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[i]One test undertaken studied thermal effects on sheets of large titanium... When a 4ft X 6ft element was heated... it resulted in the sample warping into a totally unacceptable shape. This problem was resolved by manufacturing chordwise corrugations into the wing outer skins. At the design heat rate the corrugations merely deepened by a few thousandths of an inch and on cooling returned to their original shape.[/i]
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