STABILIZATION OF HIGH ASPECT RATIO BEAMS DURING BENDING FOR USE AS SHIP FRAMES. PART III

During the plastic bending of high aspect ratio beams, typically encountered in ship frames, the edge of the beam on the inside of the curvature is subjected to compressive stress above the yield point. If this is a free edge, as for angle or rectangular cross sections, the web is subjected to a potential buckling situation. Flanges are subject to similar instability. This report deals with potential solutions to these problems. Experimental work was carried out with small scale beams to determine characteristics of the buckling phenomenon in beam webs and the magnitude of force required to constrain beam webs to prevent buckling. A theoretical approach to plastic buckling is advanced and used to extrapolate the requirements for stabilizing full size ship frames. Two stabilization systems were designed, constructed, and tested in a model beam bender developed in earlier work. These are evaluated for potential use in a commercial bending machine.

• Corporate Authors:

  Case Western Reserve University

  School of Engineering
  10900 Euclid Avenue
  Cleveland, OH  United States  44106

  National Science Foundation

  Applied Science and Research Applications, 1800 G Street, NW
  Washington, DC  United States  20550
• Authors:
  • Mergler, H W
  • Wright, DKJ
• Publication Date: 1976-9

Media Info

• Pagination: 144 p.

Subject/Index Terms

• TRT Terms: Beams; Bending; Bending moments; Buckling; Cold working; Computer programs; Frames; Hulls; Metal working; Plastic analysis; Ratios; Shipbuilding; Soil stabilization; Steel structures; Structural analysis; Structural steel
• Uncontrolled Terms: Aspect ratio; Ship hulls
• Old TRIS Terms: Beams (Structural); Computer programs (Structural analysis); Frame bending; Frame bending machines; Hull bending moments; Metal bending; Stabilization systems
• Subject Areas: Geotechnology; Marine Transportation; Materials;

Filing Info

• Accession Number: 00190765
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: NSF/RA-761596
• Contract Numbers: NSF-GI-35994
• Files: TRIS
• Created Date: Mar 28 1979 12:00AM