Experimental study into compression after impact strength of laminates with conventional and nonconventional ply orientations. (1st October 2017)

• Record Type: Journal Article
• Authors: Liv, Yi; Guillamet, G.; Costa, J.; González, E.V.; Marín, L.; Mayugo, J.A.
• Is Part Of: Composites. Number 126(2017)
• Page Start: 133
• Page End: 142
• Publication Date: 2017-10-01
• Subjects: Nonconventional laminate -- Delamination -- Impact behaviour -- Damage tolerance; Composite materials -- Periodicals; Materials science -- Periodicals; Composite materials; Periodicals; Electronic journals; 620.118
• DOI: 10.1016/j.compositesb.2017.05.074
• Languages: English
• ISSNs: 1359-8368

Abstract

Abstract: The quest for impact damage tolerant laminates by tailoring stacking sequences has led to nonconventional laminates whose ply sequences are not limited to 0, ±45 and 90°. Departing from the hypothesis that compression after impact (CAI) strength is impaired by the presence of delaminations, a ply sequence was defined by selecting the mismatch angles between plies so as to maintain a central sublaminate with no, or small, delaminations. An experimental test campaign was devoted to validate this hypothesis. To that purpose, baseline and blocked-ply laminates were included in the study. Specimens were tested under low velocity impact followed by compression according to ASTM standards. Delaminations were identified with Ultrasonic C-Scan. The results show delamination locations being successfully predetermined by controlling the mismatch angle, as well as the ensuing improvement in compressive strength retention after impact.