SLADE: A COMPUTER PROGRAM FOR THE STATIC ANALYSIS OF THIN SHELLS

Presented is a finite element method FORTRAN program designed for the static analysis of thin shells. A doubly curved, arbitrary quadrilateral element is utilized. The element is based on a minimum potential energy principle for thin shells. Since the majority of aerospace structures are based on shells of revolution, the program is designed specifically for a shell the reference surface of which is a portion of an axisymmetric surface. The program allows up to five separate layers and up to five separate elastic anisotropic materials with temperature-dependent properties. The program handles variable thickness shells and allows thickness discontinuities along element boundaries. It provides for both normal and tangential surface loads and for temperature changes through the thickness as well as varying temperatures over the reference surface. Over any portion of the boundary, a choice of thirteen separate boundary conditions is available. To ease data preparation, simple but effective generation schemes are built into the program. The program computes static deformations, stresses, and stress resultants occurring in the shell. Since it is designed for use by a large number of people, it contains error checks wherever possible and, except where needed for efficiency, very straightforward logic. The FORTRAN used is a low-level variety which aids in conversion from one computing facility to another. In its current form, it will accept up to 650 elements and 700 nodal points and requires a 64,000-word core. The program uses a singly dimensioned storage array for the total stiffness matrix and for the load vector. If a given problem fits within the limits of this storage array, the program functions as an in-core program. If additional storage is required, the program seeks on-line auxiliary storage which must be randomly accessible.

• Supplemental Notes:
  • Copies may be obtained from Harry Rowell, COSMIC Computer Center, Georgia University, Athens, Georgia, 30601
• Corporate Authors:

  Sandia Laboratories

  Analytical Development Division
  Albuquerque, NM  United States  87185

  Nuclear Regulatory Commission

  1717 H Street, NW
  Washington, DC  United States  20555
• Authors:
  • Beisinger, Selma E
• Publication Date: 1970-11

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: 191 p.

Subject/Index Terms

• TRT Terms: Computer programs; Cylinders (Geometry); Deformation; Finite element method; Shells (Structural forms); Stiffness matrix; Stresses; Structural analysis
• Uncontrolled Terms: Cylindrical shells
• Old TRIS Terms: Computer programs (Structural analysis); Shell deformation; Shell stresses; Stiffness matrices
• Subject Areas: Marine Transportation; Materials;

Filing Info

• Accession Number: 00010200
• Record Type: Publication
• Report/Paper Numbers: SC-RR-69-369 R&D Rpt
• Files: TRIS
• Created Date: Feb 25 1973 12:00AM