STRAIN MEASUREMENT METHOD IN METALLIC MATERIAL

• Main Authors: KOCHI TAKUYA, MURAKAMI TOSHIO, YODA RIKA, NAKATA TOSHIYA
• Format: Patent
• Language: English; Japanese
• Published: 14.07.2016
• Subjects: MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; PHYSICS; TESTING

PROBLEM TO BE SOLVED: To provide a strain measurement method in a metallic material, capable of associating strain formed following to deformation, with a metallic material fabric, and properly and quickly grasping the strain.SOLUTION: A strain measurement method comprises: a first step for exposing a surface of a metallic material; a second step for forming a reference material layer; a third step for observing the metallic material surface; a fourth step for applying external stress to the metallic material; a fifth step for observing the metallic material surface; and a sixth step for calculating horizontal movement distance of the reference material layer. based on difference between an image observed in the third step, and an image observed in the fifth step. The reference material layer covers 20 area% or more and 80 area% or less of a predetermined area of the metallic material surface.SELECTED DRAWING: None 【課題】変形に伴って形成される歪みを、金属材料組織と対応させつつ正確に且つ迅速に把握できる金属材料中の歪み計測方法を提供する。【解決手段】金属材料の表面を露出させる第１ステップと、該金属材料表面に、参照材料層を形成する第２ステップと、該金属材料表面を観察する第３ステップと、前記金属材料に外的応力を加える第４ステップと、該金属材料表面を観察する第５ステップと、前記第３ステップで観察された像と前記第５ステップで観察された像との差により前記参照材料層の水平移動距離を算出する第６ステップとを有し、前記参照材料層は、前記金属材料表面の所定領域の２０面積％以上、８０面積％以下を覆うものである。【選択図】なし