Abstract:
A Computational methodology is proposed for fatigue damage assessment of metallic automotive components and its application is presented with numerical simulations of wheel radial fatigue tests. The technique is based on the local strain approach in conjunction with linear elastic FE stress analyses. The stress-strain response at a material point is computed with a cyclic plasticity model coupled with a notch stress-strain approximation scheme. Critical plane damage parameters are used in the characterization of fatigue damage under multiaxial loading conditions. All computational modules are implemented into a software tool and used in the simulation of radial fatigue tests of a disk-type truck wheel. In numerical models, the wheel rotation is included with a nonproportional cyclic loading history, and dynamic effects due to wheel-tire interaction are neglected. The fatigue lives and potential crack locations are predicted using effective strain, Smith-Watson-Topper and Fatemi-Socie parameters using computed stress-strain histories. Three-different test conditions are simulated, and both number of test cycles and crack initiation sites are estimated. Comparisons with the actual tests proved the applicability of the proposed approach. (C) 2008 Elsevier Ltd. All rights reserved.
