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A recently proposed hyperelastic model for granular materials, called “granular elasticity,” identifies a yield angle as a result of thermodynamic instability. GE gives yield angles that are smaller than those found in real materials; a generalization of the theory is considered here that includes dependence on the third strain invariant. This generalization proves unsuccessful, as it gives smaller, not larger, yield angles. Fully convex hyperelastic models are identified as a point for future investigation.

‘Granular Elasticity’ and the loss of elastic stability in granular materials