Electron diffraction method of determining the degree of fatigue for metallic materials
 The degree of fatigue of a metallic material is determined by the linear relationship found to exist between the means angles of orientation deviation calculated from the electron diffraction patterns obtained by the selected field method and the degrees of fatigue. This method is justified because the mean angles determined near the fatigue crack and those determined at places removed therefrom differ only a little, meaning that determination of degree of fatigue can be conducted without being influenced by the location of sample taking. 
Electric Power Research Institute, Inc.
G
G01N
inventional
Hisae Yukiya G.
Yoshizawa Nakagawa