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NESC0253 SAFE-SHELL

SAFE-SHELL, Stress Analysis of Axisymmetric Thin Shells by Finite Elements Method

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1. NAME OR DESIGNATION OF PROGRAM:  SAFE-SHELL
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2. COMPUTERS
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Program name Package id Status Status date
SAFE-SHELL NESC0253/01 Tested 01-AUG-1967

Machines used:

Package ID Orig. computer Test computer
NESC0253/01 IBM 360 series IBM 360 series
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3. DESCRIPTION OF PROBLEM OR FUNCTION

SAFE-SHELL is used to design and analyze axisymmetric thin-shell structures of arbitrary generatrices under axisymmetric mechanical and/or thermal loading conditions. The intersection of two or more shells can be treated.
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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 differentiating the energy function with respect to each displacement component. The equilibrium equations are then solved by tri-diagonalization. Strains and stresses are computed from the resulting displacement field.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

   Maximum number of nodal points = 181.
   Maximum number of elements = 180.
Capacity can be easily increased at cost of storage requirements.
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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-PLANE (NESC Abstract 252) for plane structures involving in-plane stress distributions.
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9. STATUS
Package ID Status date Status
NESC0253/01 01-AUG-1967 Tested at NEADB
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10. REFERENCES

Input Instructions for SAFE-SHELL Computer Program.
             Finite  Element  Analysis of  Axisymmetric  Composite
Structures, GA-6303, June 4, 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.
             D. C. Cornell, SAFE-SHELL, A Computer Program for the
Stress  Analysis of  Thin-shell  Bodies  of Revolution,  A  User's
Manual, GA-7852, June 30, 1967.
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11. MACHINE REQUIREMENTS:  32K memory.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NESC0253/01 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 AUTHOR

                 D. C. Cornell
                 General Atomic Company
                 P. O. Box 81608
                 San Diego, California  92138
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16. MATERIAL AVAILABLE
NESC0253/01
File name File description Records
NESC0253_01.001 SOURCE & DATA %360/65< 1273
NESC0253_01.002 OUTPUT 252
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17. CATEGORIES
  • I. Deformation and Stress Distributions, Structural Analysis and Engineering Design Studies

Keywords: finite element method, mechanical structures, shells, strains, stresses.