Effect of interleaved composite nanofibrous mats on quasi-static and impact properties of composite plate
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ORIGINAL RESEARCH
Effect of interleaved composite nanofibrous mats on quasi‑static and impact properties of composite plate Hamidreza Zarei1 · Mohammad Nazari1 · Ali Ghaseminezhad Koushali2 Received: 12 March 2020 / Accepted: 18 July 2020 © Iran Polymer and Petrochemical Institute 2020
Abstract The necessity to produce modern composites with an acceptable impact resistance is an essential task in automobile and aerospace industry that needs to be satisfied. This capability is addressed by noteworthy energy absorption augmentation which is the most vital characteristic of such composite materials. In this paper, nanofibers are applied as interleaves to modify the delamination strength with a minimum rise in weight and thickness of the high-modulus polypropylene/epoxy composites. Nylon 6,6 nanofibers are produced by the electrospinning method. The distribution of nanofibers across the mats is examined by SEM. Innegra fabrics have been applied in composite layers production. The proper hand lay-up manufacturing of the laminates has been assured by the assistance of a hydraulic press. The energy absorption capacity at the onset of breakdown and impact resistance of the nanomodified and non-modified laminates were determined by quasistatic three-point flexural for the former and low-velocity impact tests for the latter. The obtained results were compared. The results showed a 6.2 and 16.9% increase in the energy absorption capacity of nanomodified laminates in quasi-static three-point flexural test and low-velocity impact tests, respectively. In addition, low-velocity impact tests revealed 16 and 26% improvement in maximum load capacity. Keywords Nanofiber · Electrospun · High-modulus polypropylene · Low-velocity impact · Energy absorption
Introduction In modern industries like aerospace, defense, transportation, automobiles, and structural applications composites are practiced to achieve enhanced performance and benefit improved energy absorption. All components specifically composite are imperiled by various loadings during their service life of which impact loads are significant among all. The impact phenomenon is classified into a high- and low-velocity regime based on subsequent damage, structure behavior, and energy transformation [1, 2]. A general deformation occurs in the low-velocity impact that is actually attributed to the total deformation of the object. Whereas, local deformation is the result of high-velocity impact as the sheet cannot deform during impact in short time [3–5]. * Hamidreza Zarei [email protected] 1
Center for Postgraduate Studies, Shahid Sattari University of Aeronautical Engineering, Tehran 13846‑73411, Iran
Faculty of Mechanical and Energy Engineering, Shahid Beheshti University, Tehran 1983969411, Iran
2
Composite structures are feebler against impact in comparison to metals. Impacting of an external object to laminate composite structures (like military bullet-proofs) results in internal microdamages that cannot be observed by the naked eye, e.g., matrix cracking, fibe
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