Fracture process of thermally shocked discontinuous fibre-reinforced glass matrix composites under tensile loading |
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Authors: | K Ogi N Takeda K M Prewo |
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Affiliation: | (1) Research Institute for Applied Mechanics, Kyushu University, 6-1 Kasuga-Koen, Kasuga City Fukuoka 816, Japan;(2) Center for Collaborative Research, The University of Tokyo, 4-6-1 Komaba, Meguro-ku Tokyo 153, Japan;(3) United Technologies Research Center, East Hartford, CT 06108, USA |
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Abstract: | Fracture mechanisms of discontinuous carbon-fibre-reinforced glass matrix composites were experimentally studied for specimens
with initial damage induced by thermal shock. First, matrix cracking due to thermal shock was observed using both optical
microscopy and scanning acoustic microscopy (SAM) to reveal the damage state. Secondly, tensile stress-strain behaviour and
acoustic emission during tensile tests were measured for specimens with and without thermal shock. The progress of microscopic
damage during tensile loading was also investigated using both replica and in-situ SAM techniques. Finally, macroscopic transient
thermal stresses during thermal shock were calculated using finite-element analysis. It is proved that the fracture process
of the composite specimen with thermal-shock-induced cracks is different from that of the virgin specimen. This difference
in fracture processes is attributed to the difference in the evolution of matrix cracking, which is affected by pre-existing
microcracks in the matrix.
This revised version was published online in November 2006 with corrections to the Cover Date. |
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