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J. Compos. Sci. 2018, 2(3), 53; https://doi.org/10.3390/jcs2030053

Finite Element Analysis and Experimental Characterisation of SMC Composite Car Hood Specimens under Complex Loadings

Marine Additive Manufacturing Centre of Excellence (MAMCE), University of New Brunswick, 3 Bailey Drive, P.O. Box 4400, Fredericton, NB E3B 5A1, Canada
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Received: 7 July 2018 / Revised: 9 August 2018 / Accepted: 28 August 2018 / Published: 4 September 2018
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Abstract

Composite materials have recently been of particular interest to the automotive industry due to their high strength-to-weight ratio and versatility. Among the different composite materials used in mass-produced vehicles are sheet moulded compound (SMC) composites, which consist of random fibres, making them inexpensive candidates for non-structural applications in future vehicles. In this work, SMC composite materials were prepared with varying fibre orientations and volume fractions (25% and 45%) and subjected to a series of uniaxial tensile and flexural bending tests at a strain rate of 3 × 10−3 s−1. Tensile strength as well as failure strain increased with the increasing fibre volume fraction for the uniaxial tests. Flexural strength was found to also increase with increasing fibre percentage; however, failure displacement was found to decrease. The two material directions studied—longitudinal and transverse—showed superior strength and failure strain/displacement in the transverse direction. The experimental results were then used to create a finite element model to describe the deformation behaviour of SMC composites. Tensile results were first used to create and calibrate the model; then, the model was validated with flexural experimental results. The finite element model closely predicted both SMC volume fraction samples, predicting the failure force and displacement with less than 3.5% error in the lower volume fraction tests, and 6.6% error in the higher volume fraction tests. View Full-Text
Keywords: discontinuous reinforcement; glass fibres; uniaxial tensile tests; three-point bending tests; mechanical properties; finite element modelling discontinuous reinforcement; glass fibres; uniaxial tensile tests; three-point bending tests; mechanical properties; finite element modelling
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Kelly, J.; Cyr, E.; Mohammadi, M. Finite Element Analysis and Experimental Characterisation of SMC Composite Car Hood Specimens under Complex Loadings. J. Compos. Sci. 2018, 2, 53.

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