Environmental effects on composite structures

Gopalan, R and Chandra, Ramesh (1989) Environmental effects on composite structures. Journal of Aeronautical Society of India, 41 (1). pp. 55-59.

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    Abstract

    Environmental effects on the degradation of the strength and stiffness of both GFRP test coupons and an actual composite structure (Radome) of a wing mounted store of a military aircraft were experimentally determined. The experimental investigation revealed that the GFRP composite absorbs 1.2 percent moisture when exposed to water at 343 K for 20 days. The degradation on the ultimate tensile strength and Young's modulus was 19 percent and 14.7 percent, respectively. A GFRP radome fabricated at NAL was subjected to various environmental tests as per MIL and JSS specification. Static tests were carried out on the radome before and after exposure to various environmental tests. The radome withstood the design load without failure but with an increase in the tip deflection of 20 percent and 45 percent at limit load and at ultimate load, respectively.

    Item Type: Journal Article
    Uncontrolled Keywords: Radomes;Glass fiber reinforced plastics;Exposure; Degradation;Aeronautics;Static tests;Stiffness;Ultimate tensile strength;Deflection;Military aircraft;Fabrication; Failure;Specifications;Absorbance;Water;Wings (aircraft); Composite structures;Enviornmental tests;Glass fiber reinforced plastics
    Subjects: AERONAUTICS > Aircraft Design, Testing & Performance
    Division/Department: Advanced Composites Division, Structures Division
    Depositing User: shankar sk nadoor
    Date Deposited: 06 Nov 2006
    Last Modified: 24 May 2010 09:52
    URI: http://nal-ir.nal.res.in/id/eprint/3264

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