With the advent of high-temperature-resistant materials in the sheet-metal industry, it is becoming increasingly important to treat the subject of minimum or “critical” bend radius analytically. A simple equation is presented that correlates the minimum bend radius with the percentage reduction of area of the material. The theoretical derivation as well as experimental data are given, with very good agreement between the two. Consequently, it is possible to predict the minimum bend radius for a specific material, provided that the percentage reduction of area, as determined by a standard tensile test, is known. The relationship applies equally well to metals and nonmetals.

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This paper is the result of an analytical and experimental study of the effect of the physical properties of a material on its machinability. The physical properties studied were: the total stress-strain relations; the hardness; the microstructure; the abrasiveness; the thermal properties. A variety of ferrous and nonferrous materials were selected with a large range of the physical properties. A relationship is derived by means of which it is possible to calculate the culling speed for a given tool life from the physical properties of the work material.

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