Fatigue behaviour and damage characterization of quasi-isotropic carbon/epoxy laminates. Issue 1 (31st December 2022)

• Record Type: Journal Article
• Authors: N H, Padmaraj; Pai K, Dayananda; Shreepannaga, Shreepannaga; Kini, M Vijaya
• Editors: Stojanovic, Blaza
• Is Part Of: Cogent engineering. Volume 9:Issue 1(2022)
• Publication Date: 2022-12-31
• Subjects: Carbon/Epoxy -- Fatigue Damage -- Stiffness degradation -- Energy dissipated -- Stress level; Engineering -- Periodicals; Technology -- Periodicals; Engineering; Technology; Periodicals; 620
• DOI: 10.1080/23311916.2022.2077680
• Languages: English
• ISSNs: 2331-1916

Abstract

Abstract: The present research work focuses on understanding the tension-tension fatigue durability of autoclave cured carbon/epoxy quasi-isotropic laminates. Based on the experimental results, S-N curve and stiffness degradation behaviour were developed. Damage growth mechanisms were studied based on the energy dissipated in each loading cycle at different stress levels. C-Scan and Scanning Electron Microscope were used to characterize the micro-crack growth and nature of fatigue failure. A bilinear trend was observed in the stress–strain curve with the failure of 90° oriented fibres in the initial phase followed by 0° oriented fibres. The energy dissipated and damage growth of the laminates at different stress levels followed a characteristic damage state curve. The C-Scan images showed the initiation of cracks on the specimen edges and propagating towards the center in the transverse direction.