Transverse impact by RCCs on S-glass and Kevlar® FRC strips

Gao, Jinling; Guo, Zherui; Hernandez, Julio A.; Zhou, Fengfeng; Nie, Yizhou; Gao, Jian; Lim, Boon Him; Kedir, Nesredin; Zhai, Xiaoling; Wang, Junyu; Tsai, Jung-Ting; Carlo, Francesco De; Shevchenko, Pavel; Tallman, Tyler N.; Jun, Martin Byung‐Guk; Palmese, Giuseppe R.; Chen, Weinong

doi:10.1016/j.compositesa.2021.106425

Cited by 6 publications

(1 citation statement)

References 53 publications

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“…In particular, mechanical experiments on materials and structures above the fiber-scale level demonstrate that traditional rod-models cannot always capture fibers' failure characteristics. For example, transverse impact on yarns [1,2], composite strips [3], composite single plies [4], fabrics [5], and laminates [6] revealed a punch-shear failure mechanism at the critical velocity or ballistic limit, indicating that fibers are not under a pure-tension stress state. Besides, fractography on several fibers after transverse debonding with matrix [7] showed that aramid fibers were split transversely during debonding.…”

Section: Introductionmentioning

confidence: 99%

Transverse Loading on Single High-Performance Fibers by Round-Head Indenters and the Fibers’ Failure Visualization

Gao

Kedir

Lim

et al. 2022

Fibers

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High-performance fibers are well-known for their high stiffness and strength under axial tension. However, in their many applications as critical components of textiles and composites, transverse loads widely exist in their normal service life. In this study, we modified a micro material testing system to transverse load single fibers using round-head indenters. By integrating the loading platform with the Scanning Electron Microscopy (SEM) operating at a low-vacuum mode, we visualized the failure processes of fibers without conductive coatings. Post-fracture analysis was conducted to provide complementary information about the fibers’ failure. The energy dissipation was compared with the axial tensile experiments. Three inorganic and two organic fibers were investigated, namely carbon nanotube, ceramic, glass, aramid, and ultrahigh molecule weight polyethylene fibers. Different failure characteristics were reported. It is revealed that the organic fibers had higher energy dissipation than the inorganic fibers under the transverse loading by the round-head indenters. The fiber’s energy dissipation under transverse loading was no more than 17.9% of that subjected to axial tension. Such a reduced energy dissipation is believed to be due to the stress concentration under the indenter. It is suggested that the fiber’s material constituent, structural characteristics, and stress concentration under the indenter should be considered in the fiber model for textiles and composites.

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