鉛の機械的性質について(第二報)

Abstract

On this paper the author reports : - (i) tension test of cast lead, (ii) tensile elongation of annealed lead, (iii) tensil stress of annealed lead. And the brittleness number and the ductility number of general metals are proposed as following ; Let X, Y, Z. be the principal stresses and e_χ be the strain parallel to the axis of χ at a point in the material. If we have the condition, |X|>|Y|>|Z| then, brittleness number B can be defiened as B=100×(1-|e_χ|) measured at the beginning of local deformation on any mechanical rupture and ductility number D can be done as D=100×|e_χ| measured at the maximum load on the tension test.