日本金属学会誌

J. Japan Inst. Metals, Vol. 31, No. 7 (1967),
pp. 916-921

Strain Rate Effect on the Shearing of a Steel Sheet (Study on the Dependence of Mechanical Properties of Metals upon the Strain Rate, 5th Report)

Masanobu Ohmori1 and Yoshitoyo Yoshinaga1

1Faculty of Engineering, Hiroshima University, Hiroshima

Abstract:

Using a parallel-straight-edged shearing tool, the behaviors in shearing of the annealed sheet, 0.6 mm in thickness, made from a killed carbon steel with 0.14%C were investigated, as a function of the shear rate, in a wide range of rates from 1.1 × 10-2 to 2.8 × 104 l/sec. The present main findings are summarized as follows:
(1) The present shearing resistance has two strain rate sensitivities, i.e., a larger sensitivity beyond the rate of 1 l/sec and a much smaller one below the rate of it as the deformation resistances under the other states of stress such as simple tension, compression and torsion have two sensitivities, respectively. The shearing resistance, though it is somewhat smaller than the maximum shearing stress observed under simple torsion of the thin walled cylinder, increases with the shear rate in quite parallel with the maximum shearing stress.
(2) Defining the tensile and shear strain rate which should give an equal octahedral shear rate as an equivalent strain rate, the ratio of the shearing resistance to the tensile strength in a higher speed deformation was found to be appreciably smaller than the ratio 0.78 obtained in a quasi-static deformation.
(3) When the sheet was sheared in an impact manner with the present highest rate of 2.8 m/sec, the sheared edge showed the change characterized by the slight decrease of shear droop. However, no change was found in the edge at lower rates than 2.8 m/sec.


(Received 1967/4/24)

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