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Open AccessArticle

Pinned Hybrid Glass-Flax Composite Laminates Aged in Salt-Fog Environment: Mechanical Durability

1
Department of Engineering, University of Messina, Contrada Di Dio (Sant’Agata), 98166 Messina, Italy
2
Department of Engineering, University of Palermo, Viale delle Scienze, Edificio 6, 90128 Palermo, Italy
3
School of Mechanical and Aerospace Engineering, Queen’s University Belfast, Ashby Building, Stranmillis Road, BT9 5AH Belfast
*
Author to whom correspondence should be addressed.
Polymers 2020, 12(1), 40; https://doi.org/10.3390/polym12010040
Received: 12 December 2019 / Revised: 21 December 2019 / Accepted: 22 December 2019 / Published: 26 December 2019
(This article belongs to the Special Issue Reinforced Polymer Composites)
The aim of the present paper is to study the mechanical performance evolution of pinned hybrid glass-flax composite laminates under environment aging conditions. Hybrid glass-flax fibers/epoxy pinned laminates were exposed to salt-spray fog environmental conditions up to 60 days. With the purpose of assessing the relationship between mechanical performances and failure mechanisms at increasing aging time, single lap joints at varying joint geometry (i.e., hole diameter D and hole distance E from free edge) were characterized after 0 days (i.e., unaged samples), 30 days, and 60 days of salt-fog exposition. Based on this approach, the property–structure relationship of the composite laminates was assessed on these critical environmental conditions. In particular, a reduction of failure strength for long-aging-time-aged samples was observed in the range 20–30% compared to unaged one. Due to the natural fiber degradation in a salt-fog environment, premature catastrophic fractures mode due to shear-out and net-tension were found, related to reduced joint fracture strength. This behavior identifies that this type of joint requires a careful design in order to guarantee an effective mechanical stability of the composite hybrid joint under long-term operating conditions in an aggressive environment. View Full-Text
Keywords: bearing; salt fog aging; glass-flax hybrid coposites; pinned joints; failure modes bearing; salt fog aging; glass-flax hybrid coposites; pinned joints; failure modes
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MDPI and ACS Style

Calabrese, L.; Fiore, V.; Bruzzaniti, P.; Scalici, T.; Valenza, A. Pinned Hybrid Glass-Flax Composite Laminates Aged in Salt-Fog Environment: Mechanical Durability. Polymers 2020, 12, 40.

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