Peer-Reviewed Journal Details
Mandatory Fields
Grogan, DM,Leen, SB,Semprimoschnig, COA,Bradaigh, CMO
2014
November
Composites Part A-Applied Science And Manufacturing
Damage characterisation of cryogenically cycled carbon fibre/PEEK laminates
Published
WOS: 13 ()
Optional Fields
Polymer-matrix composites (PMCs) Cryogenic cycling Transverse cracking Radiography FIBER PEEK COMPOSITES RESIDUAL-STRESSES THERMOPLASTIC COMPOSITES STACKING-SEQUENCE STITCH CRACKS PERMEABILITY FATIGUE LEAKAGE PLY DELAMINATION
66
237
250
A unique insight into damage formation in CF/PEEK laminates before, during and after cryogenic cycling, using optical microscopy and 3D X-ray computed tomography (CT), is presented. Thicker laminates were found to exhibit significantly greater microcrack density and delamination when compared to thinner laminates, with lay-up and material type also being important contributing factors. Thermal residual stress induced microcracking was also found in thicker laminates post-processing. 3D rendering software was used to prove the presence of through thickness crack networks within the laminates, as well as the extent of cracking through the specimen width. Crack opening in inner and off-axis ply groups was found to be significantly less than outer plies, implying the importance of these plies in limiting laminate permeability. The presence of voids was found to influence crack nucleation and growth paths within the laminates, with full void volume characterisation presented. (C) 2014 Elsevier Ltd. All rights reserved.
10.1016/j.compositesa.2014.08.007
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