844 Optimum Deformation Value of Notched Specimen by Roller-working

Abstract

In this study, fatigue tests had been carried out to investigate the optimum value of deformation of notched specimen by roller-working. Here, the specimen which has a deformation value of 0.25mm is tested. The deformation values are 0,0.5 and 1.0mm to compare to the former testing results by keeping the final shapes and dimensions except for deformation value. The main results are obtained as follows : (1) The potimum value of deformation of notched specimen by roller-working is 0.5mm. (2) Fatigue strength of notched specimen by roller-working increase with increasing plastic deformation value when the deformation value is les than 0.5mm, but when the value is larger than 0.5mm the result is opposite.