Experimental simulation of matrix cracking and debonding in a model brittle matrix composite |
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Authors: | M E Walter G Ravichandran |
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Institution: | (1) Applied Mechanics Program, The Ohio State University, 43210-1181 Columbus, OH;(2) California Institute of Technology, MS: 105-50, 91125 Pasadena, CA |
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Abstract: | A model composite material system was designed to simulate typical damage mechanisms in unidirectional fiber reinforced brittle
matrix composites. Experiments were performed at low to high quasistatic, macroscopic loading rates
. At all loading rates reversal of the transverse strain was observed and was correlated to matrix cracking and debonding.
The optical method of coherent gradient sensing (CGS) was used to obtain qualitative information regarding the stress fields
and to observe the progression of damage. It was found that the sequence of damage formation (damage path) depended on the
macroscopic loading rate. At lower loading rates periodic matrix cracks developed; minimal debonding of the reinforcement-matrix
interface occurred only much later in the experiment. At higher loading rates extensive debonding followed propagation of
the initial matrix crack, and periodic cracking was not observed. Several features of the material response of the model material
system were also observed in a previously studied unidirectional ceramic matrix composite. |
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Keywords: | Model brittle matrix composite coherent gradient sensing debonding matrix cracking rate dependent damage process |
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