Attempt to Measure Bending Strain of Copper Alloy Thin Plate

Abstract

Copper alloys for terminals need to have both strength and bendability. It is difficult to predict bending workability only from mechanical properties. Therefore, it was examined to experimentally measure the strain generated by bending and use it as an index of bendability. Materials with different mechanical properties were produced by changing the rolling reduction rate of cold rolling process. When processed under the same bending conditions, high cold rolling reduction material had more cracks and wrinkles than the low cold rolling reduction material. In addition, the surface strain measured experimentally increased with the increase of cracks and wrinkles. From the above, it was confirmed that the surface strain generated by bending affects wrinkles and cracks. The results of the analysis showed that the strains were almost the same, but the deformation on the compression side tended to have a large deviation from the actual experimentally measurement.