RESIDUAL STRESS MEASURING METHOD FOR METALLIC MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a method for easily and accurately measuring a residual stress distribution of a metallic material at a metallic structure level in a whole area of a sample even if the sample is relatively large.;SOLUTION: A method for measuring residual stress on a metallic material includes: a step S1 of acquiring a crystal orientation distribution from a backscattered electron diffraction pattern of a metallic material; a step S2 of calculating lattice strain between adjacent lattice points from the crystal orientation distribution; a step S3 of calculating plastic strain from dislocation density indicated by a difference in orientation in the crystal orientation distribution; a step S4 of calculating elastic strain from a difference between the lattice strain and the plastic strain; a step S5 of plastically deforming the metallic material by applying a predetermined load to it, executing steps S1 to S4 again to the plastically-deformed metallic material, and measuring a coordinate displacement on a surface of the plastically-deformed metallic material; and a step S6 of associating a coordinate before the plastic deformation with the coordinate after the plastic deformation on the basis of the coordinate displacement, and obtaining a difference in a residual stress component between before and after the plastic deformation.;COPYRIGHT: (C)2013,JPO&INPIT