On the Impact Torsional Test by Means of a Dropped Bar

概要

論文の詳細を見る
In the present paper we describe the impact torsional stress of a circular bar supported horizontally and subjected to impact torsion, when a cross pin attached to the end of it was struck by a dropped bar. Stresses obtained by experiments were in good agreement with those by one dimensional theory except for the short time after the impact. Therefore it was found that the torsional stress by the present method was approximately estimated by one dimensional theory in relation to dimensions of the dropped bar and the circular bar, material constants of them and the length of the cross pin. In addition, on the basis of the above results an impact torsional testing device of Hopkinson bar type was designed and some experiments were carried out with thin tubular specimens of a low carbon steel (SS41). Torsional stress-strain relations of the material under high strain rates (about 10^2/s) were compared with compressive ones. As a result, it was shown that Mises' yield condition was valid under high strain rates as well as low strain rates.
一般社団法人日本機械学会の論文