thermal as well as a mechanical load contribution. It is shown that when the thermal and mechanical stress intensities, K R and K t , respectively, are in phase , i.e., ψ R =ψ t , the existing debonding conditions are universal and can be used even in the presence of thermal loads. On the contrary, when K R and K t are out of phase , i.e., ψ R ≠ψ t , events such as the delamination of thick films or debonding of inclined aligned fibers in brittle matrix composites become sensitive to the presence of the thermal stresses.