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- W1582235648 abstract "Some aluminum ingots cast by the direct chill method are subject to surface defects on the molten ingot head during casting while others are not. These defects -commonly called “vertical folds” -are frozen into the casting and must be removed prior to rolling. Vertical folds are found on top of the molten ingot surface where areas of thin oxide are (a) bounded by physical constraints and (b) stretched. Physical constraints include (1) substantially thicker oxide or (2) a refractory skim ring adjacent to the thin oxide. The mechanism of wrinkling is suggested for the formation of vertical folds. Wrinkling behavior is described by physical expressions for an elastic sheet in tension whose behavior depends upon thickness h, length L, Young’s modulus E, and Poisson’s ratio v. The depth and frequency of folds in the thin, elastic sheet parallel to the tensile axis between the two “constraints” can be calculated from these parameters. The observed frequency (and amplitude) of vertical folds in DC-cast aluminum has been found to obey similar wrinkling laws. The frequency-dependence (λ) is examined and found to be related to classic wrinkling parameters but with significant scaling deviations. These deviations may be related to the pseudo-plasticity (self-healing behavior) of the oxide film on the molten surface. A wrinkling model coupled with pseudo-plasticity predicts subtle behaviors in DC casting of Al-Mg4.5 that are not explained by other theories." @default.
- W1582235648 created "2016-06-24" @default.
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- W1582235648 date "2016-01-01" @default.
- W1582235648 modified "2023-09-23" @default.
- W1582235648 title "Wrinkling Phenomena to Explain Vertical Fold Defects in DC-Cast Al-Mg4.5" @default.
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- W1582235648 doi "https://doi.org/10.1007/978-3-319-48228-6_99" @default.
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