Abstract
The literature shows that nonlinear stress-strain curves have been obtained in tensile tests of an epoxy-coated hourglass-shaped rock specimen under confining pressures and concludes that this nonlinearity is caused in part by plasticity and mainly by nonlinear elastic behavior. However, in addition to these causes, some contribution of the pore-fluid diffusion is expected. The abovementioned specimen was examined in the previous paper. The present analysis for a noncoated cylindrical specimen (core sample) shows the contribution of the radial pore-fluid diffusion to the nonlinearity and gives the same conclusion as that in the previous paper ; that is, this apparent nonlinearity is small but not negligible. A formula is given to estimate the bend of the stress-strain curve due to the diffusion. Furthermore, sress-strain hysteresis curves are given for the same purpose.
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