Compressive failure mechanisms in unidirectional fiber reinforced polymer composites with embedded wrinkles

Krishnappa, S and Gururaja, S (2024) Compressive failure mechanisms in unidirectional fiber reinforced polymer composites with embedded wrinkles. In: Composites Part B: Engineering, 284 .

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Abstract

The present study examines how wrinkles affect a composite material's compressive failure behavior. Uni-directional carbon fiber-reinforced polymer (UD-CFRP) composites with artificially induced wrinkles were fabricated by placing laminate strips in specific positions. The geometry and placement of these strips were varied, resulting in 18 different wrinkle configurations. Through extensive experimental testing, it was observed that the compressive strength decreased significantly, ranging from 20 to 73, depending on the specific wrinkle configuration. The experimental results were found to align well with existing analytical models. Additionally, the study examined how the wrinkle characteristics affected the final kink bandwidth, angle, and inclination. Fractographic studies on the failed specimens revealed various damage modes at different length scales, including kinking, delamination, buckle delamination, crushing, fiber pullout, matrix cracking/failure, and fiber failure. Based on these findings, it is emphasized that the geometry of the wrinkles and the aforementioned damage modes at different length scales must be accounted for while developing a numerical model to predict the compressive behavior of the composite accurately. © 2024 Elsevier Ltd

Item Type:	Journal Article
Publication:	Composites Part B: Engineering
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to Elsevier Ltd.
Keywords:	Carbon fiber reinforced plastics; Crushing; Failure (mechanical); Fibers; Laminated composites, Buckle delamination; Compressive failure; Crushing; Damage modes; Fiber failures; Fiber pull out; Kinking; Matrix cracking; Matrix cracking/failure; Wrinkle, Compressive strength
Department/Centre:	Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited:	17 Dec 2024 10:00
Last Modified:	17 Dec 2024 10:00
URI:	http://eprints.iisc.ac.in/id/eprint/85806

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