鋼の鍛造, 壓延, 絞り, 引抜材等に現われる屈曲内面疵(又は皺疵)の正體とその發生條件に就て

概要

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The auther formerly recognized that when a steel plate or bar was bent by compression, a defect which is a sort of flaws occured at the inside of bent part. As the result of study on the nature of flaws which was made by experiments under various conditions, following results were obtained. (1) The flaws are not caused by the deformation of surface layer of steel, but are caused by the fracture of steel itself due to partially concentrated stress at the inside of bent part. (2) The flaws occur in almost every kind of steel. (3) The depth of flaws differs according generally to the principles of strength of materials. (4) The flaws occur considerably affected by temperature, grain size and properties of surface of steel.
社団法人日本鉄鋼協会の論文
1950-03-25