Evolution of voids during ductile crack propagation in an aluminium alloy sheet toughness test studied by synchrotron radiation computed tomography
Morgeneyer, T.F., Starink, M.J. and Sinclair, I. (2008) Evolution of voids during ductile crack propagation in an aluminium alloy sheet toughness test studied by synchrotron radiation computed tomography. Acta Materialia, 56, 1671-1679. (doi:10.1016/j.actamat.2007.12.019).
The anisotropy of fracture toughness in AA2139 (Al-Cu-Mg) alloy sheet has been investigated via synchrotron radiation computed tomography of arrested cracks in Kahn tear test pieces for different loading cases. The three dimensional distribution and morphology of pores and defects in the as-received state are seen to be anisotropic, with chains of voids and void elongation in the L (longitudinal) direction. For toughness testing in L-T orientation (T is transverse), voids ahead of the crack grow and link in the L direction. In T-L tests, voids ahead of the crack tip also grow in the loading direction, although a high degree of alignment is retained in the L direction. The present work provides quantitative microstructural data that can be used as input for and validation of recent idealised model formulations, and it is shown that the measured void dimensions and evolution are consistent with measured toughness anisotropy.
|Additional Information:||Acknowledgements: The authors would like to acknowledge Alcan CRV for financial support and material supply, Frédéric Bron and Bernard Bès for technical discussion Jean-Yves Buffière for support in SRCT imaging and the assistance of Elodie Boller in the use of the beamline at the ESRF.|
|Keywords:||aluminium, 2139, Al-Cu-Mg, Al-Cu-Mg-Ag, void, crack growth, toughness, grain boundary, coalescence, toughness, Kahn test, tear test, aerospace alloy, creep froming, age forming, wing, fuselage, damage tolerance, anisotropy|
|Subjects:||T Technology > TL Motor vehicles. Aeronautics. Astronautics
T Technology > TN Mining engineering. Metallurgy
|Divisions:||University Structure - Pre August 2011 > School of Engineering Sciences > Engineering Materials & Surface Engineering
|Date Deposited:||17 Jan 2008|
|Last Modified:||05 Feb 2015 14:48|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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