FATIGUE CRACK PROPAGATION UNDER VARIABLE AMPLITUDE LOADING ANALYSES BASED ON PLASTIC ENERGY APPROACH

Plasticity effects at the crack tip had been recognized as "motor" of crack propagation, the growth of cracks is related to the existence of a crack tip plastic zone, whose formation and intensification is accompanied by energy dissipation. In the actual state of knowledge fatigue crack pr...

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Bibliographic Details
Published in:Materiálové inžinierstvo 2014-01, Vol.21 (2), p.68-79
Main Authors: Maachou, Sofiane, Benguediab, Mohamed, Mazari, Mohamed, Ranganathan, Narayanaswami
Format: Article
Language:English
Subjects:
Aluminum base alloys
Blocking
Constants
Crack propagation
Cracks
Dissipation
Fatigue failure
Hysteresis
Variable amplitude loading
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Summary:Plasticity effects at the crack tip had been recognized as "motor" of crack propagation, the growth of cracks is related to the existence of a crack tip plastic zone, whose formation and intensification is accompanied by energy dissipation. In the actual state of knowledge fatigue crack propagation is modeled using crack closure concept. The fatigue crack growth behavior under constant amplitude and variable amplitude loading of the aluminum alloy 2024 T351 are analyzed using in terms energy parameters. In the case of VAL (variable amplitude loading) tests, the evolution of the hysteretic energy dissipated per block is shown similar with that observed under constant amplitude loading. A linear relationship between the crack growth rate and the hysteretic energy dissipated per block is obtained at high growth rates. For lower growth rates values, the relationship between crack growth rate and hysteretic energy dissipated per block can be represented by a power law. In this paper, an analysis of fatigue crack propagation under variable amplitude loading based on energetic approach is proposed.
ISSN:1335-0803
1338-6174