NESC0250 SAFE-PCRS.

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

3. NATURE OF PHYSICAL PROBLEM SOLVED

SAFE-PCRS numerically determines  the stress and strain distribution within either homogeneous or heterogeneous thick-walled bodies of revolution. It is designed for  the analysis of multi-material axisymmetric composite structures such as reinforced and/or prestressed concrete vessels. Deformations must be within the elastic limit of the materials considered and only bodies of revolution subjected to axisymmetric loading can be treated.

4. METHOD OF SOLUTION

SAFE-PCRS employs the finite element method. A reference GRID defining the elements may be generated by hand, by  computer, or by a combination of the two. The vertices of the elements are called nodes. Each node has two degrees of freedom, translation in the radial and in the axial direction. A displacement function for the general element is assumed in the form of polynomials. By matrix formulation and manipulation, the internal potential energy is added to the external potential energy of the system. The total energy is minimized by differentiation and the static equilibrium of the structure determined.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

   Maximum number of nodes = 1200.
   Maximum number of elements = 2250.
   Not valid for incompressible materials.

6. TYPICAL RUNNING TIME:  24 minutes are required for a full capacity problem.

7. UNUSUAL FEATURES: UNUSUAL FEATURES OF THE PROGRAM

8. RELATED AND AUXILIARY PROGRAMS

SAFE-AXISYM (ACC abstract 251) the method of solution is iterative in SAFE-AXISYM as opposed to the direct method used in SAFE-PCRS and the capacity of SAFE-AXISYM is reduced allowing all computation in the 32k core. An auxiliary program has been written to produce a plot tape for the SC-4020 recorder from the stress tapes written by SAFE-PCRS.
SAFE-PCRS is more versatile, less expensive to use, easier to convert between operating systems, and has far less complicated input data than target, an earlier IBM7044 program.

10. REFERENCES

- D.C. Cornell:
SAFE-PCRS, A Computer Program for the Stress Analysis of Composite Bodies of Revolution - Input Instructions.
  GA-6588, August 1 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

11. MACHINE REQUIREMENTS:  32k memory.

13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED

IBM 7040/7044 operating system (16/32k), version ix. Tape unit assignments are as follows

                         B5   stress tape
                         C5   stress tape
                         C6   stiffness tape
                         C7   displacement tape

14. ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

Four computer tapes can be generated on each original run of the program. All tapes must be used on each run, regardless of their eventual use.

15. NAME AND ESTABLISHMENT OF AUTHOR

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

File name	File description	Records
NESC0250_01.001	SOURCE & DATA %360/65<	1592
NESC0250_01.002	OUTPUT	770