Design and Optimisation of an RTM Composite Bicycle Crank

Abstract

This paper presents the activities performed for the design and optimisation of a new carbon fibre composite bicycle crank produced by using the RTM technology.

A prototype of the right crank was developed on the basis of a preliminary design supported by a finite element model. Its flexural and torsional stiffness performances were experimentally evaluated and compared with those of top quality commercial cranks showing the need for an improvement of the composite prototype stiffness. The FE model was then calibrated on the basis of the constituent material characterisation and the definition of suitable boundary conditions in order to achieve a reliable simulation of the experimental tests. Finally, an FE optimisation was performed to increase the crank stiffness and to investigate the influence of the elastic properties and lay-up of the composite skin on the stiffness performances.

Keywords

bicycle crank RTM design optimisation

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References

1. Meneghetti, G. , Quaresimin, M. and Fabbri, L. , “Optimisation of the Structural Performances of Racing Motorcycle Components,” Proceedings of the Power Two Wheels International Conference, Pisa, Italy, December 14-15, 1998, pp. 113-122.

2. Lazzarin, P. , Meneghetti, G. , Petrone, N. and Quaresimin, M. , “Structural Analysis of a Racing Motorcycle Composite Swing Arm,” Proceedings of the Second International Seminar “Experimental Techniques and Design in Composite Materials,” Sheffield, UK, September, 1994, M.S. Found Editor, Sheffield Academic Press, 1995, pp. 350-364.

3. UNI 10395-1994: “Bicycles—Safety Requirements” UNI, Milan, Italy, October 1994 (in Italian).

4. ISO 4210:1996E: “Cycles—Safety Requirements for Bicycles” Fourth Edition 1996-11-01.

5. ASTM D3039M-95, Standard Test Method for Tensile Properties of Polymer Matrix Composite Materials, American Society for Testing and Materials, Philadelphia, USA, 1995.

6. Meneghetti, G. and Quaresimin, M. , “FE Modelling of Box Sandwich Structures,” Internal Report C.M. 21-97, Department of Mechanical Engineering, University of Padova, 1997.

7. Lubin, G. , Handbook of Composites, Van Nostrand Reinhold, New York, USA, 1981.

8. Caprino, G. and Teti, R. , Sandwich Structures Handbook, Ed. Il Prato , Padova, Italy, 1989.