Variation of Fatigue Threshold of Spring Steel with Pre- stressing

N. GUBELJAK; CHAPETTI, M D; J. PREDAN; S. BOJAN

Procedia Engineering

Elsevier SCI LTD

Año: 2011 vol. 10 p. 3339 - 3344

1877-7058

High strength steel grade 51CrV4 in thermo-mechanical treated condition is used as bending parabolic spring of heavy vehicles. Several investigations show that fatigue threshold for very high cycle fatigue depends on inclusion’s size and material hardness. In order to determine allowed size of inclusions in spring’s steel the Murakami´s and Chapetti´s model have been used. The stress loading limit regarding to inclusion size and applied stress has been determine for loading ratio R=-1 in form of S-N curves. Experimental results and prediction of S-N curve by model for given size of inclusion and R ratio show very good agreement. Pre-stressing and shot-peening causes higher compress stress magnitude and consequently change of loading ratio to more negative value and additionally extended life time of spring.