Integration algorithm for J2 elastoplasticity under arbitrary mixed stress-strain control

This paper addresses the implementation of an integration algorithm for J2 elastoplasticity under arbitrary mixed stress{strain control. The proposed algorithm relies on the solution of a non-linear scalar equation and generalizes an integration method already available for strain-driven plane stress problems. Closed-form analytical expressions are presented for both the continuous and the consistent forms of the mixed control tangent operator. The e ciency and accuracy of the application of the proposed algorithm to several mixed stress{strain control cases (including plane stress and beam theory problems) are discussed