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Rapidly cured epoxy/anhydride composites: effect of residual stress on laminate shear strength
journal contribution
posted on 2016-11-01, 00:00 authored by Steven Agius, Mathew JoostenMathew Joosten, B Trippit, C H Wang, Tim HilditchTim HilditchThe 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.
History
Journal
Composites part A: applied science and manufacturingVolume
90Pagination
125 - 136Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
1359-835XeISSN
1878-5840Language
engPublication classification
C Journal article; C1 Refereed article in a scholarly journalCopyright notice
2016, ElsevierUsage metrics
Categories
Keywords
polymer matrix composites (PMCs)residual\/internal stressmechanical testingresin transfer mouldingScience & TechnologyTechnologyEngineering, ManufacturingMaterials Science, CompositesEngineeringMaterials SciencePOLYMER-MATRIX COMPOSITESTRANSVERSE FAILUREEPOXYNANOPARTICLESRESINAerospace EngineeringMechanical Engineering
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