Journal
COMPOSITE STRUCTURES
Volume 248, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2020.112523
Keywords
Vehicle design; Roof panel; Stiffness-to-weight ratio; Carbon fiber reinforced polymers; Sandwich-structured composites; Modal analysis; Resonance frequency; Layered-shell
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Funding
- Italian Ministry of Foreign Affairs and International Cooperation (MAECI)
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The effects of vibrations in vehicles range from simple noise and reduced comfort, to decreased performance, from wear and material fatigue to irreversible failures and danger. A study of the dynamic behaviour of rein-forced composite panels is here presented, applied to the construction of an ultralight photovoltaic roof in the case of a solar sport car. This is an extreme race prototype where design and materials solutions, as high strength carbon fiber reinforced polymers and sandwich-structured composites, were addressed to optimize the stiffness-to-weight ratio. A modal analysis was performed considering materials anisotropies by a layered-shell finite element model and through-the-thickness integration points with the scope to discretize the multi-layered sandwich structure. Additional aspects, as gravity force and external constrains, were also included. Experimental evidences were used for validating the numerical model and underscored an outstand-ing accuracy. The same design procedure was finally applied to change the preexisting structural solution achieving an optimized roof that was manufactured, installed and tested.
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