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Your search keyword '"Gourlay, C.M."' showing total 45 results
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45 results on '"Gourlay, C.M."'

31. Semi-solid deformation of Al-Cu alloys: a quantitative comparison between real-time imaging and coupled LBM-DEM simulations

Author

Su, T.C., O'Sullivan, C., Nagira, T., Yasuda, H., Gourlay, C.M., and Engineering & Physical Science Research Council (EPSRC)

Subjects
Technology, Science & Technology, Synchrotron radiation, Materials Science, Dilatancy, 0204 Condensed Matter Physics, Materials Science, Multidisciplinary, MECHANICAL-BEHAVIOR, RHEOLOGICAL BEHAVIOR, DISTINCT ELEMENT METHOD, Image analysis, Discrete element method, HOT TEARING FORMATION, SHEAR BEHAVIOR, LATTICE-BOLTZMANN METHOD, ALUMINUM-COPPER ALLOYS, Metallurgy & Metallurgical Engineering, Semi-solid, IN-SITU OBSERVATION, MG-AL, PARTICLE, 0912 Materials Engineering, Materials, 0913 Mechanical Engineering
Abstract

Semi-solid alloys are deformed in a wide range of casting processes; an improved understanding and modelling capability is required to minimise defect formation and optimise productivity. Here we combine thin-sample in-situ X-ray radiography of semisolid Al-Cu alloy deformation at 40–70% solid with 2D coupled lattice Boltzmann method - discrete element method (LBM-DEM) simulations. The simulations quantitatively capture the key features of the in-situ experiments, including (i) the local contraction and dilation of the grain assembly during shear deformation; (ii) the heterogeneous strain fields and localisation features; (iii) increases in local liquid pressure in regions where liquid was expelled from the free surface in the experiment; and (iv) decreases in liquid pressure in regions where surface menisci are sucked-in in experiments. The verified DEM simulations provide new insights into the role of initial solid fraction on the stress-deformation response and support the hypothesis that the behaviour of semi-solid alloys can be described using critical state soil mechanics.

Published
2018

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