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      Effect of different environmental conditions on surface crack growth in aluminum alloys

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          Abstract

          . Fatigue surface crack growth is studied through experiments and computations for aluminum alloys D16T and B95AT (analogue of 2024 and 7075 aluminum). Subjects for studies are cylindrical hollow specimens with external semi-elliptical surface crack. The variation of fatigue crack growth rate and surface crack paths behavior was studied under cyclic loading for different environmental conditions. Uniaxial tension tests were carried out at low (-60°C), room (+23°C) and high (+250°C) temperature. For the same specimen configuration and the different crack front position as a function of cyclic loading and temperatures conditions the distributions of governing parameter of the elastic-plastic stress fields in the form of In-factor along various crack fronts was determined from numerical calculations. This governing parameter was used as the foundation of the elastic-plastic stress intensity factor (SIF). Both elastic and plastic SIF approach was applied to the fatigue crack growth rate interpretation. It is found that there is a steady relationship between the crack growth rate and the plastic SIF in the form of general curve within a relatively narrow scatter band for all tested specimens at different temperatures.

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          Characterization of crack tip stress fields in test specimens using mode mixity parameters

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            • Record: found
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            Fatigue Surface Crack Growth in Aluminum Alloys under Different Temperatures

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              Surface flaws behavior under tension, bending and biaxial cyclic loading

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                Author and article information

                Affiliations
                [1 ] Kazan Scientific Center of the Russian Academy of Sciences, Russia
                [2 ] Kazan Scientific Center of the Russian Academy of Sciences, Russia
                Journal
                Frattura ed Integrità Strutturale
                Gruppo Italiano Frattura
                01 July 2017
                : 11
                : 41
                : 31-39
                da0bdc757b7f4d6d860388ccb7d7b36f 10.3221/IGF-ESIS.41.05

                This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

                Categories
                Mechanical engineering and machinery
                TJ1-1570
                Structural engineering (General)
                TA630-695

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