Multi-approach study of crack-tip mechanics on aluminium 2024 alloy

•Study of crack-tip propagation with macro-scale and micro-scale analyses.•Experimental estimation of the crack-tip position and the crack orientation.•Macro-scale analysis includes estimation of the SIF (continuum mechanics) from DIC.•Micro-scale investigation includes fractography analysis with SE...

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Veröffentlicht in:Theoretical and applied fracture mechanics 2018-12, Vol.98, p.38-47
Hauptverfasser: Chernyatin, A.S., Lopez-Crespo, P., Moreno, B., Matvienko, Yu.G.
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container_issue
container_start_page 38
container_title Theoretical and applied fracture mechanics
container_volume 98
creator Chernyatin, A.S.
Lopez-Crespo, P.
Moreno, B.
Matvienko, Yu.G.
description •Study of crack-tip propagation with macro-scale and micro-scale analyses.•Experimental estimation of the crack-tip position and the crack orientation.•Macro-scale analysis includes estimation of the SIF (continuum mechanics) from DIC.•Micro-scale investigation includes fractography analysis with SEM.•Full-field displacement information is combined with Williams’ series development. This work presents a comprehensive study for characterising the crack-tip mechanics and fatigue crack propagation in an Aluminium 2024-T351 alloy. It combines information obtained from three different sources: full-field displacement information from digital image correlation, analytical modelling of the crack-tip field and SEM fractographies. The displacement data measured around the crack-tip are fitted to a Williams’ series development in order to evaluate singular and non-singular terms of the crack-tip field. The procedures also allows rigid body motion to be corrected and the crack-tip coordinates and crack orientation to be estimated. Fatigue striations from the fracture surface were analysed with SEM in order to estimate the crack growth rate for different boundary conditions. Representation of all the results together with the Paris law data of the alloy allows the procedures to be cross-validated and to fit with a good agreement micro-scale measurements with continuum mechanics estimations.
doi_str_mv 10.1016/j.tafmec.2018.09.007
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subjects Al 2024-T351
Aluminum
Aluminum alloys
Boundary conditions
Continuum mechanics
Correlation analysis
Crack propagation
Crack tips
Cracks
Digital image correlation
Digital imaging
Fatigue crack growth
Fatigue failure
Fracture mechanics
Fracture surfaces
Materials fatigue
Rigid structures
Rigid-body dynamics
Scanning electron microscope
Scanning electron microscopy
Stress intensity factor
Stress intensity factors
Striations
title Multi-approach study of crack-tip mechanics on aluminium 2024 alloy
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