Compressive residual stress relaxation behavior of shot peened AISI4140 steel during first cycle of repeated loading

Author:  Motoaki Hayama1 and Jun Komotori2 1 Graduate School of Science and Technology, Keio University, Japan 2 Department of Mechanical Engineering, Keio University, Kanagawa, Japan
Source:  ICSP14 Milan
Doc ID:  2022071
Year of Publication:  2022
Abstract:  
Abstract This study aims to reveal the relaxation behavior of the compressive residual stress induced by shot peening during the first cycle of cyclic loading. An hourglass-type specimen was machined from AISI440 steel, and the surface was shot peened using high-speed steel. The relaxation behavior of the compressive residual stress was investigated using an in-situ Xray stress measurement method. Results shows that the compressive residual stress relaxation occurred during the compression process of the first fatigue loading, and the relaxation occurred continuously after the first cycle. Keywords Residual stress, Relaxation, in-situ X-ray measurement, fatigue