Impact resistance of fibre reinforced composite railway freight tank wagons

Street, George; Mistry, Preetum; Johnson, Michael

Abstract

The use of fibre reinforced composite materials is one method by which the lightweighting of rail vehicles can be achieved. However, the issue of impact damage, amongst other challenges, limits their safety certification. This issue is accentuated by the high levels of loading a rail vehicle may be subjected to during service. This paper addresses the significance of pre-tension on large composite structures, specifically for a composite redesign of a pressure vessel for a freight tank wagon. Preloading was determined to be detrimental to the overall impact resistance of a large composite vessel. At 15.71 J of impact energy, there was a 22% increase in mean absorbed energy for a uniaxially loaded panel over an unloaded panel. However, there was only a 4% difference in penetration depth between uniaxial and biaxial loading. A novel finding from these results is that the effects of preloading are more profound if the loading does not act parallel to a principal fibre direction. Matrix cracking and delaminations are the most common failure modes observed for specimens under low-velocity impact and are intensified by preload.

• Journal Article Type: Article
• Acceptance Date: May 31, 2021
• Online Publication Date: Jun 4, 2021
• Publication Date: 2021-06
• Deposit Date: Jun 3, 2021
• Publicly Available Date: Jun 7, 2021
• Journal: Journal of Composites Science
• Peer Reviewed: Peer Reviewed
• Volume: 5
• Issue: 6
• Article Number: 152
• DOI: https://doi.org/10.3390/jcs5060152
• Public URL: https://nottingham-repository.worktribe.com/output/5622962
• Publisher URL: https://www.mdpi.com/2504-477X/5/6/152