Effect of thickness on the pure stretchability of sheet metals.

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  • 金属薄板の純粋張出し深さに及ぼす板厚の影響
  • キンゾク ウスイタ ノ ジュンスイ ハリダシフカサ ニ オヨボス イタアツ ノ

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Recently, the thinning and strengthening of sheet metal is of importance for conserving natural resources and energy. In this paper, the effects of the thicknesses, lubricants and temper of metals on the pure stretchability of aluminum sheets are studied. The pure stretchability of sheet metals deteriorates with a decrease in thickness. The optimum frictional coefficient, which gives a maximum of critical forming depth, was found in this experiment. The thickness dependence of the critical forming depth was analytically calculated by means of Hill's diffuse neck criterion, Yamaguchi's method based on M-K theory and the criterion proposed by Gotoh, and results were discussed in detail.

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