NESC0252 SAFE-PLANE

SAFE-PLANE, Stress Analysis of Planar Structure by 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 AUTHORS, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: SAFE-PLANE

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2. COMPUTERS

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Program name	Package id	Status	Status date
SAFE-PLANE	NESC0252/02	Tested	01-AUG-1967

Machines used:

Package ID	Orig. computer	Test computer
NESC0252/02	IBM 360 series	IBM 360 series

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3. DESCRIPTION OF PROBLEM OR FUNCTION

SAFE-PLANE is applied to two-
dimensional structures of arbitrary geometry under in-plane loads.
Either plane stress or plane strain conditions may be imposed.
Mechanical and thermal loads are permitted.

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4. METHOD OF SOLUTION

The   finite-element   method  is   used   to
construct a  mathematical model  by assembling  discrete elements.
The  total potential  energy of  the structure  is determined  and
subsequently  minimized   by  iteration   on  components   of  the
displacement field  until static equilibrium  of the  structure is
attained.  Strains  and stresses are  computed from  the resulting
displacements.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

   Multi-material structures with varying rigidities converge very
        slowly.
   Not valid for incompressible materials.
   Maximum number of nodal points = 675.
   Maximum number of elements = 1350.

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6. TYPICAL RUNNING TIME

Less than 3 minutes are required for a full
capacity problem on the 1108.

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7. UNUSUAL FEATURES OF THE PROGRAM:

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8. RELATED AND AUXILIARY PROGRAMS

Other programs useful  for stress
analysis of  prestressed concrete reactor vessels  are SAFE-AXISYM
and SAFE-PCRS for axisymmetric composite structures and SAFE-SHELL
(NESC Abstract 253)  for thin shells of revolution.   On the 1108,
ICON2   (a  contour   plotting   program)   plots  the   pointwise
stress/strain  output as  a series  of  equal intensity  contours.
SAFE-PLANE replaces PIZZA.

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9. STATUS

Package ID	Status date	Status
NESC0252/02	01-AUG-1967	Tested at NEADB

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10. REFERENCES

Input Instructions for SAFE-PLANE Computer Program.
             Yusef R.  Rashid, Analysis of  Axisymmetric Composite
Structures  by the  Finite Element  Method,  GA-6763, October  15,
1965.
             Prestress Concrete Reactor Vessels Analytical Methods
Development, GACD-7258, June 1966.
             D. C. Cornell, SAFE-PLANE, A Computer Program for the
Stress Analysis and Design of  Two-dimensional Composite Bodies, A
User's Manual, GA-7851, June 30, 1967.

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11. MACHINE REQUIREMENTS

Approximately 47000 words storage (decimal)
plus the operating system (1108). Requirements can be easily
reduced by simple adjustment of DIMENSION statements.

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NESC0252/02	FORTRAN-IV

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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

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15. NAME AND ESTABLISHMENT OF AUTHORS

   1108          D. C. Cornell
                 General Atomic Company
                 P. O. Box 81608
                 San Diego, California  92138
   6600          Morris Reich
                 Brookhaven National Laboratory
                 Upton, Long Island, New York  11973

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16. MATERIAL AVAILABLE

NESC0252/02