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Impact Buckling of Thin Bars in the Elastic Range Hinged at Both Ends

Description: "Following the development of the well-known differential equations of the problem and their resolution for failure in tension, the bending (transverse) oscillations of an originally not quite straight bar hinged at both ends and subjected to a constant longitudinal force (shock load) are analyzed. To this end the course of the bar form is expanded in a sinusoidal series, after which the investigation is carried through separately for the fundamental oscillation and the (n-1)the higher oscillations. The analysis of the fundamental oscillation distinguishes three cases: shock load lower, equal to, or higher than the Eulerian load" (p. 1).
Date: June 1934
Creator: Koning, Carel & Taub, Josef
Partner: UNT Libraries Government Documents Department

Interaction of Column and Local Buckling in Compression Members

Description: Note presenting two methods for calculating actual buckling stress, including the author's exact theory and the method of split rigidities, both of which lead almost identical results. Columns with box-, I-, H-, and T-sections and angles are considered separately.
Date: March 1952
Creator: Bijlaard, P. P. & Fisher, G. P.
Partner: UNT Libraries Government Documents Department

Compressive and Torsional Buckling of Thin-Wall Cylinders in Yield Region

Description: Note presenting a general set of equilibrium differential equations for the plastic buckling of cylinders, which are based on assumptions that have led to the best agreement between theory and test data on inelastic buckling of flat plates. Test data are presented which indicate satisfactory agreement with the theoretical plasticity-reduction factors in most cases. Some of the topics addressed include compressive buckling and torsional buckling.
Date: August 1956
Creator: Gerard, George
Partner: UNT Libraries Government Documents Department

Buckling of Long Square Tubes in Combined Compression and Torsion and Comparison with Flat-Plate Buckling Theories

Description: Note presenting the results of buckling tests of long square tubes loaded in compression, torsion, and combined compression and torsion and a comparison with theoretical compression and shear buckling curves and with theoretical interaction curves for the buckling of simply supported flat plates. Results regarding the pure compression and pure torsion buckling and combined compression and torsion buckling are provided.
Date: May 1954
Creator: Peters, Roger W.
Partner: UNT Libraries Government Documents Department

Bending and buckling of rectangular sandwich plates

Description: "Differential equations and boundary conditions are derived for the bending and buckling of sandwich plates. The buckling load is calculated for a simply supported plate subjected to edgewise compression. The formulas are evaluated numerically and the results are plotted in a diagram" (p. 1).
Date: November 1950
Creator: Hoff, N. J.
Partner: UNT Libraries Government Documents Department

Stresses in and general instability of monocoque cylinders with cutouts 6: calculation of the buckling load of cylinders with side cutout subjected to pure bending

Description: Report presenting a strain-energy theory for the calculation of the buckling load in general instability of circular reinforced monocoque cylinders with a side cutout and subjected to pure bending.
Date: March 1948
Creator: Hoff, N. J.; Klein, Bertram & Boley, Bruno A.
Partner: UNT Libraries Government Documents Department

A small-deflection theory for curved sandwich plates

Description: A small-deflection theory that takes into account deformations due to transverse shear is presented for the elastic-behavior analysis of orthotropic plates of constant cylindrical curvature, with consideration of buckling included. The theory is applicable primarily to sandwich construction. (author).
Date: 1951
Creator: Stein, Manuel & Mayers, J.
Partner: UNT Libraries Government Documents Department

Compressive buckling of simply supported curved plates and cylinders of sandwich construction

Description: From Summary: "Theoretical solutions are presented for the buckling in uniform axial compression of two types of simply supported curved sandwich plates: the corrugated-core type and the isotropic-core type. The solutions are obtained from a theory for orthotropic curved plates in which deflections due to shear are taken into account. Results are given in the form of equations and curves."
Date: January 1952
Creator: Stein, Manuel & Mayers, J.
Partner: UNT Libraries Government Documents Department

A small-deflection theory for curved sandwich plates

Description: From Summary: "A small-deflection theory that takes into account deformations due to transverse shear is presented for the elastic-behavior analysis of orthotropic plates of constant cylindrical curvature, with considerations of buckling included. The theory is applicable primarily to sandwich construction."
Date: February 1950
Creator: Stein, Manuel & Mayers, J.
Partner: UNT Libraries Government Documents Department

Plastic buckling of a long flat plate under combined shear and longitudinal compression

Description: Report presenting the condition for plastic buckling of a long flat plate under combined shear and longitudinal compression is obtained by using the theory of plastic buckling developed for simple loading, provided the ratio of shear to longitudinal compression is assumed constant during the loading process. A detailed calculation for a number of simply supported plates made of a typical aluminum alloy shows that an approximate algebraic relationship provided in the paper will suffice for determination of buckling stress.
Date: December 1949
Creator: Stowell, Elbridge Z.
Partner: UNT Libraries Government Documents Department

Plastic buckling of extruded composite sections in compression

Description: From Summary: "The theory of plastic buckling, originally derived for individual plates, has been extended to apply to combinations of plates such as H- and Z-sections. The theory has been applied specifically to extruded H-sections of 75S-T6 aluminum alloy; the calculated buckling stresses agree satisfactorily with the stresses obtained experimentally."
Date: October 1949
Creator: Stowell, Elbridge Z. & Pride, Richard A.
Partner: UNT Libraries Government Documents Department

A unified theory of plastic buckling of columns and plates

Description: On the basis of modern plasticity considerations, a unified theory of plastic buckling applicable to both columns and plates has been developed. For uniform compression, the theory shows that long columns which bend without appreciable twisting require the tangent modulus and that long flanges which twist without appreciable bending require the secant modulus. Structures that both bend and twist when they buckle require a modulus which is a combination of the secant modulus and the tangent modulus.
Date: July 29, 1947
Creator: Stowell, Elbridge Z.
Partner: UNT Libraries Government Documents Department

