On the Deformation and Fracture of Granite (Part II)

In this paper, creep tests made on granite specimens under a uniaxial compressional pressure are reported. It has been found, as previously inferred, that the flow rate in lateral direction becomes larger than that in axial direction with increasing load. Near or in the fracture range, the lateral flow becomes some hundred times as large as the longitudinal one. This result conforms in tendency to the variation of Poisson's ratio with load which was reported in the previous paper.Referring to the recovery and stress-strain curves, it is suggested that granites show different behaviors simultaneously in different directions under a uniaxial compression; that is elastic in the direction of the applied stress and plastic in the direction perpendicular to it.