
Accession Number : AD0669836
Title : RESEARCH ON ENERGY ABSORBING STRUCTURES. PART VI.
Descriptive Note : Final rept. 1 Feb 6731 Jan 68,
Corporate Author : ARA INC WEST COVINA CALIF
Personal Author(s) : Mazelsky,Bernard ; Lin,T. H. ; Lin,ShengRong
Report Date : MAR 1968
Pagination or Media Count : 72
Abstract : An analytical method for predicting very large deflections of flat rectangular plates subjected to nonsymmetric loads, with respect to the centerline of the flat plate, has been developed and correlated with experiment. For deflections below twenty percent of the plate's length and/or width, the theory of Mansfield and Kleeman's could be used. For large deflections and loading conditions, their theory is inapplicable due to the change in moment arm caused by the plate's deflection. The present theory properly accounts for the moment arm correction for plate deflections up to sixty percent of its length and/or 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 A1100 and 2024 T3 were measured. The 2024 aluminum has 4 to 5 times the energy absorption capability of the A1100 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. (Author)
Descriptors : (*TRAFFIC, SAFETY), (*ROADS, STRUCTURES), (*METAL PLATES, DEFLECTION), TEST METHODS, BERYLLIUM ALLOYS, ALUMINUM ALLOYS, LOADS(FORCES), MATHEMATICAL ANALYSIS, THEORY, FATIGUE(MECHANICS), TORSION
Subject Categories : Metallurgy and Metallography
Civil Engineering
Structural Engineering and Building Technology
Mechanics
Distribution Statement : APPROVED FOR PUBLIC RELEASE