Anti-impact response of Kevlar sandwich structure with silly putty core. (1st December 2017)

• Record Type: Journal Article
• Authors: Xu, Chenhui; Wang, Yu; Wu, Jie; Song, Shichao; Cao, Saisai; Xuan, Shouhu; Jiang, Wanquan; Gong, Xinglong
• Is Part Of: Composites science and technology. Volume 153(2017)
• Page Start: 168
• Page End: 177
• Publication Date: 2017-12-01
• Subjects: Flexible composites -- Sandwich -- Aramid fiber -- Polymer-matrix composites (PMCs) -- Impact behavior; Composite materials -- Periodicals; Composite materials; Fibrous composites; Periodicals; 620.118
• DOI: 10.1016/j.compscitech.2017.10.019
• Languages: English
• ISSNs: 0266-3538

Abstract

Abstract: A soft sandwich structure consisting of two layer Kevlar face sheets and a silly putty (SP) core was fabricated. The storage modulus of SP, which was prepared by dispersing CaCO3 particles into polyborodimethylsiloxane, increased by two to three orders of magnitude with increasing of the shear frequency. The higher CaCO3 content resulted in better shear-hardening behavior, which further enhanced the anti-impact performance of the sandwich structure. When the impact velocity was below 110 m/s, all energy was dissipated by the sandwich structure and the maximum energy dissipation was 20.8 J, represented a 60% increment than the neat Kevlar. Importantly, under the same impact energy, the energy dissipation of the sandwich structure under ballistic impact was 63% higher than under low velocity impact, which must be due to the shear-hardening nature. The mechanism of the excellent protection performance was discussed. The sensitivity to loading rate and reliable energy dissipation of the soft sandwich structure widely broad its practical applications.