NESC0759 CORTES.

1. NAME OR DESIGNATION OF PROGRAM:  CORTES.

3. DESCRIPTION OF PROBLEM OR FUNCTION

CORTES is a package consisting  of five finite element programs developed for the stress analysis of ANSI Bl6.9 tee joints. The five programs are:
SA, the stress analysis program which analyzes pipe joints for the effects of internal pressure and arbitrary combinations of bending moment, torsional moment, axial force, and sheer force on the ends of the branch and run pipes. A limited temperature stress analysis capability is provided.
EP, the elasto-plastic stress analysis program which analyzes pipe joints for the effects of internal pressure and arbitrary combinations of forces (including moments) and displacements including rotations imposed on the ends of the run and branch pipes.  THFA, the transient heat flow analysis program which determines the time history of temperature variations in the pipe joints. The joint is assumed initially to be at a uniform temperature. Temperature changes are then specified at the inner surface, and a heat flow analysis is performed assuming a perfectly insulated outer surface.
SHFA, the steady-state heat flow analysis program which determines the steady-state temperature distribution in pipe joints. Temperatures are specified on given cross-sections of the branch and run portions of the tee joint, and the temperature distribution throughout the remainder of the joint is calculated assuming the inner and outer surfaces are perfectly insulated.
TSA, accepts as input, the output data from THFA or SHFA and performs the thermal stress analysis on the pipe joints.

4. METHOD OF SOLUTION

The joint is idealized as a system of 8-node hexahedral finite elements. A modified Zienkiewicz-Irons isoparametric element which has superior bending properties compared with the unmodified isoparametric element is used. The transient heat flow (THFA) problem is solved by a step-by-step integration procedure assuming linear variation of temperature with time within  a step.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

EP - Displacements and strains are assumed to be small and no geometric (initial stress) stiffness effects are considered. The materials are assumed to yield accordin to the von Mises criterion,  and tangent stress-strain relationships after yield are determined according to conventional flow rule procedures for strain hardening  materials.
THFA - The specified temperature variations at the inner surface are assumed to be symmetrical about the x-y plane.
SHFA - The temperature distribution is assumed to be symmetric about the x-y plane.
SA and TSA - Any nodes introduced within the wall thickness are assumed to be uniformly spaced through the thickness.

6. TYPICAL RUNNING TIME

Execution time varies according to the data used. Excluding wait time, it took approximately 140, 190, 40, 30, and 120 seconds to compile and execute each of the five test problems on an IBM370/195. A large amount of wait time is attributable to numerous I/O operations and is inversely proportional to the size of the container array "A".

7. UNUSUAL FEATURES OF THE PROGRAM:

8. RELATED AND AUXILIARY PROGRAMS

The program GRFPAK (NESC Abstract 760) provides plotting support for the CORTES programs.

10. REFERENCES

- CORTES, NESC No.759.360, National Energy Software Center Note
  78-28, July 11, 1978.

- B.R. Bass, J.W. Bryson and S.E. Moore:
  Validation of the Finite Element Stress Analysis Computer Program
  CORTES-SA for Analyzing Piping Tees and Pressure Vessel Nozzles
- A.N. Gantayat and G.H. Powell:
  Stress Analysis of Tee Joints by the Finite Element Method
  ORNL-3193-1, UC SESM 73-6 (February 1973)
- G.H. Powell:
  Finite Element Analysis of Elasto-Plastic Tee Joints
  ORNL-Sub-3193-2, UC SESM 74-14 (Septamber 1974)
- R.E. Textor:
  User's Guide for SHFA: Steady-State Heat Flow Analysis of Tee
  Joints by the Finite Element Method
  UCCND/CSD/INF-60 (January 1976)
- Zs. Revesz:
  Qualification of Unreinforced Man-Holes in Thin-Walled Piping of
  Auxiliary/Emergency Cooling Water Systems.  Special reprint of a
  paper presented at Int. Meeting on 'Thermal Nuclear Reacor Safety'
  August 29-September 2, 1982, Chicago.

