NDLI: Least-work analysis of the problem of shear lag in box beams

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Least-work analysis of the problem of shear lag in box beams

Content Provider	NASA Technical Reports Server (NTRS)
Copyright Year	1943
Description	The distribution of stress in the cover sheets of thin-wall box beams is analyzed, with regard to the effect of shear deformation in the cover sheets, by the method of least work. Explicit results are obtained for a number of representative cases that show the influence of the following factors on the stress patterns. (1) Variation of stress in spanwise direction as given by elementary beam theory. (2) Value of a parameter called shear-lag aspect ratio which designates the product of span-width ratio of the beam and of the square root of the ratio of effective shear modulus and tensing modulus of the cover sheets. (3) Value of ratio of cover-sheet stiffness to side-web stiffness. (4) Variation of beam height in span direction. (5) Variation of beam width in span direction. (6) Variation of cover-sheet thickness in span direction. General conclusions are drawn from the results obtained. Among them the most important one appears to be the fact that the shear-lag effect depends primarily on the following tow quantities: (1) the value of the shear-lag aspect ratio. (2) the shape of the curve representing the product of the stress of elementary beam theory and of the cover-sheet thickness.
File Size	4195535
Page Count	127
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19930084899
Archival Resource Key	ark:/13960/t1gj2q72g
Language	English
Publisher Date	1943-01-01
Access Restriction	Open
Subject Keyword	Stress Calculations, Least-work Stressed Skin-beams, Box Beams-bending Beams, Tapered-shear Beams, Cantilever Beams, Thin-stresses Beams, Box-shear Lag Theories-beams Diagrams, Stress Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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