Theoretical Study of Glass Fibre Reinforced Polymer-steel Hybrid Thin-walled Twelve-right-angle-section Beams under Bending Loading

doi:10.3901/JME.2022.06.194

Abstract

Abstract: The twelve-right-angled-section thin-walled beams wrapped by composites have excellent bending characteristics and can be used in vehicle body bending safety components that take into account both crashworthiness and lightweight. A theoretical method and process is developed to get the bending characteristics of the twelve-right-angled-section thin-walled beams wrapped by composites for the design of automobile body. Firstly, the deformation characteristics in the bending failure area of the hybrid thin-walled beams are simplified into three kinds of energy dissipation mechanism：plastic hinge, rolling hinge and plane tension. Furthermore, the angle between the composite fiber direction and the rolling hinge motion direction is considered as instantaneous, the plastic limit bending moment and the energy dissipation expressions of these rolling hinges in the bending failure area of the hybrid thin walled beam is deduced theoretically, and the entire bending energy dissipation balance equation of the thin-walled beams is established. Finally, based on the minimum energy principle, the bending moment-rotation angle curve of the wrapped beam is gained. Comparison with the results of finite element analysis demonstrates that the theoretical analysis method employed in this study can accurately predict the performance of thin-walled beams.

Key words: composites wrapping metal thin-walled beams, twelve-right-angled-section, bending characteristics, theoretical analysis, plastic limit bending moment

CLC Number:

U463

CHEN Guang, WEI Chenyang, XIE Dongxuan, ZHENG Nanxian, FENG Yupeng, CHEN Yong. Theoretical Study of Glass Fibre Reinforced Polymer-steel Hybrid Thin-walled Twelve-right-angle-section Beams under Bending Loading[J]. Journal of Mechanical Engineering, 2022, 58(6): 194-201.

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