Effect of hygrothermal aging on the interlaminar shear strength of a carbon fibre composite

Shetty, K and Srihari, Shylaja and Manjunatha, CM (2019) Effect of hygrothermal aging on the interlaminar shear strength of a carbon fibre composite. In: 2nd International Conference on Structural Integrity and Exhibition 2018.

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Abstract

Carbon Fibre Reinforced Plastic (CFRP) composites are used many applications in aerospace structures due to their high specif ic strength and stiffness. Composite aircraft structures are usually exposed to a range of environmental conditions such as hygroth ermal, UVradiation, chemical environments, biological condition etc., in their service life and may degrade. Moisture absorption at different hygrotherma l conditions and its effects on properties of CFRP composites is a useful parameter to designers and application engineers. In this study, UD carbon fiber/epoxy composite laminates were fabricated (HexPly® M21E/34%/UD/194/IMA) from prepreg using standard autoclave process. Inter Laminar Shear Strength (ILSS) test specimens were cut and prepared from theses laminates. Hot-wet specimens were aged at two different conditions; 75 0C/ 85% RH, 55 0C/ 100% RH until attaining moisture absorption saturation. Three-point bend tests were conducted as per ASTM test standard specifications using a 25 KN servo-hydraulic test machine to determine ILSS properties for aged and unaged material. Respective hot -wet conditions were maintained even during the mechanical tests. Tests results show that moisture absorption rate increases gradually and attains saturation at about 1 wt. % under both conditions. Inter laminar shear strength reduced significantly by about 33% due to presence of moisture. Microscopic observation of failed samples also investigated to study the fracture behavior and reported in this paper.

Item Type:	Conference or Workshop Item (Paper)
Uncontrolled Keywords:	Composite; Hygrothermal; Inter Laminar
Subjects:	CHEMISTRY AND MATERIALS > Composite Materials CHEMISTRY AND MATERIALS > Nonmetallic Materials ENGINEERING > Structural Mechanics
Depositing User:	Smt Bhagya Rekha KA
Date Deposited:	07 Jun 2022 09:35
Last Modified:	07 Jun 2022 09:35
URI:	http://nal-ir.nal.res.in/id/eprint/13592

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