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The subject of this paper is the buckling behavior of thin bar stiffeners attached to plates which are subjected to normal pressure loadings. The stiffeners are mathematically modeled by a nonlinear beam theory recently derived. An analytical solution is obtained to the beam buckling equations. The curvature of the centerline along the beam's base at the buckling load is expressed in terms of the beam's thickness, height, and rotational stiffness. Analytical results are compared with an experiment recently performed.
Experimental studies on the tripping behavior of narrow T-stiffened flat plates subjected to hydrostatic pressure and underwater shock
An experimental investigation was conducted to determine the static and dynamic responses of a specific stiffened flat plate design. The air-backed rectangular flat plates of 6061-T6 aluminum with an externally machined longitudinal narrow-flanged T-stiffener and clamped boundary conditions were subjected to static loading by water hydropump pressure and shock loading from an eight pound TNT charge detonated underwater. The dynamic test plate was instrumented to measure transient strains and free field pressure. The static test plate was instrumented to measure transient strains, plate deflection, and pressure. Emphasis was placed upon forcing static and dynamic stiffener tripping, obtaining relevant strain and pressure data, and studying the associated plate-stiffener behavior.
Buckling strength of metal structures
BUCKLING STRENGTH OF METAL STRUCTURES. Friedrich Bleich. McGraw-Hill, New York, 1952. 508 pp. 263 figures. £4 5s. Od. net. In the opinion of the reviewer, this book is the most important to be written about elastic stability since the publication—also as an Engineering Societies Monograph —of Timoshenko's classic work Theory of Elastic Stability. It is lucidly written, beautifully produced, and approaches the subject from the essentially practical standpoint of the practising engineer. As the work was sponsored by the Bureau of Shops of the U.S. Navy Department, it has been written with the needs of naval architects and engineers primarily in mind. But the value of the book is by no means limited to these two special groups of people, as much of the contents is relevant to nearly all branches of structural engineering, including in particular that of aircraft structures. Two features which deserve special mention are the following. First, the care with which different theories are compared and contrasted, and the thoroughness with which the basic assumptions and their range of validity are examined and explained. Second, the amount of attention paid to what happens outside the purely elastic range. From the standpoint of the aeronautical structural engineer, Buckling Strength of Metal Structures provides a comprehensive treatment of the stability problems associated with columns and flat sheets, but does not cover in sufficient detail either the stability of curved sheets (considered as isolated components), or the stability of sheetstringer combinations. It is fair to say that for the special purpose for which it was written, i.e. for designers and engineers engaged in naval construction, Dr. Bleich's book is admirable; for those whose interests lie in other branches of structural engineering it is well worth having.—D. M. A. LEGGETT.