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Stress mapping reveals extrinsic toughening of brittle carbon fiber in polymer matrix.

ABSTRACT: We conducted an in situ study on CFRP fracturing process using atomic-force-microscopy-based stress-sensitive indentation. Tensile stress distribution during fracture initiation and propagation was directly observed quantitatively. It led to a discovery that previously believed catastrophic fracture of individual carbon fiber develops in a controllable manner in the polymer matrix, exhibiting 10 times increase of fracture toughness. Plastic deformation in crack-bridging polymer matrix was accounted for the toughening mechanism. The model was applied to explain low temperature strength weakening of CFRP bulk material when matrix plasticity was intentionally 'shut down' by cryogenic cooling.

SUBMITTER: Wang H

PROVIDER: S-EPMC7269064 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature

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Stress mapping reveals extrinsic toughening of brittle carbon fiber in polymer matrix.

Wang Hongxin H Zhang Han H Goto Kenta K Watanabe Ikumu I Kitazawa Hideaki H Kawai Masamichi M Mamiya Hiroaki H Fujita Daisuke D

Science and technology of advanced materials 20200512 1

We conducted an in situ study on CFRP fracturing process using atomic-force-microscopy-based stress-sensitive indentation. Tensile stress distribution during fracture initiation and propagation was directly observed quantitatively. It led to a discovery that previously believed catastrophic fracture of individual carbon fiber develops in a controllable manner in the polymer matrix, exhibiting 10 times increase of fracture toughness. Plastic deformation in crack-bridging polymer matrix was accoun ...[more]

PMID: 32537033

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