Fracture mechanism of unidirectional carbon-fibre reinforced epoxy resin composite

The fatigue cracking characteristics of a unidirectional carbon-fiber reinforced epoxy resin composite (CFRP) were examined experimentally. Specimens 3- and 1-mm thick were subjected to three-point bending while being monitored for acoustic emissions (AE), using polarized transmission optical micros...

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Bibliographic Details
Published in:Journal of materials science 1986-03, Vol.21 (3), p.1005-1010
Main Authors: SATO, N, KURAUCHI, T, KAMIGAITO, O
Format: Article
Language:English
Subjects:
acoustic emissions
Applied sciences
carbon fibers
composite materials
crack propagation
Exact sciences and technology
failure
Forms of application and semi-finished materials
fracture
mechanisms
plastic deformation
Polymer industry, paints, wood
Reinforced plastics
scanning electron microscopy
Technology of polymers
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Summary:The fatigue cracking characteristics of a unidirectional carbon-fiber reinforced epoxy resin composite (CFRP) were examined experimentally. Specimens 3- and 1-mm thick were subjected to three-point bending while being monitored for acoustic emissions (AE), using polarized transmission optical microscopy, and by SEM techniques. Failure occurred in four stages: (1) fiber breaking at a load of 60 percent of the failure load; (2) plastic deformation at the broken fiber tip, along the fiber sides, then matrix cracking in the plastic region; (3) partial delamination just before failure; and (4) catastrophic crack propagation from the site of delamination. Plastic deformation of the matrix around the broken tip of a fiber was attributed to shear stress concentration. Low amplitude AE signals were highly correlated by fiber breaking and matrix cracking. Higher amplitude AE were associated with the onset of delamination. (M.S.K.)
ISSN:0022-2461
1573-4803
DOI:10.1007/BF01117386