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Fatigue characteristics of dual-phase steel sheets
Irwan Herman Onn,Norhayati Ahmad,Mohd Nasir Tamin 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.1
Fatigue characteristics of dual-phase steel sheets, commonly used in automobile body construction were established. For this purpose,a series of fatigue tests, each at constant stress amplitude were conducted on 1.2 mm-thick, dual-phase DP600 steel sheet specimens withtwo different load ratios of minimum-to-maximum stress, R = 0.1 and -1. The resulting fatigue behavior is expressed in terms of fatiguestrength-life (S-N) curves. Fatigue behavior of the steel sheets in the high-cycle fatigue region can be represented by Basquin’s equationwith coefficient and exponent value of 921.2 and 0.093, respectively. An endurance limit of 255 MPa is observed. In addition, fatiguestrengths of the dual-phase steel sheets display lower magnitude than their bulk counterparts. Effect of mean stress on fatigue behavior ofthe steel sheets is well predicted by Walker’s model. Exponential calibration factor is introduced to the models by SWT, Goodman andMorrow with comparable prediction to the Walker’s model.