engleski

FATIGUE CRACK INITIATION AND PROPAGATION MODELLING USING A CYCLIC PLASTICITY CONSTITUTIVE FORMULATION

This paper presents an experimental and numerical study of the cyclic deformation and low-cycle fatigue behaviour of the aluminium alloy AlCu5BiPb–T8. The experimental program included monotonic tensile tests, symmetric and unsymmetric strain-controlled fatigue tests, ratcheting strain accumulation, fracture toughness tests, as well as fatigue crack propagation tests. Within the framework of numerical investigations an efficient algorithm for modelling of cyclic plasticity is proposed. The material model is based on multi-component forms of isotropic and kinematic hardening variables in conjunction with von Mises yield criterion. The computational algorithm is implemented into the finite element program ABAQUS and applied to the analysis of a crack growth near the notch. The accuracy of the computational procedure is tested by comparing the computed results with the real experimental data.

Low-cycle fatigue; aluminium alloy; experiment; finite element modelling; cyclic elastoplasticity; integration algorithm; crack growth

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