Stress Measurement Using Grain Orientation of Copper Foil

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  • 銅薄膜の結晶方位を利用した応力測定法
  • ドウ ハクマク ノ ケッショウ ホウイ オ リヨウ シタ オウリョク ソクテイホウ : マゲ ト ネジリ オ ウケル カクチュウ ノ オウリョク ブンプ
  • - Stress Distribution of Prismatic Bar Under Bending and Torsion -
  • －曲げとねじりを受ける角柱の応力分布－

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Stress distribution of prismatic bar with 8mm square cross section was measured using the grain growth in an electrodeposited copper foil. The copper foil was adhered to the prismatic bar subjected to cyclic bending-torsion loading. A Schenck-type fatigue testing machine was used, and tests were performed at a frequency of 60 Hz by mounting the bending-torsion fixture in the test machine. The crystallographic orientations of individual grains that undergo grain growth in the foil were analyzed by electron backscatter diffraction (EBSD). Since the grain orientation was controlled by the cyclic stress, {110} pole figure and orientation imaging microscopy (OIM) mapping in an area of 0.18-0.25 mm2 were used for measuring the distribution of biaxial stress ratio on a surface of the prismatic bar. Stress distributions obtained by both methods agreed well with the theoretical solution. It was clarified that he method using {110} pole figure can measure the principal stress more accurately than the method using OIM mapping.

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