MATHEMATICAL MODELLING OF THE STRAIN HARDENING AND CREEP BEHAVIOUR OF ALUMINIUM ALLOY 2024-T3 AT ROOM AND HIGH TEMPERATURE
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- TITLE: MATHEMATICAL MODELLING OF THE STRAIN HARDENING AND CREEP BEHAVIOUR OF ALUMINIUM ALLOY 2024-T3 AT ROOM AND HIGH TEMPERATURE
- ABSTRACT: In this paper constitutive models of aluminium alloy 2024-T3 have been developed at room and high temperature in order to be used in finite element simulations of the manufacturing processes. The material behaviour in the plastic field has been described by the nonlinear kinematic hardening on the basis of uniaxial tensile test (half cycle) at 8 different temperatures in the range between 250C and 200 0 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 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 aluminium alloy 2024-T3 at high temperatures (150 0C – 200 0 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 expanded open holes due to thermal overloading.
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