Fatigue Properties of the high strength hot rolled steel sheets with punched hole

摘要

From the practical use of the high strength hot rolled steelsheets, fatigue is one of the most important prac- tical propertiesand the prevention of the initiation of fatigue crack from thepunched hole and edge of the parts are significantly important. Theendurance limit of the specimen with a punched hole decreased withthe increase of the clearance of punching. The higher the tensilestrength is, the larger the influence of the clear- ance on theendurance limit becomes linearly.