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2018•Academic Perspective ProcediaOpen access

Variation in Crack Growth Properties and Its Effect on Fatigue Crack Growth Life for Al 7075-T6

Mehmet F. Yaren, Ali O. Ayhan

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Abstract

In this study, two different 3D crack propagation analyses are performed for Al 7075-T6. Each analysis has different crack growth constants (C-n) which are obtained by separate tests. The steps of crack growth analysis by using Fracture and Crack Propagation Analysis System (FCPAS) are detailed. As a result of crack growth analyses, stress intensity factor (SIF) distributions, growing crack fronts and crack growth lives are plotted and compared with the results of another study in the literature. The obtained results are in agreement with the literature data. Variation crack growth material properties and its effect on fatigue crack growth life is investigated. As a result, it has been shown that for the cases with the same stress intensity factor value, the variation crack growth material properties significantly change the crack growth life.

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In this study, two different 3D crack propagation analyses are performed for Al 7075-T6. Each analysis has different crack growth constants (C-n) which are obtained by separate tests. The steps of crack growth analysis by using Fracture and Crack Propagation Analysis System (FCPAS) are detailed. As a result of crack growth analyses, stress intensity factor (SIF) distributions, growing crack fronts and crack growth lives are plotted and compared with the results of another study in the literature. The obtained results are in agreement with the literature data. Variation crack growth material properties and its effect on fatigue crack growth life is investigated. As a result, it has been shown that for the cases with the same stress intensity factor value, the variation crack growth material properties significantly change the crack growth life.

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Available abstract

In this study, two different 3D crack propagation analyses are performed for Al 7075-T6. Each analysis has different crack growth constants (C-n) which are obtained by separate tests. The steps of crack growth analysis by using Fracture and Crack Propagation Analysis System (FCPAS) are detailed. As a result of crack growth analyses, stress intensity factor (SIF) distributions, growing crack fronts and crack growth lives are plotted and compared with the results of another study in the literature. The obtained results are in agreement with the literature data. Variation crack growth material properties and its effect on fatigue crack growth life is investigated. As a result, it has been shown that for the cases with the same stress intensity factor value, the variation crack growth material properties significantly change the crack growth life.

Key concepts: Crack closure, Crack growth resistance curve, Materials science, Stress intensity factor, Paris' law, Fracture mechanics, Composite material, Structural engineering

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