Standardized and technological testing of fatigue strength of spring steels is a complex and time consuming, and therefore an expensive task. Determination of S-N curves with a resonant pulsator is much faster and simpler. Testing is performed on simple standard Charpy V-notched samples. But, it is necessary to consider the notch effect for the reliable comparison with the results of structural testing of real springs. Fatigue strength of 51CrV4Mo spring steel was analysed. The influence of microstructure, residual stresses and surface quality are also discussed.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 610986The 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. Simultaneously, structural testing of real leaf springs for trucks was performed at selected conditions of fatigue and their life time was determined. The FEM-based calculated life time of the springs is in good agreement with its real life time.
B.04 Guest lecture
COBISS.SI-ID: 684970