Title: Fatigue strength of hard-chromium-plated handlebars

Authors: Alessandro Guglielmotti, Carmine Lucignano, Fabrizio Quadrini, Erica Anna Squeo, Federica Trovalusci

Addresses: Department of Mechanical Engineering, University of Rome Tor Vergata, Via del Politecnico 1, 00133 Rome – Italy. ' Department of Mechanical Engineering, University of Rome Tor Vergata, Via del Politecnico 1, 00133 Rome – Italy. ' Department of Mechanical Engineering, University of Rome Tor Vergata, Via del Politecnico 1, 00133 Rome – Italy. ' Department of Mechanical Engineering, University of Rome Tor Vergata, Via del Politecnico 1, 00133 Rome – Italy. ' Department of Mechanical Engineering, University of Rome Tor Vergata, Via del Politecnico 1, 00133 Rome – Italy

Abstract: Prototypes of handlebars for motorcycles were fabricated by rotary bending and hard-chromium electrodeposition. Fatigue tests were carried out on rough handlebars and hard-chromium plated handlebars; the former resisted over 200.000 cycles, the latter failed at about 50.000 cycles. Scanning Electron Microscopy (SEM) allowed one to observe the presence of sub-surface cracks, which probably originated during the tube bending. Moreover numerical simulation permitted one to identify the occurrence of buckling during the bending process. The combination of buckling, cracks and residual stresses from the chromium electrodeposition results in a very poor behaviour of the handlebar under fatigue test.

Keywords: hard chromium plating; fatigue strength; motorcycle handlebars; SEM; scanning electron microscopy; FEM; finite element method; motorbikes; rotary bending; chromium electrodeposition; sub-surface cracks; tube bending; buckling; residual stress.

DOI: 10.1504/IJSURFSE.2008.021349

International Journal of Surface Science and Engineering, 2008 Vol.2 No.5, pp.376 - 384

Published online: 20 Nov 2008 *

Full-text access for editors Access for subscribers Purchase this article Comment on this article