Autor(es): Santos, P ; Silva, Abílio P ; Reis, P. N. B.
Data: 2023
Identificador Persistente: https://hdl.handle.net/10316/116873
Origem: Estudo Geral - Universidade de Coimbra
Projeto/bolsa: info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB/PT; info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB/PT;
Assunto(s): Carbon fibre reinforced polymer laminates; carbon nanofibers; epoxy resin; viscoelastic behaviour; stress relaxation; creep
Carbon fibre reinforced polymer (CFRP) laminates nano-enhanced with carbon nanofibers (CNFs): 0.75 wt% and 0.5 wt% of epoxies Sicomin and Ebalta, respectively, were manufactured and their static and viscoelastic behaviour analyzed. After 180 min, the bending stress decreases and creep displacement increases over time, with Ebalta nano-enhanced resin laminates with CNFs showing the best results. A strong dependence of creep behaviour and stress relaxation is obtained with the applied stress level. The results show that laminates produced with pure Sicomin resin increased creep displacement by 1%, for a bending stress of 200 MPa, and 2 times greater for the bending stress of 700 MPa. The viscoelastic behaviour of CFRP composites nano-enhanced with CNFs was accurately predicted by the Kohlrausch-Williams-Watts (KWW) model and Findley power law.
FCT- Fundação para a Ciência e a Tecnologia, I.P./MCTES, through national funds (PIDDAC), within the scope of the Unit I&D C-MAST (Centre for Mechanical and Aerospace Science and Technology), Project UIDB/00151/2020. FCT-Fundação para a Ciência e a Tecnologia, under the projects UIDB/00285/2020 and LA/P/0112/2020.
