切欠きを有するZn-Al超塑性材の引張変形挙動

概要

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To examine the mechanical behavior of sheet metal forming under strain or stress gradient, tensile test of notched Zn-Al superplastic alloy sheets was carried out under the conditions of several elevated temperatures and tensile speeds. A constitutive equationσ=Kε^^・^mε^n was applied to the plastic flow of the material. It was found that strain distributions on the net section, the direction of principal axes and the ratio of principal strains in plane were determined by the notch shape only i.e. initial depth and root radius of notch. And, maximum longitudinal stress on the net section moved from root to center with increase of elongation. Therefore, notched specimen deformed up to the ultimate ductility of material, if this maximum stress was not beyond the inherent stress. Furthermore, the propagation of strain in the longitudinal direction of specimen was determined not by m-value and n-value but also by factor Kε^^・^mε^n/exp ε.
社団法人日本機械学会の論文
1985-08-25