The hardening moduli are coupled by the following relation (1D).
k = (1 / ft,x + 1 / fc,x)² ⋅ Ex ⋅ Ep / (Ex - Ep)
More information about hardening can be found in this technical article:
Considering Hardening in Orthotropic Plastic Analysis
In RFEM, orthotropic plastic analyses using the Tsai‑Wu plasticity criterion have been possible for quite some time now. The hardening modulus Ep,x or Ep,y can be used to consider the hardening of the material during the iterative calculation.
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