主応力方向が未知の場合の平板の残留主応力測定法

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  • Measurement of Principal Residual Stresses in a Plate when These Directions are Unknown
  • シュ オウリョク ホウコウ ガ ミチ ノ バアイ ノ ヘイバン ノ ザンリュウシュ オウリョク ソクテイホウ

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There are several methods to measure mechanically the residual stresses in simple shaped subjects such as flat plate, cylinders (solid or hollow) and shells. In these all cases, the directions of the principal stresses are already known and coincide with those of geometrical axes of the bodies. The author has published the Deflection Method to measure the 2 principal residual stresses in a plate and has given the analytical formula to calculate them by solving the integral equation. In general, there are some cases the directions of the principal residual stresses are unknown and their directions and values are required to be measured. In this report, the author proposes the analytical formula to find out the unknown directions and values of principal residual stresses existed in flat plates by applying the relations of elastisity in plate bending to the Deflection Method and shows the examples of measurements in rolled band saw strips.

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