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.

Calabrese L., Fiore V., Bruzzaniti P., Scalici T., & Valenza A. (2020). Pinned hybrid glass-flax composite laminates aged in salt-fog environment: Mechanical durability. POLYMERS, 12(1), 40 [10.3390/polym12010040].

Pinned hybrid glass-flax composite laminates aged in salt-fog environment: Mechanical durability

Fiore V.
;
Valenza A.
2020

Abstract

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.
Settore ING-IND/22 - Scienza E Tecnologia Dei Materiali
https://res.mdpi.com/d_attachment/polymers/polymers-12-00040/article_deploy/polymers-12-00040.pdf
Calabrese L., Fiore V., Bruzzaniti P., Scalici T., & Valenza A. (2020). Pinned hybrid glass-flax composite laminates aged in salt-fog environment: Mechanical durability. POLYMERS, 12(1), 40 [10.3390/polym12010040].
File in questo prodotto:
File Dimensione Formato  
2020_Pinned hybrid glass-flax composite laminates aged in salt-fog environment_mechanical durability.pdf

accesso aperto

Tipologia: Versione Editoriale
Dimensione 7.05 MB
Formato Adobe PDF
7.05 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10447/395190
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 11
  • ???jsp.display-item.citation.isi??? 11
social impact