Abstract:
In this study, a numerical method has been developed
to estimate the fatigue life of the vehicle chassis-components. The application
of this method will significantly reduce the expenses for the required
practical or in-service tests. In this method, firstly, using MATLAB,
the real but random profiles for the standard roads have been produced
on the basis of the random vibration theories, which give the spatial
profile data in terms of time. These profiles have been used to study
the dynamic behavior and to design the vehicle chassis. Then, a complete
off-road-vehicle model has been developed and first-stage results have
been used as input data to simulate the dynamic behavior of the model
and to calculate the forces and displacements of the chassis structure
using MSC.ADAMS. In this way, the optimum stiffness of the suspension
system has been obtained. Finally, using the FEM based software; ANSYS,
the stress distribution in a selected part-weldment (support of the front
suspension system) has been obtained and fatigue life of the structure-components
welds; joining the suspension system to the off-road vehicle chassis,
has been calculated and the effects of the dynamic loads due to the road
profiles have been studied.
F. Vakili-Tahami, M. Zehsaz and M.R. Alidadi, 2009. Fatigue Analysis of the Weldments of the Suspension-System-Support for an Off-Road Vehicle under the Dynamic Loads Due to the Road Profiles. Asian Journal of Applied Sciences, 2: 1-21.
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