Abstract
Fatigue failures of driveline and suspension notched components for ground vehicles under multiaxial loading conditions are common, since most of those components are subjected to complex multiaxial loadings in service. A computational fatigue analysis methodology has been proposed here for performing multiaxial fatigue life prediction for notched components using analytical and numerical methods. The proposed multiaxial fatigue analysis methodology consists of an elastic-plastic stress/strain model and a multiaxial fatigue damage parameter. Results of the proposed multiaxial fatigue analysis methodology are compared to sets of experimental data published in the literature to verify the prediction capability of the elastic-plastic stress/strain model and the multiaxial fatigue damage parameter. Based on the comparison between calculated results and experimental data, it is found that the multiaxial elastic-plastic stress/strain model correlates well with experimental strain data for SAE 1070 steel notched shafts subjected to several non-proportional load paths. In addition, the proposed fatigue damage parameter is found to correlate reasonably well with experimental fatigue data of SAE 1045 steel notched shafts subjected to proportional and non-proportional loadings.
Highlights
Most driveline and suspensions components, such as axles and shafts for ground vehicles, are subjected to combined cyclic tension, bending and torsional loads during operations in service
The main goal of this paper develops and validates a numerically efficient multiaxial fatigue analysis methodology for notched components mainly used ground vehicle suspension and driveline systems
Implementation of the proposed multiaxial fatigue analysis methodology, which incorporates the proposed fatigue damage parameter based on the generalized strain amplitude and the elastic-plastic stress-train model is suitable for the design evaluation of notched components used in general engineering applications, especially ground vehicles
Summary
Most driveline and suspensions components, such as axles and shafts for ground vehicles, are subjected to combined cyclic tension, bending and torsional loads during operations in service. An incremental elastic-plastic finite element analysis for long loading histories would require impractically long computation times and excessive data storage. For these reasons, more efficient and simpler methods of elastic-plastic stress-strain analysis and fatigue life estimations are necessary for notched bodies subjected to lengthy cyclic load histories. Recent research studies [1,2,3] have shown that the notch correction method can be combined with the cyclic plasticity model to compute the local stress and strain history from the pseudo elastic stress and strain at the notch area. The multiaxial fatigue life prediction remains a challenging problem due to its general wide practical applications in general and the ground vehicle industry in particular; additional research studies should be still required for accurate and reliable multiaxial fatigue assessment
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