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Structural Damage Characteristics of a Layer-to-Layer 3-D Angle-Interlock Woven Composite Subjected to Drop-Weight Impact

Qian Ma, Ke Wang, Shudong Wang, Yiwei Ouyang, Zhiqiang Lin, Wenfeng Shi, Limin Jin, Xianyan Wu

Autex Research Journal

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2021

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Vol. 21, no. 3

293--298

EN

The most attractive structural feature of the three-dimensional (3D) angle-interlock woven structure is that the straight weft yarns are bundled by the undulated warp yarns, which induces the overall good structural stability and a stable fabric structure. Thus the 3-D angle-interlock woven composite (3DAWC) prepared by the vacuum-assisted resin transfer molding (VARTM) curing process has excellent mechanical properties by using the fabric and epoxy resin as the reinforcement and matrix, respectively. The low-velocity impact damage properties of the composites under different drop-weight energies (70, 80, and 100 J) were tested experimentally. The load–displacement curves, energy–time curves, and the ultimate failure modes were obtained to analyze the performance of resistance to low-velocity impact, as well as the impact energy absorption effect and failure mechanism, especially the structural damage characteristics of the 3DAWC subjected to the low-velocity impact of drop weight. By analyzing the obtained experimental results, it is found that the fabric reinforcement is the primary energy absorption component and the impact energy mainly propagates along the longitudinal direction of the yarns, especially the weft yarn system, which is arranged in a straight way. In addition, as the impact energy increases, the energy absorbed and dissipated by the composite increases simultaneously. This phenomenon is manifested in the severity of deformation and damage of the material, i.e., the amount of deformation and size of the damaged area.

2

Development Of Multistitched Three-Dimensional (3D) Nanocomposite And Evaluation Of Its Mechanical And Impact Properties

Bilisik K., Ozdemir H., Kaya G.

Autex Research Journal

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2017

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Vol. 17, no. 3

238--249

EN

Multistitched three-dimensional (3D) woven E-glass/polyester/nanosilica composite (MNS) was developed. Its mechanical and impact performances were characterized for particular end-use applications. It was found that the warp-weft directional tensile strength and modulus of MNS structure were higher than those of the off-axis directions. In addition, there was not a big difference between warp and weft directional bending and short beam strengths of MNS structure. The MNS structure had a small damaged area under low velocity impact load. The failure was confined at a narrow area because of multistitching and nanomaterial and resulted in the catastrophic fiber breakages in the normal direction of the applied load of the structure. The results from the study indicated that the multistitching and the addition of nanosilica in the composite structure improved its damage tolerance.

3

Stiffness behavior of hybrid laminated composites with surface crack

Güneş A., Şahin Ö. A.

Archives of Materials Science and Engineering

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2016

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Vol. 80, nr 2

49--52

EN

Purpose: The purpose of this paper investigates to stiffness behavior of hybrid laminated composites with surface crack. Design/methodology/approach: Hybrid laminated composites has 18 layers and 90x25 mm size with two different layers line up. The low velocity impact test of hybrid laminated composites carried on 3 m/sec with a/t=0.4 and a/c=0.4 surface crack parameters. Findings: The results are presented as the change of force-time and force-displacement graphs. As a result of this study, effects of stacking sequence on hybrid composite plates were analysed. Research limitations/implications: The research of stiffness behavior or dynamic response of hybrid laminated composites can contribute to developing new composite materials. Practical implications: These hybrid laminated composites materials could be used for different aviation areas. Originality/value: This paper is based on studies from Selçuk University and all the experiments and results were conducted by me.

4

Effect of surface crack depth on hybrid laminated composites

Güneş A., Şahin Ö. S.

Archives of Materials Science and Engineering

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2016

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Vol. 82, nr 1

38--41

EN

Purpose: The purpose of this paper researches to effect of different surface crack depth on hibrid laminated composites under low velocity impact forces. Design/methodology/approach: Hybrid laminated composites have 90x25 mm size and 18 layers with two different stacking sequence. Low velocity impact test of hybrid laminated composites with surface crack have been investigated with different a/t surface crack parameters and 3 m/sec velocity. Findings: The results are presented force-time and energy-time graphs than effects of different crack parameters were observed. As a result of this study, effects of surface crack depth on hybrid composite plates were analysed. Research limitations/implications: The research of dynamic behavior of hybrid laminated composites with surface crack can contribute to literature searches. Practical implications: These hybrid laminated composites materials could be used for different aviation areas. Originality/value: This paper is based on studies from Selçuk University and all the experiments and results were conducted by me.

5

Low Velocity Impact Behaviour of Aramid and UHMWPE Composites

Karahan M., Yildirim K.

Fibres & Textiles in Eastern Europe

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2015

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Vol. 23, no. 3 (111)

97--105

EN

The most popular method to produce composites for ballistic applications is to use aramid and ultra high molecular weight polyethylene (UHMWPE) fibers as reinforcement materials in different matrices. The composite materials used in this type of application, especially those used as armoring materials for explosions, are subjected to a very high level of energy. In this study, the effect of the reinforcement material type and cross-plied condition of reinforcement were examined using high-level impact tests. The impact tests were performed at low speed but high energy, and thus the behaviour of the composite materials that were exposed to high-level impact energy could be examined. According to the results, the UD aramid composite produced the best results with respect to high-level impact tests. In addition, mass optimisation could be achieved without the loss of the high-level impact energy by preparing a hybrid composite with UD UHMWPE and UD aramid fibers.

PL

Powszechną metodą produkcji kompozytów dla zastosowań balistycznych jest użycie jako wzmocnienia włókien aramidowych oraz włókien polietylenowych o super wysokim ciężarze cząsteczkowym i różnych materiałach matrycy. Materiały kompozytowe stosowane w tego typu rozwiązaniach, specjalnie te stosowane jako materiał wzmacniający w przypadku eksplozji są poddawane testom o bardzo wysokim poziomie energii. W przedstawionej pracy badano efekty zastosowania różnego typu materiałów wzmacniających i ich konfiguracji w strukturze. Badania prowadzono stosując testy udarowe o bardzo wysokiej energii lecz małej prędkości udaru. Dzięki temu można było sprawdzić zachowanie różnych zastosowanych materiałów. W efekcie stwierdzono, że najlepsze wyniki uzyskuje się używając włókna aramidowe. Dodatkowo można było przeprowadzić optymalizacje masy poprzez przygotowanie kompozytów hybrydowych.