17 Modal Analyses and Meta-Models for Fatigue Assessment of Automotive Steel Wheels 161 Fig. 17.4 Multiaxial index applied to high interference cases of radial and dynamic cornering cycles Fig. 17.5 Damage map: high interference radial (left) and high interference dynamic cornering at 2560 Nm (right) From Fig. 17.6 it is possible to observe that the McDiarmid criterion is conservative. Moreover, the increasing interference effect is more extended than the reducing one which means the main effect of interference is to lower the life of the component: it is then crucial to consider the interference effect during fatigue assessment. The experimental decrease of life in the overall confidence observed in dynamic cornering test by increasing rotating bending moment is confirmed in numerical results. Despite the limited region affected by interference, the effect is perceivable on the rest of the geometry. 17.6 Conclusion The stress-stiffening effect allows to relate the assembly stress-state during the fitting process to the geometry of the components. All geometrical differences from nominal shapes of several parameters are synthesised by measuring their effect as maximum fitting force changes. Thus, a direct link between the stress state condition and measurable variables, i.e.
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