11. MACHINE REQUIREMENTS

All five programs use card input and a line printer. Execution of the SA test problem required 960K bytes of memory and 12 scratch disk units. The EP test problem required 920K  bytes of memory and 11 scratch disk units. The THFA sample problem required 460K bytes of memory and 6 scratch disk units. The SHFA sample problem required 350K bytes of memory and 6 scratch disk units. The TSA sample problem used 880K bytes of memory and 11 scratch disk units.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:   OS/360.

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

Four environmental system routines, ITIME, DATE, ICTICK, and PLOT, used by CORTES were not supplied. Dummy routines have been included for completenes. ITIME and ICTICK return the elapsed wall time and elapsed CPU time, respectively, in hundredths of a second since the  previous call to these routines. The first call initializes the routines. PLOT refers to proprietary CalComp software and DATE returns the date in the form MM/DD/YY.
Since comment blocks exceeding 30 consecutive lines are truncated during a FORTRAN G compilation, the FORTRAN H compiler should be used to insure that all comments are listed for the EP, THFA, and SHFA programs.
The output written to unit 10 by SHFA during execution of the sample problem is read as input from unit 10 for the TSA sample problem.
It should be noted that some variables in common blocks /GASS/ and /NQUAD/ may not always be stored identically in all routines of  a CORTES program.

15. NAME AND ESTABLISHMENT OF AUTHORS

                 A. N. Gantayat and G. H. Powell
                 Structural Engineering and Structural Mechanics
                 College of Engineering
                 University of California
                 Berkeley, California  94730

                 R. E. Textor and B. R. Bass
                 Computer Sciences Division
                 Union Carbide Corporation, Nuclear Division
                 P. O. Box P
                 Oak Ridge, Tennessee  37830

                 J. W. Bryson and S. E. Moore
                 Engineering Technology Division
                 Oak Ridge National Laboratory
                 Oak Ridge, Tennessee  37830

File name	File description	Records
NESC0759_01.002	INFORMATION	10
NESC0759_01.003	SA - SOURCE PROGRAM (F4,EBCDIC)	4298
NESC0759_01.004	SA - JCL	62
NESC0759_01.005	SA - SAMPLE PROBLEM INPUT DATA	10
NESC0759_01.006	SA - SAMPLE PROBLEM PRINTED OUTPUT	6406
NESC0759_01.007	EP - SOURCE PROGRAM (F4,EBCDIC)	6250
NESC0759_01.008	EP - JCL	55
NESC0759_01.009	EP - SAMPLE PROBLEM INPUT DATA (CASE 1)	19
NESC0759_01.010	EP - SAMPLE PROBLEM INPUT DATA (CASE 2)	19
NESC0759_01.011	EP - SAMPLE PROBLEM PRINTED OUTPUT (CASE 1)	14621
NESC0759_01.012	EP - SAMPLE PROBLEM PRINTED OUTPUT (CASE 2)	1569
NESC0759_01.013	THFA - SOURCE PROGRAM (F4,EBCDIC)	3126
NESC0759_01.014	THFA - JCL	32
NESC0759_01.015	THFA - SAMPLE PROBLEM INPUT DATA	64
NESC0759_01.016	THFA - SAMPLE PROBLEM PRINTED OUTPUT	12822
NESC0759_01.017	SHFA - SOURCE PROGRAM (F4,EBCDIC)	2967
NESC0759_01.018	SHFA - JCL	30
NESC0759_01.019	SHFA - SAMPLE PROBLEM INPUT DATA	15
NESC0759_01.020	SHFA - SAMPLE PROBLEM PRINTED OUTPUT	2529
NESC0759_01.021	TSA - SOURCE PROGRAM (F4,EBCDIC)	3600
NESC0759_01.022	TSA - JCL	43
NESC0759_01.023	TSA - SAMPLE PROBLEM INPUT DATA	6
NESC0759_01.024	TSA - SAMPLE PROBLEM PRINTED OUTPUT	10398