Treating pressure vessels
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United States of America Patent
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Dec 10, 2002
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N/A
app pub date -
Jul 29, 1997
filing date -
Oct 13, 1994
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Abstract
A pressure vessel has a cylindrical side wall and a closed end joined to the side wall at a knuckle. The fatigue resistance of the pressure vessel is improved by autofrettage which moves a region of peak stress from the internal surface of the vessel to a region within the knuckle. Preferred are pressurized gas vessels of 6000 or 7000 series aluminum alloys.
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