A unified theory of plastic buckling of columns and plates

Description: From Summary: "On the basis of modern plasticity considerations, a unified theory of plastic buckling applicable to both columns and plates has been developed. For uniform compression, the theory shows that long columns which bend without appreciable twisting require the tangent modulus and that long flanges which twist without appreciable bending require the secant modulus. Structures that both bend and twist when they buckle require a modulus which is a combination of the secant modulus and the tangent modulus."
Date: April 1948
Creator: Stowell, Elbridge Z.
Partner: UNT Libraries Government Documents Department

Elastic and plastic buckling of simply supported solid-core sandwich plates in compression

Description: From Summary: "A solution is presented for the problem of the compressive buckling of simply supported, flat, rectangular, solid-core sandwich plates stressed either in the elastic range or in the plastic range. Charts for the analysis of long sandwich plates are presented for plates having face materials of 24S-T3 aluminum alloy, 76S-T6 Alclad aluminum alloy, and stainless steel. A comparison of computed and experimental buckling stresses of square solid-core sandwich plates indicates fair agreement between theory and experiment."
Date: 1950
Creator: Seide, Paul & Stowell, Elbridge Z.
Partner: UNT Libraries Government Documents Department

Elastic and plastic buckling of simply supported metalite type sandwich plates in compression

Description: Report presenting a solution for the problem of the compressive buckling of simply supported, flat, rectangular, Metalite type sandwich plates stressed either in the elastic or plastic range. Charts for the analysis of long sandwich plates are provided for plates with face materials of 24S-T3 aluminum alloy, 75S-T6 Alclad aluminum alloy, and stainless steel.
Date: February 1949
Creator: Seide, Paul & Stowell, Elbridge Z.
Partner: UNT Libraries Government Documents Department

Critical stress of plate columns

Description: Report presenting solutions for the elastic buckling stress of flat rectangular plates with simply supported or fixed ends when loaded as columns. The procedure for determining the critical stress of plate columns with intermediate end fixities is also given.
Date: August 1950
Creator: Houbolt, John C. & Stowell, Elbridge Z.
Partner: UNT Libraries Government Documents Department

Stresses in and general instability of monocoque cylinders with cutouts 8: calculation of the buckling load of cylinders with long symmetric cutout subjected to pure bending

Description: Report presenting a strain-energy theory established for the calculation of the buckling load in pure bending of reinforced monocoque cylinders which have a symmetric cutout on the compression side and buckle according to general-instability patterns. The difference between this theory and other theories is the use of the axial wave length as an additional parameter whose value was determined from a minimum condition.
Date: October 1949
Creator: Hoff, N. J.; Boley, Bruno A. & Mandel, Merven W.
Partner: UNT Libraries Government Documents Department

Thermal buckling of plates

Description: "An approximate method, based on large-deflection plate theory, for calculating the deflections of flat or initially imperfect plate subject to thermal buckling is outlined. The method is used to determine the deflections of a simply supported panel subjected to a tentlike temperature distribution over the plate surface. Experimental results for a particular panel are in good agreement with the theoretical results for the range of temperatures and deflections considered in the test" (p. 1).
Date: August 1952
Creator: Gossard, Myron L.; Seide, Paul & Roberts, William M.
Partner: UNT Libraries Government Documents Department

Plastic buckling of simply supported compressed plates

Description: Report presenting an investigation to ascertain the validity of various theories for the plastic buckling of compressed simply supported plates by means of local-instability tests of drawn square tubes of 14S-T6 aluminum alloy. The results obtained were in excellent agreement with Stowell's unified theory for the plastic buckling of columns and plates.
Date: April 1949
Creator: Pride, Richard A. & Heimerl, George J.
Partner: UNT Libraries Government Documents Department

Some Research Results on Sandwich Structures

Description: "The results of compressive-buckling tests of steel sandwich plates are given, and the significant parameters which affect the strength of the plates are discussed. The various types of sandwich construction are shown to be comparable on a weight-strength basis with conventional high-strength aluminum-alloy construction" (p. 1).
Date: June 1957
Creator: Anderson, Melvin S. & Updegraff, Richard G.
Partner: UNT Libraries Government Documents Department

The Effect of Initial Displacement of the Center Support on the Buckling of a Column Continuous Over Three Supports

Description: Report presenting an investigation of a long column continuous over three supports to determine its critical load when the center support was given varying amounts of initial displacement. During each test, the middle support was hinged so as to be free to move parallel to the column axis during buckling. The critical loads predicted from load-deflection readings were different for the upper and lower spans.
Date: November 1940
Creator: Lundquist, Eugene E. & Kotanchik, Joseph N.
Partner: UNT Libraries Government Documents Department

Analysis of Square Shear Web Above Buckling Load

Description: "A solution of Von Karman's fundamental equations for plates with large deflections is presented for the case of a shear web divided into square panels by reinforcing struts. Numerical solutions are given for struts of infinite rigidity and for struts the weight of which is one-fourth the weight of the sheet. The results are compared with Wagner's diagonal tension theory as extended by Kuhn and by Langhaar. It is found that the diagonal tension theory as developed by Kuhn agrees best with the present paper in the practical range when r=1/4. Kuhn's theory is in especially good agreement for the force in the strut when r=1/4" (p. 1).
Date: July 1944
Creator: Levy, Samuel; Fienup, Kenneth L. & Woolley, Ruth M.
Partner: UNT Libraries Government Documents Department