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Fatigue crack growth in aluminium alloy AlCu5BiPb

During the service life many engineering components are subjected to complex cyclic loading and fatigue fracture. The purpose of this paper is to present the implementation of a robust cyclic plasticity theory for describing material behaviour near the crack tip in such loading case. The material used in experiment is the aluminium alloy AlCu5BiPb-T8. The experimental procedure included monotonic tensile tests, symmetric and unsymmetric strain-controlled fatigue tests, fracture toughness tests as well as fatigue crack propagation tests. Cylindrical specimens and single edge notch bend (SENB or three-point bend) specimens were used according to the standards ASTM EN 606 and ASTM E1820. Numerical 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 in the software 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; crack growth; aluminium alloy

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