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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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            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

                Journal
                Frattura ed Integrità Strutturale
                Gruppo Italiano Frattura
                01 June 2017
                : 11
                : 41
                Article
                a7efd34308d14f048707d20c7c1ccfdb
                10.3221/IGF-ESIS.41.05
                d2fa0e78-7a40-437a-985b-df69771ae814

                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/

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

                Materials technology,Materials properties,Materials characterization,Engineering,Civil engineering,Mechanical engineering
                Surface crack,Aluminum alloys,Crack growth,Environmental conditions,Fatigue fracture diagram,Plastic SIF

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