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NESC0251 SAFE-AXISYM.

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

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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
File name File description Records
NESC0251_01.001 SOURCE & DATA %360/65< 2002
NESC0251_01.002 OUTPUT 2345
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17. CATEGORIES
  • I. Deformation and Stress Distributions, Structural Analysis and Engineering Design Studies

Keywords: elasticity, heterogeneous, stress analysis, stresses.