Abstract
Experimental results from biaxial (plane-strain) deformation of a sandstone demonstrate formation of a shear-band within the hardening regime. Evaluation of the plastic hardening modulus at initiation of the shear-band is made on the basis of the measured stress-strain data and is compared with the results of a bifurcation analysis. This modulus is greater than the critical hardening modulus derived from a Mohr-Coulomb type yield criterion as well as greater than that derived from a Drucker-Prager type yield criterion. A coupled flow/damage theory for friction and dilatant materials is therefore investigated for description of this behaviour. The model predicts a slight increase with increasing confining pressure of the angle that the shear band makes with the maximum principal axis of compressive stress. -from Authors
| Original language | English |
|---|---|
| Pages (from-to) | 1731-1735 |
| Number of pages | 5 |
| Journal | Computer methods and advances in geomechanics |
| Publication status | Published - 1 Jan 1992 |
| Externally published | Yes |
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