Abstract
The literature shows that nonlinear stress-strain curves have been obtained in tensile tests of 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 in specimen is expected. The present theoretical analysis based on the linear theory of poroelasticity shows how much the pore-fluid diffusion contributes to the nonlinearity and concludes that this apparent non-linearity is small but not negligible. A formula is given to estimate how much a stress-strain curve bends due to the diffusion.
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