Low Velocity Impact Behaviour of Aramid and UHMWPE Composites

Karahan, Mehmet; Yıldırım, Kenan

doi:10.5604/12303666.1152522

Cited by 16 publications

(9 citation statements)

References 22 publications

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“…The hybrid composites showed higher void content compared to non-hybrid composites attributed due to the difference in resin wettability of selected fabrics and compatibility of fabrics. However, the fiber volume content in the laminates is about 65-73%, which is well within the range generally observed in the literature for similar FRP composites [24][25][26][27]. Also, the void content is below 5.6 Vol.% for all fabricated samples as shown in Table 1.…”

Section: Fiber and Voids Contentsupporting

confidence: 87%

“…Also, considering two-fabric and three-fabric hybrid configurations, the two-fabric composites K/C/K and K/G/K exhibited better E ab compared to all other specimens consisting of all three-fabric reinforcements such as K/C/G, C/G/K, and G/C/K. Karahan et al [26] reported similar behavior for hybrid composites that having Kevlar fabric in the front and back layers leads to improved E ab and load-carrying capacity when subjected to impact loads. Ansari et al [17] also observed that the impact resistance behavior of Kevlar and glass fabric hybrid composites is highest when the glass layer is sandwiched in between plies of Kevlar fabric.…”

Section: High-velocity Impactmentioning

confidence: 95%

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High-velocity impact behavior of hybrid fiber-reinforced epoxy composites

Stephen

Shivamurthy

Mourad

et al. 2021

J Braz. Soc. Mech. Sci. Eng.

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In this study, non-hybrid and hybrid (Kevlar, carbon and glass) fabric epoxy composite laminates were fabricated with different stacking sequences by hand lay-up followed by hot-compression molding. Experimental tests were conducted to investigate tensile, flexural, and hardness characteristics. It was found that the stacking sequence did not significantly affect the tensile strength and hardness values of the composites; however, it affected their flexural strength. Damage morphology of the specimens through SEM images showed that the major damage mechanisms in the composites were delamination, fiber breakage, pull-out, and matrix cracking. Based on the static experimental results, the high-velocity impact behavior was investigated through simulation study using LS-DYNA finite element analysis (FEA) software. To study the ballistic impact, a steel projectile with a hemispherical penetrating edge at impact velocities of 100 m.s−1, 250 m.s−1, and 350 m.s−1 was considered. Among non-hybrid fabric epoxy composite specimens, Kevlar/epoxy specimen was found to have the highest impact energy absorption followed by carbon/epoxy and glass/epoxy, respectively. Regarding the hybrid fabric epoxy composite specimens, the ones with Kevlar plies in the rear face exhibited better energy absorption compared to other stacking sequences. The non-hybrid glass/epoxy specimen had the lowest energy absorption and highest post-impact residual velocity of projectile among all specimens. From the FEA results, it was noted that impact resistance of hybrid composites improved when Kevlar fabric was placed in the rear layer. Thus, the stacking sequence was observed to be of substantial importance in the development of fabric-reinforced composite laminates for high-velocity impact applications.

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Section: Fiber and Voids Contentsupporting

confidence: 87%

Section: High-velocity Impactmentioning

confidence: 95%

High-velocity impact behavior of hybrid fiber-reinforced epoxy composites

Stephen

Shivamurthy

Mourad

et al. 2021

J Braz. Soc. Mech. Sci. Eng.

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“…This is because the fibers in the UD structure are arranged in a linear and unfolded pattern, which causes the structure to absorb more energy. [32][33][34][35] These plates have a substantial degree of delamination between the layers. Hence their ballistic resistance is only 2.…”

Section: Level III Plate Testsmentioning

confidence: 99%

“…29–31 Extensive research has been done on the impact of manufacturing parameters, particularly for UHMWPE plates, on the ballistic resistance of composite structures. 32,33…”

Section: Introductionmentioning

confidence: 99%

The effect of manufacturing parameters on various composite plates under ballistic impact

Arı

Karahan

Kopar

et al. 2022

Polymers and Polymer Composites

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In this study, the usability of several composite plates in level III and level IV body armors were examined, along with the ballistic resistance, protection level, and production parameters of each plate. For level III protection, composite panels are made using the heat pressing method under various pressures, and for level IV composites, ceramic plates of various thicknesses are reinforced on the back with various composite materials. Ballistic tests using the NIJ standards were performed on the created composite panels. There were delaminations between the layers as a result of the ballistic test in the level III protective panels produced at 140 bar pressure, but there was no puncture in the panels produced at 250 bar pressure, and the depth of trauma was reduced to a minimum. These observations were made using samples produced at 90 bar pressure under controlled conditions. Level IV panels were subjected to dry and wet ballistic tests, and the results of these tests showed that K-flex reinforced ceramics were impervious to punctures. It has been found that aramid-reinforced epoxy ceramic panels and UD H62 reinforced ceramics have superior ballistic qualities and are 6% lighter.

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“…Defects can be located on the outermost face, that is, on the surface, or within the composite structure. Surface defects can be present such as cracks, porosities, and geometric deformations, and are often detected by visual inspection, while internal defects in the structure require more sophisticated equipment, for example, ultrasound or computed tomography scans (Jones 1975;Karahan and Yildirim 2015).…”

Section: Introductionmentioning

confidence: 99%

Influence of 2D and 3D Arrangements of Aramid Fibers on the Dart Drop Test of Epoxy Composites

Marlet,

Silva,

Rezende

2023

J. Aerosp. Technol. Manag.

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The use of continuous fibers reinforced polymeric composites has increased substantially in the last year's due to their high specific mechanical strength compared to other materials. Despite this property, this class of material is susceptible to low, medium, or high energy impacts, which can cause severe damage to composite laminates. One of the most serious damages is delamination, which can lead to partial or total rupture of the structure. In order to minimize this problem, several studies have been carried out in this area. In this context, this work aims to evaluate the influence of aramid reinforcement with bi-directional (2D) and tri-directional (3D) arrangements impregnated with two epoxy resins of different stiffness on the impact strength of composites submitted to the 340 J dart drop test. The impact results showed that the 2D composites had lower impact strength than the 3D ones, with the presence of perforations (when impregnated with the more rigid resin) and delaminations. Delaminations occurred regardless of the epoxy resin used in the impregnation. On the other hand, the 3D composites impregnated with the less rigid epoxy matrix absorbed more energy (3DF: 97.9%) with less deformation and no delamination compared to the 2D laminate (2DF: 96.1%) produced.

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Low Velocity Impact Behaviour of Aramid and UHMWPE Composites

Cited by 16 publications

References 22 publications

High-velocity impact behavior of hybrid fiber-reinforced epoxy composites

High-velocity impact behavior of hybrid fiber-reinforced epoxy composites

The effect of manufacturing parameters on various composite plates under ballistic impact

Influence of 2D and 3D Arrangements of Aramid Fibers on the Dart Drop Test of Epoxy Composites

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