Title: Study on strain-rate-dependent behaviour and constitutive model of long glass fibre reinforced polypropylene composite

Authors: Shuyong Duan; Fuhao Mo; Kai Wei; Zhi Xiao; Sen Xiao; Xujing Yang; Yourui Tao

Addresses: School of Mechanical Engineering, Hebei University of Technology, Xiping Road No. 5340, Beichen District, Tianjin, 300401, China ' The State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Yuelu Mountain, Changsha, Hunan, 410082, China ' The State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Yuelu Mountain, Changsha, Hunan, 410082, China ' The State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Yuelu Mountain, Changsha, Hunan, 410082, China ' School of Mechanical Engineering, Hebei University of Technology, Xiping Road No.5340, Beichen District, Tianjin, 300401, China ' The State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Yuelu Mountain, Changsha, Hunan, 410082, China ' School of Mechanical Engineering, Hebei University of Technology, Xiping Road, No.5340, Beichen District, Tianjin, 300401, China

Abstract: Accurate material model under different strain rates (˙ε) is important for numerical simulations in vehicle design and crashworthiness assessment. Therefore, the objectives of this study are to develop the constitutive model of long glass fibre reinforced polypropylene composite (hereinafter referred to as 'LGFRP') which related to strain rate range of 10-3/s-50/s. Tensile and compression tests are conducted at different strain rates. The experimental results show that the failure strain and ultimate strength increase as increasing strain rate. The elastic modulus is sensitive to strain rate in tensile tests, but less sensitive to strain rate in compression tests. According to the experimental results, a novel constitutive model proposed by the authors is used to represent stress-strain relationship related to strain rate of the LGFRP. The analysis results show that the novel constitutive model agrees well with the experimental results.

Keywords: long glass fibre; constitutive model; strain rate; thermoplastic resin.

DOI: 10.1504/IJAUTOC.2018.094856

International Journal of Automotive Composites, 2018 Vol.4 No.1, pp.1 - 14

Received: 07 Dec 2016
Accepted: 04 Sep 2017
Published online: 25 Sep 2018 *

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