Modeling of strain hardening and creep behaviour of 2024T3 aluminium alloy at room and high temperatures

In this paper constitutive models of 2024-T3 aluminium alloy have been developed at room and high temperatures in order to be used in finite element simulations of cold hole working process. The material behaviour in the plastic field has been described by the non-linear kinematic hardening on the basis of uniaxial tensile test (half cycle) at 8 different temperatures in the range between 25 °C and 200 °C. The dependence of the yield stress at zero plastic strain and the kinematic hardening modulus C on the temperature have been established when the material parameter γ is equal to 10. The latter determines the rate at which C decreases with increasing plastic deformation. The constitutive model authenticity has been proved by finite element simulations of the uniaxial tensile tests. The creep behaviour of the 2024-T3 aluminium alloy at high temperatures (150-200 °C) has been described by the power-law model. The model material parameters A, n and m have been determined as functions of the temperature on the basis of uniaxial creep test. The constitutive model authenticity has been proved experimentally and by finite element simulations of the creep test. The obtained constitutive models have been used in finite element simulations of residual stress relaxation around cold worked open holes due to thermal overloading.