USE OF NON-CONFORMING MODES IN FINITE ELEMENT ANALYSIS OF PLATES AND SHELLS

The development of yet another finite element is presented in this study. By adding nonconforming displacement modes selectively to the low order isoparametric elements, highly improved new shell elements are established. Addition of various combinations of nonconforming modes to the original elements has been investigated and the elements, both linear and quadratic, which have two nonconforming modes added to the inplane displacements, four to the out-of-plane displacement and no additional modes to rotations have been found to be most effective in terms of the number of nonconforming modes used versus the improvement obtained. These elements have been tested with deep beam, plate, and various shell problems. Cylindrical, elliptic paraboloid, spherical and conoidal shells were investigated in order to demonstrate the versatility of newly developed nonconforming elements. The results obtained from these investigations compare favorably with the results from well-established analyses. The improvement incorporated into the four-node element is most impressive.

• Supplemental Notes:
  • Civil Engineering Studies, Structural Research Series #401.
• Corporate Authors:

  University of Illinois, Urbana-Champaign

  Department of Civil and Environmental Engineering
  205 North Mathews Avenue
  Urbana, IL  United States  61801-2352
• Authors:
  • Choi, C K
  • Schnobrich, W C
• Publication Date: 1973-9

Media Info

• Features: Appendices; References;
• Pagination: 114 p.

Subject/Index Terms

• TRT Terms: Cylinders (Geometry); Deflection; Finite element method; Shells (Structural forms); Structural plates
• Uncontrolled Terms: Cylindrical shells
• Old TRIS Terms: Plate deflections; Shell theory; Spherical shells
• Subject Areas: Marine Transportation; Materials;

Filing Info

• Accession Number: 00050702
• Record Type: Publication
• Source Agency: Ship Structure Committee
• Report/Paper Numbers: UILU-ENG-73-2019
• Contract Numbers: N00014-67A-0305-0010
• Files: TRIS
• Created Date: Jan 24 1974 12:00AM