Fatigue behaviour of un-notched and open-hole quasi-isotropic pseudo-ductile thin-ply carbon/glass hybrid laminates

Fotouhi, Mohammad; Suwarta, Putu; Jenkin, Ross; Jalalvand, Meisam; Wisnom, Micheal

Abstract

This paper investigates fatigue behaviour of a QI composite made from thin carbon plies and standard thickness glass plies. As illustrated in Fig. 2, this orientation-dispersed QI thin-ply carbon/glass hybrid laminate showed a successful pseudo-ductile un-notched behaviour with improved notch-insensitivity and suppression of free-edge delamination. In this study an experimental program has been carried out to investigate the damage development throughout the life of un-notched and open-hole thin-ply carbon/glass hybrid configurations consisting of thin ply T300 carbon/epoxy and S-glass/epoxy prepregs, before having any pseudo-ductile damage and at two different stress levels. The fatigued samples are illustrated in Figs. 3 and 4. The knee point is determined at the intersection of the lines fitted through the initial linear and the plateau parts of the individual stress-strain curves. It was observed that, for the un-notched samples, there is no stiffness reduction, after 100,000 cycles, for a stress level of 80% of the knee-point stress at which significant damage starts. By increasing the stress level to 90% of the knee point stress, there is a gradual stiffness reduction due to the appearance of matrix cracking and delamination.

• Presentation Conference Type: Presentation / Talk
• Conference Name: ICCM22
• Start Date: Aug 11, 2019
• End Date: Aug 16, 2019
• Acceptance Date: Mar 13, 2019
• Deposit Date: Apr 18, 2019
• Publicly Available Date: Apr 18, 2019
• Peer Reviewed: Not Peer Reviewed
• Keywords: fatigue, un-notched, open-hole, quasi-isotropic, pseudo-ductile, thin-ply, carbon/glass hybrid
• Public URL: https://uwe-repository.worktribe.com/output/850596
• Additional Information: Title of Conference or Conference Proceedings : ICCM22
• Contract Date: Apr 18, 2019