Delamination strength of composite curved beams reinforced by grooved stainless-steel Z-pins. (15th November 2017)

• Record Type: Journal Article
• Authors: Ju, Hyunwoo; Nguyen, Khanh-Hung; Chae, Song-Su; Kweon, Jin-Hwe
• Is Part Of: Composite structures. Volume 180(2017)
• Page Start: 497
• Page End: 506
• Publication Date: 2017-11-15
• Subjects: Z-pinning -- Delamination -- Composite curved beam -- 4-Point bending; Composite construction -- Periodicals; Composites -- Périodiques; 624.18
• DOI: 10.1016/j.compstruct.2017.08.018
• Languages: English
• ISSNs: 0263-8223

Abstract

Abstract: When a laminated composite structure with curvature is subjected to a bending load, the most important failure mode is due to delamination in curved regions. In this study, the reinforcement effect of grooved Z-pins is investigated for preventing delamination of curved beams. Through a four-point bending test, the effect of stainless-steel pin diameter and areal density on bending failure of curved beams is studied. For areal pin densities of 0.5, 1.0, and 2.0%, pin diameters of 0.3 and 0.5 mm result in average pin strength increases of 21, 27, and 42% and 8.7, 12, and 32%, respectively. When the pin size is small, the pin is inserted closer to 90° from the mid-plane, a smaller resin-rich zone is generated, and there is less laminate damage.