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Rapidly cured out-of-autoclave laminates: understanding and controlling the effect of voids on laminate fracture toughness

Agius, S. L. and Fox, B. L. 2015, Rapidly cured out-of-autoclave laminates: understanding and controlling the effect of voids on laminate fracture toughness, Composites part a: applied science and manufacturing, vol. 73, pp. 186-194, doi: 10.1016/j.compositesa.2015.02.023.

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Title Rapidly cured out-of-autoclave laminates: understanding and controlling the effect of voids on laminate fracture toughness
Author(s) Agius, S. L.
Fox, B. L.
Journal name Composites part a: applied science and manufacturing
Volume number 73
Start page 186
End page 194
Total pages 9
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2015-06
ISSN 1359-835X
Keyword(s) Science & Technology
Technology
Engineering, Manufacturing
Materials Science, Composites
Engineering
Materials Science
Prepreg
Porosity
Fracture toughness
Optical microscopy
CARBON-FIBER COMPOSITES
INTERLAMINAR SHEAR-STRENGTH
MECHANICAL-PROPERTIES
CURING CYCLE
MOISTURE
TACK
Summary Voids are one of the most significant defects found within composites and have been demonstrated to reduce the performance of composite structures. The understanding of the impact of the size and distribution of voids on laminate properties is still limited because voids have proven difficult to deliberately control. This study aims to understand the mechanisms by which voids are generated within out-of-autoclave cured laminates. In this study, a process of prepreg conditioning was developed to control the level of voids within test laminates. Non-conditioned laminates highlighted signs of void growth (1.5%), while conditioned laminates showed consistently low levels of voids (<0.3%). Mass spectrometry indicated higher levels of aqueous and solvent volatiles within the non-conditioned prepreg. Finally, Mode II fracture testing revealed a 21% improvement in toughness for the non-voided laminates. A model on the effect of voids within the Mode II stress state has also been proposed.
Language eng
DOI 10.1016/j.compositesa.2015.02.023
Field of Research 091202 Composite and Hybrid Materials
0912 Materials Engineering
0913 Mechanical Engineering
0901 Aerospace Engineering
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30075411

Document type: Journal Article
Collections: School of Engineering
Institute for Frontier Materials
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