(2)
where ε is the strain in mm/mm; σ is the stress in MPa; Young’s modulus E =167,000 MPa; C0 =1.0435;(Rtp0.2)moy =288 MPa; and α =37.88.
The Chaboche combined hardening model considers both kinematic and isotropic hardening. In the combined hardening model, the yield functionF is defined as: