Investigating on the energy absorption of PA/GF6 thermoplastic composite produced by hot pressing method under low-velocity impact test

Authors

1 MSc, Mech. Eng., Tarbiat Modares Univ., Tehran, Iran

2 Prof., Mech. Eng., Tarbiat Modares Univ., Tehran, Iran

3 Mechanical Engineering Faculty, Tarbiat Modares University,Tehran,Iran

Abstract

Thermoplastic composite sheets have attracted increasing attention in various industries due to their high Specific strength and energy absorption capacity. In the upcoming research, the behavior of composite sheets with polyamide6 thermoplastic matrix and continuous glass fibers (PA6/GF) has been investigated under quasi-static penetration and drop weight test. Since the polyamide matrix is significantly sensitive to the effects of strain rate, the required mechanical properties at different strain rates were extracted by the Hopkinson test. Based on this test, the strength of the studied composite has grown by 47% at the same strain rate as the drop weight compared to the quasi-static penetration test. As a result of the impact, failure modes such as fiber breakage, separation of fibers from the matrix, vertical and horizontal cracks concerning to the direction of the fibers have been observed. Also, numerical simulation was performed with LS-DYNA software and the effects of strain rate extracted from Hopkinson's test were applied in numerical simulation, which brought the accuracy of the simulation to 9.6% in calculating the maximum force. Based on the results of numerical simulation, in thicknesses less than 2.5mm, the SAE of the composite sheet is constant; Also, the maximum energy absorption in 4-layer composites were related to the laminate [902/02] with 18J of energy absorption.

Keywords

References

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Journal of Solid and Fluid Mechanics
Volume 13, Issue 1
March and April 2023
Pages 1-13

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