NESC0452 SHELL5

SHELL-5, Elastic Stress Analysis of 3-D Thin Shells Using Finite Elements Method

NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROBLEM OR FUNCTION, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, UNUSUAL FEATURES OF THE PROGRAM, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED, OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHOR, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: SHELL5

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2. COMPUTERS

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Program name	Package id	Status	Status date
SHELL-5	NESC0452/01	Tested	01-JUN-1974
SHELL-5	NESC0452/02	Tested	01-DEC-1973

Machines used:

Package ID	Orig. computer	Test computer
NESC0452/01	CDC 6600	CDC 6600
NESC0452/02	IBM 370 series	IBM 370 series

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3. DESCRIPTION OF PROBLEM OR FUNCTION

SHELL5  performs  an  elastic
stress analysis  of smoothly  curved,  arbitrarily shaped,  three-
dimensional thin shells with any desired distributions of material
properties,  boundary constraints,  and  mechanical, thermal,  and
displacement loading conditions.

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4. METHOD OF SOLUTION

SHELL5  uses  the  finite-element  method  to
formulate a  triangular plate element whose  membrane displacement
fields are  linear polynomial  functions and  bending displacement
field  is  a cubic  polynomial  function.   The shell  surface  is
approximated by  a network  of these  plate elements  of arbitrary
orientation.   Five degrees  of  freedom  (3 displacements  and  2
bending rotations) are  obtained at each nodal  point.  The direct
solution  of the  resulting  system  of equilibrium  equations  is
obtained  by the  segment block  tridiagonal Gaussian  elimination
method.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maxima of -
   1000 nodal points
   2000 elements
The maximum difference allowed for  coupled nodal point indexes is
23.

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6. TYPICAL RUNNING TIME

Approximately 60 minutes are required for a
full-capacity problem.

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7. UNUSUAL FEATURES OF THE PROGRAM:

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8. RELATED AND AUXILIARY PROGRAMS:

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9. STATUS

Package ID	Status date	Status
NESC0452/01	01-JUN-1974	Tested at NEADB
NESC0452/02	01-DEC-1973	Tested at NEADB

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10. REFERENCES

N. Prince, SHELL5 (SHELL-3D, Version  5) - A Computer
Program for the Structural Analysis of Arbitrary Three-dimensional
Thin Shells - A User's Manual, GA-9952, January 30, 1970.
             N. Prince  and Y. R.  Rashid, Structural  Analysis of
Shell  Intersections,  Paper  I-21,   Proceedings  Part  I,  First
International  Conference of  Pressure  Vessel Technology,  Delft,
Holland, October 1969.
             R.  W. Clough  and C.  P. Johnson,  A Finite  Element
Approximation  for  the  Analysis of  Thin  Shells,  International
Journal Solid Structures, Vol. 4, 1968.
             NTRAN, I/O Routines  for Tape and Drum,  Excerpt from
UNIVAC  1107 FORTRAN  IV Programmer's  Reference Manual,  UP-3569,
Rev. 1.

NESC0452/01, included references:

- N. Prince,
  SHELL5 (SHELL-3D VERSION 5)
  A Computer Program for the Structural Analysis of Arbitrary
  Three-dimensional Thin Shells - A User's Manual,
  GA-9952, January 30, 1970.

NESC0452/02, included references:

- N. Prince,
  SHELL5 (SHELL-3D, VERSION 5),
  A Computer Program for the Structural Analysis of Arbitrary
  Three-dimensional Thin Shells - A User's Manual,
  GA-9952, January 30, 1970.

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11. MACHINE REQUIREMENTS: 65K memory, 5 tapes, 3.5 million word drum
area

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NESC0452/01	FORTRAN-IV
NESC0452/02	FORTRAN+ASSEMBLER

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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED: EXEC2.

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

  CALL
TICKER refers to an 1108 system routine for logging job time used.
A substitute routine  will be required for use of  this program on
another  machine.   SHELL5  calls several  plotting  routines  not
included with the program.  These routines are proprietary and may
be dummied out.

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15. NAME AND ESTABLISHMENT OF AUTHOR

                 N. Prince
                 General Atomic Company
                 P. O. Box 81608
                 San Diego, California  92138

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16. MATERIAL AVAILABLE

NESC0452/01

File name	File description	Records
NESC0452_01.001	SOURCE PROGRAM (F4)	3553
NESC0452_01.002	SAMPLE INPUT	101
NESC0452_01.003	OUTPUT LIST OF SAMPLE PROBLEM	423

NESC0452/02

File name	File description	Records
NESC0452_02.001	FORTRAN SOURCE PROG.+NTRAN IN ASSEMBLER	3697
NESC0452_02.002	JCL+OVERLAY CARDS	40
NESC0452_02.003	SAMPLE PROBLEM	101
NESC0452_02.004	OUTPUT LIST OF SAMPLE PROBLEM	422

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17. CATEGORIES

I. Deformation and Stress Distributions, Structural Analysis and Engineering Design Studies

Keywords: elasticity, finite element method, mechanical structures, shells, three-dimensional.