In situ synchrotron tomographic evaluation of the effect of toughening strategies on fatigue micromechanisms in carbon fibre reinforced polymers
In situ synchrotron tomographic evaluation of the effect of toughening strategies on fatigue micromechanisms in carbon fibre reinforced polymers
Micromechanisms of fatigue failure in double-notch cross-ply carbon/epoxy coupons have been investigated using synchrotron radiation computed tomography (SRCT). The fatigue behaviour of toughened and untoughened matrices has been compared, highlighting similarities and differences of damage modes in terms of fatigue initiation and propagation. Results show that damage does not propagate evenly for the toughened systems: the presence of resin rich regions constrains crack propagation, which is shown to suppress damage growth. In contrast, untoughened material is characterized by more uniform crack progression. The presence of toughening particles in the resin system favours complex local crack geometries, such as crack deflection and the formation of bridging ligaments along the crack wake due to particle debonding events. A distinctive aspect of fatigue loading is identified in the degradation of crack bridging ligaments associated with increasing number of cycles
carbon fibres, fracture toughness, fatigue, micromechanisms, non-destructive testing X-ray computed tomography
32-39
Garcea, S.C.
835ab8bc-a234-4fbd-83e3-4f4fe9ca22bf
Sinclair, I.
6005f6c1-f478-434e-a52d-d310c18ade0d
Spearing, S.M.
9e56a7b3-e0e8-47b1-a6b4-db676ed3c17a
10 March 2015
Garcea, S.C.
835ab8bc-a234-4fbd-83e3-4f4fe9ca22bf
Sinclair, I.
6005f6c1-f478-434e-a52d-d310c18ade0d
Spearing, S.M.
9e56a7b3-e0e8-47b1-a6b4-db676ed3c17a
Garcea, S.C., Sinclair, I. and Spearing, S.M.
(2015)
In situ synchrotron tomographic evaluation of the effect of toughening strategies on fatigue micromechanisms in carbon fibre reinforced polymers.
Composites Science and Technology, 109, .
(doi:10.1016/j.compscitech.2015.01.012).
Abstract
Micromechanisms of fatigue failure in double-notch cross-ply carbon/epoxy coupons have been investigated using synchrotron radiation computed tomography (SRCT). The fatigue behaviour of toughened and untoughened matrices has been compared, highlighting similarities and differences of damage modes in terms of fatigue initiation and propagation. Results show that damage does not propagate evenly for the toughened systems: the presence of resin rich regions constrains crack propagation, which is shown to suppress damage growth. In contrast, untoughened material is characterized by more uniform crack progression. The presence of toughening particles in the resin system favours complex local crack geometries, such as crack deflection and the formation of bridging ligaments along the crack wake due to particle debonding events. A distinctive aspect of fatigue loading is identified in the degradation of crack bridging ligaments associated with increasing number of cycles
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Accepted/In Press date: 18 January 2015
Published date: 10 March 2015
Keywords:
carbon fibres, fracture toughness, fatigue, micromechanisms, non-destructive testing X-ray computed tomography
Organisations:
Engineering Science Unit
Identifiers
Local EPrints ID: 383508
URI: http://eprints.soton.ac.uk/id/eprint/383508
ISSN: 0266-3538
PURE UUID: 5155bf20-0725-4597-b48c-659c2281b70b
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Date deposited: 16 Nov 2015 08:34
Last modified: 15 Mar 2024 03:18
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Author:
S.C. Garcea
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