Controling directionality of aluminium sheet (5th Report)

In practics, the sheet is usually produced by one way rolling, because it is easier than any other method in the productive works. When we use a sheet, the question is whether it has a directionality or not. An experiment was performed recently, with aluminium sheets to eliminate the influence of the directionality by adding certain elements. The detection of directionality is usually achieved by various methods, and we have suggested several new methods of detecting the directionality for industrial use, and could detected the directionality by means of the damping capacity (the logarithmic decrement) in cantilever type transverse oscillation when it was necessary to know exactly the direction affected by hard working so much that there is no way except the X-ray analysis, for example, the rolled material in cross pass.We examine newly the directionality by measuring the damping capacity of the cladded sheets of 2S manufactured by a certain factory for the purpose of eliminating the influence of directionality. In the case of a cladded sheet, as there is a difficulty in preparing test pieces. for X-ray analysis, we think that this method is very useful when it is necessary to exactly detect the directionality. The result seems to show that there is slight directionality in the sheets. Further, we mention the connection between this method and other methods by tension and other tests.