Abstract： In order to meet the demand of practical application of steel for automobile stabilizer bar, the low cycle fatigue properties of 55Cr3 spring steel were tested with axial strain control method under the following conditions: the stress cycle ratio (R) was -1; the test frequency was in range of 0.1-1.0 Hz; the loading waveform for fatigue test was a triangular wave; the total axial strain range was set to 0.35%-1.2%. The test data were calculated and fitted to obtain the cycle stressstrain curve, strainlife curve and transitional fatigue life of 55Cr3 spring steel. The formula for predicting the low cycle fatigue life of 55Cr3 spring steel was obtained through fitting the Basquin and CoffinManson equations, and the R2 value in fitting was higher than 0.9. The fatigue fracture analysis indicated that the cracking of 55Cr3 spring steel originated from the surface of the sample. There were many sources of cracks, which were then propagated inward together until ultimate fracture.
2022, Vol. 40 
