Method of producing minimum weight thin wall profile members
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United States of America Patent
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Jun 11, 2013
Grant Date -
Aug 23, 2012
app pub date -
Oct 31, 2011
filing date -
Dec 1, 2000
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Abstract
A minimum weight thin wall profile member is produced by selecting range values of cross section dimensions ratios for the thin wall profile member and various ratio values within the range values, and determining shape efficiency factor values Σ1, Σ2 . . . Σn based on the selected ratio values within the range values. Each shape efficiency factor value is determined using the expression Σ=Kf·Km, where Kf=(i2/F)2/5 is an overall stability factor, Km=K1/5/(b/δb)2/5 is a local stability factor, b, δb are the width and the thickness, respectively, of the main strip, i and F are the radius of gyration and the area of the cross-section, respectively, and K is the local stability stress coefficient. A maximum shape efficiency factor value Σmax is selected from the determined shape efficiency factor values, and the corresponding ratio values are used to produce the minimum weight thin wall profile member.
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