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Local instability of symmetrical rectangular tubes under axial compressionA chart is presented for the coefficient in the formula for the critical compressive stress at which cross sectional distortion begins in a thin-wall tube of rectangular section symmetrical about its two principal axes. The energy method of Timoshenko was used in the theoretical calculations required for the construction of the chart. The deflection equation used in this method was selected to give good accuracy. The exact values given by solution of the differential equation were calculated for a number of cases and it was found that the energy solution was correct to within a fraction of 1 percent. The calculation of the critical compressive stress at stresses above the elastic range is also discussed. In order to demonstrate the use of the formulas and the chart in engineering calculations, several illustrative problems are included.
Document ID
19930081510
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Lundquist, Eugene E
Date Acquired
September 6, 2013
Publication Date
February 1, 1939
Report/Patent Number
NACA-TN-686
Accession Number
93R10800
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Keywords
TUBING, RECTANGULAR - STRESSES, COMPRESSIVE
THEORIES - BUCKLING -TIMOSHENKO
PLATES - BUCKLING
STRESSED SKIN
CHARTS - STRESSES

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