FEA analysis and optical measurement of city bus composite floor structure

Abstract

Polymer composites have various application in automotive industry. Achieving vehicle efficiency in public transportation, among other goals, is often done by lightweight materials like fibre reinforced plastics as structural elements of the vehicle. A concept solution for a V shaped structural floor element of a city bus is proposed in this paper. CAD model of floor structural element has been designed from which, in later phases, construction of complete composite floor will be optimized and designed. Test sample made of hybrid (carbon and glass) fibre composite was produced and tested under the flexural load for comparison with a FEA model. Test sample displacement was measured using a GOM Tritop optical measurement system. Comparison showed that difference between real measurement and FEA for maximal displacement is only 11.7%.

Keywords

• carbon fibre
• flexural displacement
• FEM
• glass fibre
• hybrid composites
• optical measurement

References

1. Bartus S., Vaidya U., Ulven C., “Design and Development of a Long Fiber Thermoplastic Bus Seat,” Journal of Thermoplastic Composite Materials, vol. 19, no. March 2006, pp. 131–154, doi: 10.1177/0892705706062184.
2. "https://www.lamilux.com/composites/branches/bus-industry.html.” https://www.lamilux.com/composites/branches/bus-industry.html., consulted 14.9.2021.
3. Mary Lou Jay "Composites power efficiency in electric buses", Composite Manufacturing Magazine, May 2020., http://compositesmanufacturingmagazine.com/2020/05/composites-power-efficiency-in-electric-buses/., consulted 15.9.2021.
4. P. C. Neves, A. J. M. Ferreira, and A. A. Fernandes, “LITEBUS - MODULAR LIGHTWEIGHT SANDWICH BUS CONCEPT,” 2010., consulted 15.9.2021.
5. "https://www.proterra.com/timeline-event/the-ecoride/.” https://www.proterra.com/timeline-event/the-ecoride/ consulted 15.9.2021.
6. “https://de-academic.com/dic.nsf/dewiki/1009300", consulted 15.9.2021.
7. Donna Dawson "A clean technology for clean zero emission-buses", Composites World, October 2018., https://www.compositesworld.com/articles/a-clean-technology-for-clean-zero-emissions-buses, consulted 16.9.2021.
8. O. Testoni, “Concept and Preliminary Design of a Composite Monocoque for an Electric City-Bus,” 2015.

9. M. P. M. Delogu, L. Zanchi, C.A. Dattilo⁎, “Innovative composites and hybrid materials for electric vehicles lightweight design in a sustainability perspective,” Mater. Today Commun., vol. 13, pp. 192–209, 2017, doi: 10.1016/j.mtcomm.2017.09.012.
10. Tujmer M., “Application of composite materials for a structural floor panel in a commercial vehicle,” Master thesis FSB Zagreb, 2021., https://zir.nsk.hr/islandora/object/fsb:7195
11. M. Horvat, “Application of optical measurement system in analysis of Formula student race car chassis,” FSB Zagreb 2017, https://urn.nsk.hr/urn:nbn:hr:235:254390
12. I. Goda, G. L’Hostis, and P. Guerlain, “In-situ non-contact 3D optical deformation measurement of large capacity composite tank based on close-range photogrammetry,” Opt. Lasers Eng., vol. 119, pp. 37–55, 2019, doi: 10.1016/j.optlaseng.2019.02.006.
13. “HRN EN ISO 14125:2005 Fiber reinforced plastic composites - Determination of flexural properties”