成形加工限度としての曲げ破壊 : (第4報, せん断に対する抵抗の影響)

概要

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Shearing resistance of sheet materials has been evaluated to confirm the conception introduced in the previous report that the forming limit in bending is affected by shearing resistance. The ratio α=2τ_6/σ where σ : actual tensile stress at the uniform strain limit in pre-tension of shear specimen. τ_6 : proof stress in shearing test of pre-strained specimen in tension, is used to evaluated shearing resistance. The experiment has revealed that the forming limit in bending is affected by this ratio, and the forming limit of material which has small value of this ratio varies extremely with different thicknesses, and for thick material the forming limit approaches toward the value calculated under the condition that there is no shearing resistance, while the forming limit of material which has large value of this ratio is estimated under the supposition that the bending is not accompanied by shearing strain.
社団法人日本機械学会の論文