Hygrothermal effects on the fracture of coated and uncoated polymer-composites

Rao, RMVGK and Balasubramanian, N (1984) Hygrothermal effects on the fracture of coated and uncoated polymer-composites. Advances in Fracture Research, 4. pp. 2989-2996.

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Izod impact failure modes of glass and carbon composites were investigated with and without surface coatings after immersion in water at 298 degree K and 333 degree K for 1500 Hrs. Glass-Polyesters exhibited variations in fracture intensity, with characteristic shaving brush failure modes. The glass-epoxy composites while not exhibiting any total failure, showed local delamination below and around the notch-root region. Carbon-epoxy specimens showed typical brittle fracture indicating clear transverse fibre breakage, leading to specimen separation into two halves. Fibre pull out noted in exposed and uncoated specimens after impact, appears to be a favoured failure mode in these composites. The Izod impact strength of coated glass-polyesters degraded in the order Araldite PZ-985 E coated, Epoxy-Polyamide coated (EPPA) and Polyurethane coated (PU) for immersion at 298 degree K, while the order changed to PU-coated, PZ-985 E coated and EPPA-coated for immersion at 333 degree K.

Item Type: Article
Uncontrolled Keywords: Coatings;Epoxy resins;Polyesters;Glass epoxy composites;Glass-polyesters;Hygrothermal effects;Izod impact strength;Polymer-composites;Composite materials
Subjects: CHEMISTRY AND MATERIALS > Composite Materials
Depositing User: Ms. Alphones Mary
Date Deposited: 27 Jan 2006
Last Modified: 24 May 2010 04:08
URI: http://nal-ir.nal.res.in/id/eprint/490

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