In-situ observation of cutting-induced failure processes of single high-performance fibers inside a SEM

Gao, Jinling; Nie, Yizhou; Lim, Boon Him; Zhai, Xiaoling; Kedir, Nesredin; Chen, Weinong

doi:10.1016/j.compositesa.2020.105767

Cited by 19 publications

(7 citation statements)

References 28 publications

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“…Although for the 20-micron indenter, a tensile failure of some fibrils is observed at one end of the failed fiber as shown in all its Figure 6a,c,e. Gao et al [26,27] and Hudspeth et al [13] have also reported similar failure images in their study on transverse failure of SK-76 fibers. However, the failure surfaces shown here for the 20-micron indenter (for failure angles 26 • (as shown later in Figure 9) are in contrast with those reported in [13] for SK-76 single fibers which fail mainly via fibrillation for failure angles up to 40 • and shear failure for failure angles at 50 • .…”

Section: Transverse Loading-the Effect Of Angle and Indenter Geometrysupporting

confidence: 63%

Experimental Investigation of Transverse Loading Behavior of Ultra-High Molecular Weight Polyethylene Yarns

Shah

Sockalingam

2020

Fibers

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Ultra-high molecular weight polyethylene (UHMWPE) Dyneema® SK-76 fibers are widely used in personnel protection systems. Transverse ballistic impact onto these fibers results in complex multiaxial deformation modes such as axial tension, axial compression, transverse compression, and transverse shear. Previous experimental studies on single fibers have shown a degradation of tensile failure strain due to the presence of such multi-axial deformation modes. In this work, we study the presence and effects of such multi-axial stress-states on Dyneema® SK-76 yarns via transverse loading experiments. Quasi-static transverse loading experiments are conducted on Dyneema® SK-76 single yarn at different starting angles (5°, 10°, 15°, and 25°) and via four different indenter geometries: round (radius of curvature (ROC) = 3.8 mm), 200-micron, 20-micron, and razor blade (ROC ~2 micron). Additionally, transverse loading experiments were also conducted for a 0.30 cal. fragment simulating projectile (FSP) and compared to other indenters. Experimental results show that for the round, 200-micron indenter, and FSP geometry the yarn fails in tension with no degradation in axial failure strain compared to the uniaxial tensile failure strain of SK-76 yarn (2.58%). Whereas for the 20-micron indenter and razor blade, fibers fail progressively in transverse shear followed by progressive strength degradation of the yarn. Strength degradation of yarn occurs at relatively low strains of 0.6–0.7% with eventual failure of the yarn at approximately ~1.8% and ~1.5% strain for the 20-micron indenter and razor blade, respectively. Breaking angles (range of 10°–30°) are observed to have little effect on the failure strain for all indenter geometries.

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Section: Transverse Loading-the Effect Of Angle and Indenter Geometrysupporting

confidence: 63%

Experimental Investigation of Transverse Loading Behavior of Ultra-High Molecular Weight Polyethylene Yarns

Shah

Sockalingam

2020

Fibers

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“…Smaller cutting angles are more likely to cause more localized complex stress state around the edge tip and decrease the cutting resistance of the fiber. 41 The impacted area in direct contact with the projectile front nose is divided into three sections, namely sections I, II, and III. It is observed that the fibers in section I and III only break along the projectile edges, leaving the rest of the fibers almost intact.…”

Section: Analysis Of Ballistic Impact Behavior and Ballistic Limits Of Real-size Multi-layer Fabricmentioning

confidence: 99%

A filament-level analysis on failure mechanism and ballistic limit of real-size multi-layer 2D woven fabrics under FSP impact

Dippolito

Miao

et al. 2021

Textile Research Journal

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This paper investigates the failure mechanism and fabric ballistic performance of real-size multi-layer 2D woven fabrics impacted by sharp-edge fragment simulating projectile (FSP). First, the relations between digital fiber shear force and bending rigidity are established under the modified digital element approach (DEA) framework. Then, a systematic parametric study was carried out on the ballistic impact of a 4-inch-long single yarn and 4-inch by 4-inch 2D woven fabric at near fiber level to solve for the relations of digital fiber moment of inertia and ballistic limit. The results show that for the same number of digital fibers per yarn model, the simulated ballistic limits are in direct proportion to digital fiber moment of inertia. The increase of the number of digital fibers per yarn, however, decreases the digital fiber moment of inertia effect on ballistic limits. Second, the 1- to 28-layer real-size 2D woven Kevlar KM2 fabrics are simulated at filament level against FSP on the cluster to estimate the V50 zone. The perforation process and failure mechanism of 4-layer fabric is investigated and analyzed in detail. The simulation results demonstrate the deformed fabric shape with respect to time and the damage modes at the impact area. Numerical results are compared with standard ballistic test results.

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“…Over the past decades, with an increasing demand for wearable personal protective equipment, researchers have focused their attention on the development of lightweight and soft CSRM [10,11]. The production of high-performance ber textiles, such as aramid [12,13], ultra-high molecular weight polyethylene [14,15] (UHMWPE), and basalt ber [16], with high-count and high-density, has been an effective tactic for preparing soft CSRM. And considerable efforts have been devoted to twodimensional (2D) CSRM [9,[17][18][19] and three-dimensional (3D) CSRM [16, [20][21][22][23][24] to achieve the aforementioned objective.…”

Section: Introductionmentioning

confidence: 99%

The Cut-/Stab-Resistance of Protective Composite Textiles Reinforced with Particle Additives

Mao

et al. 2023

Preprint

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This study prepared a soft-rigid unified structure (SRUS) textile composed of inorganic powder (IP) reinforced epoxy resin block (EIPB) array and a soft textile substrate via a pattern-controllable integrated molding method. The effects of IP content and alumina particle size on the cutting and puncture resistance of the resulting SRUS textile were evaluated. The anti-puncture and anti-cutting mechanisms of the SRUS textile were assessed based on the damage morphology and process. The experimental results demonstrated a significant enhancement in the puncture and cut resistance of the SRUS textile after the addition of IP. Moreover, the cut/stab resistance of the SRUS textile increased with the increase of IP content and the size of Al2O3, and the optimal cut/stab resistance was observed at 60 mesh-50 wt.%. The maximum stab and cut resistance of the SRUS textile increased by approximately 19.2% and 62.1%, respectively, reaching the highest protection level when compared to pure SRUS textile. Additionally, the hard passivation at the EIPB and the friction self-locking at the interval were considered to be the anti-puncture mechanism of the SRUS textile, while the anti-cutting mechanism was attributed to the reverse cutting of hard particles on the blade.

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In-situ observation of cutting-induced failure processes of single high-performance fibers inside a SEM

Cited by 19 publications

References 28 publications

Experimental Investigation of Transverse Loading Behavior of Ultra-High Molecular Weight Polyethylene Yarns

Experimental Investigation of Transverse Loading Behavior of Ultra-High Molecular Weight Polyethylene Yarns

A filament-level analysis on failure mechanism and ballistic limit of real-size multi-layer 2D woven fabrics under FSP impact

The Cut-/Stab-Resistance of Protective Composite Textiles Reinforced with Particle Additives

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