Recent developments achieved in China about the centre hole relaxation technique for residual stress measurement

摘要

The paper introduces recent developments achieved in China regarding the centre hole relaxation technique for residual stress measurement. A special device developed by the author for the small blind hole drilling and measuring is described. Some examples of application of this method by using this special device are given. They include stress measurement of:(i) Stiffened top flange of the test section of a railway steel box girder bridge.(ii) The butt weld joints of the ‘15 MnVNi’ alloy steel thick plates.(iii) The welded side frames of a diesel l