"Examining the impact of moisture on the mechanical and vibrational cha" by Fardeen Shaikh, Neha Monis et al.
 

Examining the impact of moisture on the mechanical and vibrational characteristics of quasi isotropic kevlar-basalt/epoxy hybrid composites

Document Type

Article

Publication Title

Cogent Engineering

Abstract

This research explores the effects of moisture absorption on the mechanical and vibrational performance of Kevlar-basalt/epoxy laminates, which are significant for their strength-to-weight ratio yet susceptible to hygrothermal aging. The quasi-isotropic orientation of [0°/45°/90°/45°/0°] was selected with three Kevlar (0° and 90° orientation) and two basalt (45° orientation) layers. The fabricated laminates were subjected to ageing environments viz., ambient temperature ageing (ATA) and cold temperature ageing (CTA) by immersing in water for a period of six months. The specimens saturated with moisture were analyzed for mechanical and vibrational tests such as tensile, 3-point bending, Charpy impact and impact hammer tests to understand the post ageing behavior of the laminates. ATA and CTA specimens absorbed 4.52% and 3.21% moisture, respectively at saturation. ATA specimens experienced the largest tensile strength reduction of 28.64%, while CTA specimens declined by 14.84%. Flexural strengths decreased by 17.52% for ATA and 7.66% for CTA. CTA specimens retained the highest impact strength at 80.39%, followed by ATA at 75.44%. Increased moisture content led to a higher damping ratio and lower natural frequency, with ATA specimens showing more matrix deterioration, fiber-matrix interface weakening, and delamination than CTA specimens.

DOI

10.1080/23311916.2024.2417686

Publication Date

1-1-2024

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