期刊
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
卷 87, 期 5-8, 页码 2213-2220出版社
SPRINGER LONDON LTD
DOI: 10.1007/s00170-016-8613-5
关键词
Prepreg; Thermosetting resin; Cure behaviour; Mechanical testing
资金
- Tecnologie Avanzate s.r.l.
During the curing process, the exothermic cross-linking reaction inside epoxy resin-based composites causes overheating and, eventually, a thermal degradation of the matrix. Thick sectioned epoxy composites require an optimized curing cycle in order to minimize the temperature raise inside the composite. However, the recommended cycle for thin laminates is often wrongly used also for thick sectioned composites, resulting in an overheating. In this work, the mechanical behaviour of laminates having different thicknesses was investigated. Specimens were cured according to a curing cycle optimal for thin laminates which causes overheating in thicker laminates. The curing temperature histories at several positions inside the laminates were monitored and recorded and, following a new methodological approach, a series of comparative interlaminar shear tests was performed. Experimental results show a decrease of the interlaminar shear strength in thicker laminates. A simple model to account for the detrimental effect of the exothermic peak on the interlaminar shear strength is proposed.
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