RESEARCH ON ENERGY ABSORBING STRUCTURES, PART VI
Technical Report,01 Feb 1967,31 Jan 1968
ARA INC WEST COVINA CA WEST COVINA
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An analytical method for predicting very large deflections of flat rectangular plates subjected to non-symmetric loads, with respect to the centerline of the flat plate, has been developed and correlated with experiment. For deflections below twenty percent of the plates length andor width, the theory of Mansfield and Kleemans could be used. For large deflections and loading conditions, their theory is inapplicable due to the change in moment arm caused by the plates deflection. The present theory properly accounts for the moment arm correction for plate deflections up to sixty percent of its length andor width. An extensive experimental study was made on low cycle fatigue of thin walled specimens. The total energy absorbed in cyclic torsion for two types of aluminum A-1100 and 2024 T-3 were measured. The 2024 aluminum has 4 to 5 times the energy absorption capability of the A-1100 aluminum. Axial compressive stress on cyclic torsion of beryllium copper increased the total energy absorption 3 to 4 times as that when no compressive axial stress was applied. The large deflection theory was applied to the successful design and manufacture of an energy absorbing highway protective barrier system for the Department of Transportation.