Rapidly cured epoxy/anhydride composites: effect of residual stress on laminate shear strength

Agius, S.L., Joosten, M., Trippit, B., Wang, C.H. and Hilditch, T. 2016, Rapidly cured epoxy/anhydride composites: effect of residual stress on laminate shear strength, Composites part A: applied science and manufacturing, vol. 90, pp. 125-136, doi: 10.1016/j.compositesa.2016.06.013.

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Title Rapidly cured epoxy/anhydride composites: effect of residual stress on laminate shear strength
Author(s) Agius, S.L.
Joosten, M.ORCID iD for Joosten, M. orcid.org/0000-0002-4602-3246
Trippit, B.
Wang, C.H.
Hilditch, T.ORCID iD for Hilditch, T. orcid.org/0000-0003-0300-5774
Journal name Composites part A: applied science and manufacturing
Volume number 90
Start page 125
End page 136
Total pages 12
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2016-11
ISSN 1359-835X
1878-5840
Keyword(s) polymer matrix composites (PMCs)
residual/internal stress
mechanical testing
resin transfer moulding
Summary The drive towards rapid cure thermosetting composites requires a better understanding of the residual stresses that develop during curing. This study investigates the impact of residual stresses on the interlaminar shear strength of resin-infused epoxy/anhydride carbon-fibre laminates. The magnitude of the residual stress was varied by changing the initial injection cure temperature between 75 °C and 145 °C. The corresponding cycle times and the final glass transition temperature of the resin were also measured. The experimentally measured chemical shrinkage and thermal expansion properties of the resin after vitrification were used as inputs to a finite element analysis to calculate the peak residual stresses in the composite. An increase in the initial cure temperature from 85 to 135 °C resulted in an increase of 25% in the residual stress, which led to an experimentally measured reduction in the composite's short beam shear strength of approximately 16% (8 MPa), in good agreement with model prediction.
Language eng
DOI 10.1016/j.compositesa.2016.06.013
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 ©2016, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30085174

Document type: Journal Article
Collections: Institute for Frontier Materials
GTP Research
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