Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
EXPERIMENTAL CHARACTERIZATION OF MODE I INTERLAMINAR FRACTURE TOUGHNESS IN LOW-MELT PAEK THERMOPLASTIC COMPOSITE MATERIAL
Submission Author:
Natália Marinho , SP , Brazil
Co-Authors:
Natália Marinho, Mariano Arbelo, Francis Gonzalez, Geraldo Cândido, Rita Sales, Mauricio Donadon
Presenter: Natália Marinho
doi://10.26678/ABCM.COBEM2019.COB2019-0551
Abstract
Mode I fracture is one of the most widely studied fracture modes in fiber-reinforced polymer structural composites research. On the other hand, fracture properties of thermoplastic structural composites have not been studied extensively. This paper presents the determination of opening Mode I strain energy release rate (GI) for a reinforced thermoplastic laminate made by a semipreg plain-5H satin weave fabric and a semi-crystalline engineered polyarlyetherketone (PAEK) resin. Interlaminar fracture toughness was calculated based on Modified Beam Theory (MBT) method considering a perfectly built-in double cantilever beam. Experimental procedure and calculations to characterize Mode I interlaminar fracture toughness was performed according to Double Cantilever Beam (DCB) test method described in ASTM D5528-13 using end blocks to introduce opening forces. Comparisons with analytical solution using simple beam theory analysis was carried out to verify the obtained results. Finally, a fractography analysis was carried out in the tested samples to determine the failure mechanisms involved during the fracture process. Results demonstrated that thermoplastic composites usually present enhanced fracture toughness compared to thermosets. This improved fracture behavior is justified mainly due to the higher fracture resistance of crystalline polymers in comparison to amorphous polymers.
Keywords
Carbon fibre composites, delamination, Fracture mechanic, Thermoplastics, Mode I delamination
