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Hygrothermal durability and failure modes of FRP for marine applications

Santhosh, K and Muniraju, M and Shivakumar, ND and Raguraman, M (2012) Hygrothermal durability and failure modes of FRP for marine applications. In: JOURNAL OF COMPOSITE MATERIALS, 46 (15). pp. 1889-1896.

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Official URL: http://dx.doi.org/10.1177/0021998311427776


This article deals with the durability of 2D woven mat carbon/polyester, glass/isopolyester, and gel-coated glass/isopolyester reinforced composites under hygrothermic conditions with regard to marine applications. The test coupons were exposed to 60 degrees C and 70 degrees C at 95% RH for a maximum duration of 100 h. The samples were periodically withdrawn and weighed for moisture absorption and tested for the degradation in the mechanical properties such as ultimate tensile strength, flexural strength, interlaminar shear strength, and Young's modulus and flexural modulus. Carbon/isopolyester-based specimens showed greater stability with respect to degradation in the mechanical properties than the glass/isopolyester/gel coat- and glass/isopolyester-based specimens. Glass/isopolyester exhibited the maximum moisture absorption, whereas the minimum moisture absorption was found in glass/isopolyester/gel coat. Diffusion coefficient (D) was found to be the highest for glass/isopolyester and the lowest for glass/isopolyester/gel coat, based on the Fick's law of diffusion. Diffusion coefficient increases with the increase in temperature for all the specimens. Microstructure study of fractured specimens was carried out using scanning electron microscope to compare matrix/fiber debonding and matrix-degradation of fiber-reinforced polymer composites.

Item Type: Journal Article
Keywords: Hygrothermal aging;polymer matrix composites;moisture absorption;mechanical properties;isopolyester;diffusion coefficient;SEM
Department/Centre: Division of Mechanical Sciences > Centre for Product Design & Manufacturing
Date Deposited: 24 Aug 2012 05:06
Last Modified: 24 Aug 2012 05:06
URI: http://eprints.iisc.ac.in/id/eprint/44965

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