Abstract
On the basis of σm-constant plane strain test results, a double-hardening elasto-plastic model is proposed. An associated flow rule is employed for plastic compressive strain, and a non-associated flow rule for plastic shear strain. The failure criterion, yielding function and work-hardening parameter are discussed. Applying the model to σ3-constant plane strain condition, the predicted results showed good agreement with the test results. The same procedure of modeling is also carried out for a series of triaxial compression tests and the same conclusion is obtained. Finally, by comparing the parameters obtained from the triaxial and plane strain tests noted above, the generalization and extension of the model is discussed.
