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Fatigue strength of spring steels and life-time prediction of leaf springs
Šuštaršič, Borivoj ; Senčič, Bojan ; Leskovšek, Vojteh
Bend fatigue strength of 51CrV4Mo spring steel was determined with a resonant pulsator using standard Chrapy V-notched specimens. The finite element method (FEM) based numerical simulation was used ...for the determination of stress and strain distribution in V-notched specimens as well as for the calculation of stress concentration and notch-sensitivity factors. Bend fatigue strength of the selected unnotched spring steel was then determined considering stress concentration in the notch. The corresponding S-N curve was also constructed. Simultaneously, structural testing of real leaf springs for trucks was performed at selected conditions of fatigue and their life time was determined. FEM simulation of fatigue was used for the prediction of life time of springs, taking into account the selected leaf spring geometry, the mechanical properties of spring steel and conditions of fatigue. The calculated life time of the springs is in good agreement with its real life time. In the present paper fatigue strength of spring steels determined with aresonant pulsator, as well as FEM numerical based simulation of the notch effect in V-notched specimens and fatigue life-time prediction of leaf springs are presented.
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