NESC0251 SAFE-AXISYM.

SAFE-AXISYM, Stress Analysis of Axisymmetric Composite Structure by Finite Elements Method

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

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1. NAME OR DESIGNATION OF PROGRAM: SAFE-AXISYM.

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2. COMPUTERS

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Program name	Package id	Status	Status date
SAFE-AXISYM	NESC0251/01	Tested	01-AUG-1967

Machines used:

Package ID	Orig. computer	Test computer
NESC0251/01	IBM 360 series	IBM 360 series

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3. NATURE OF PHYSICAL PROBLEM SOLVED

SAFE-AXISYM is a program for the analysis of multi-material axisymmetric composite structures. It is designed for the analysis of heterogeneous structures such as reinforced and/or prestressed concrete vessels. The structure is assumed to be linearly elastic, and only bodies of revolution subjected to axisymmetric loading can be treated.

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4. METHOD OF SOLUTION

SAFE-AXISYM uses a finite element method with a modified Gauss-Seidel iteration scheme. A reference grid subdivides the structure into ring-like small, finite elements, the vertices of which are called nodes. The grid may be generated by hand, by the computer or by a combination of the two methods.
Each node has two degrees of freedom, translation in the and in the axial direction. Both zero and non-zero fixed displacement constraints may be assumed, and the loading condition may be mechanical and/or thermal.

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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 nodes = 475.
Maximum number of elements = 1100.

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6. TYPICAL RUNNING TIME

12 minutes are required for a full capacity problem. The number of iterations required to reach static equilibrium is dependent on the number of nodes, structural flexibility, loading condition, and node-numbering sequence. A structure of moderate size and flexibility will usually converge in 300 to 400 iterations.

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7. UNUSUAL FEATURES: UNUSUAL FEATURES OF THE PROGRAM

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8. RELATED AND AUXILIARY PROGRAMS

SAFE-AXISYM is primarily intended for thick-walled structures where bending is small. Extremely flexible structures such as long, thin, laterally-loaded beams converge very slowly and SAFE-PCRS (ACC abstract 250) should be used rather than SAFE-AXISYM for problems of this type. An auxiliary program has been written to produce a plot tape for the SC-4020 recorder from the stress tapes written by SAFE-AXISYM.

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9. STATUS

Package ID	Status date	Status
NESC0251/01	01-AUG-1967	Tested at NEADB

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10. REFERENCES

- D.C. Cornell:
  SAFE-AXISYM, A Computer Program for the Design of Composite Bodies of Revolution - Input Instructions.
  GA-6697, October 15, 1965.
- 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

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11. MACHINE REQUIREMENTS: 32k memory.

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NESC0251/01	FORTRAN-IV

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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED: IBM 7040/7044 operating system (16/32k), version ix.

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

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15. NAME AND ESTABLISHMENT OF AUTHOR

                 D. C. Cornell
                 Gulf General Atomic Incorporated
                 P. O. Box 608
                 San Diego, California  92112

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16. MATERIAL AVAILABLE

NESC0251/01