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Unformatted text preview: AERSP 301 Structural Idealization Jose Palacios October 2009 Combined C/S’s Combined C/S’s • We looked at open and closed sections separately. • For combined open and closed sections we can use everything we learned so far, with one exception. – Bending – the direct stress calculations and bending deflections do not depend on the c/s type – Shear – solve problems in the same manner. • Shear diagram – Torsion – torisonal stiffness for closed c/s is much greater than that of an open c/s, therefore we can ignore the open c/s in the calculation of torsional stiffness. Structural Idealization Structural Idealization • Consider the twospar wing section shown. The stringers and spar carry most of the direct stresses while the skin carries the shear stresses. • Since variation in stress over the stringer or spar flange due to bending of the wing would be small, it can be assumed to be constant. Structural Idealization Structural Idealization • Stingers and spar flanges can then be replaced by concentrations of areas known as booms. • It can be assumed that all direct stresses are carried by booms and the skin carries only shear. • Direct stress carrying capacity of the skin may be accounted for by increasing the boom crosssection area. Structural Idealization Structural Idealization • If skin does carry direct stress, we idealize it as a section that carries only shear stress, and add effective area to the booms....
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 '09
 GANDHI,FARHANLESIEUTRE,GEORGE
 Force, Shear Stress, Shear flow, C/S Sample Problem, Br Shear

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