last modified: 03-JAN-1996 | catalog | categories | new | search |

NESC0759 CORTES.

CORTES, Steady-State and Transient Heat Flow and Stress Analysis in Pipe Joints

top ]
1. NAME OR DESIGNATION OF PROGRAM:  CORTES.
top ]
2. COMPUTERS
To submit a request, click below on the link of the version you wish to order. Only liaison officers are authorised to submit online requests. Rules for requesters are available here.
Program name Package id Status Status date
CORTES NESC0759/01 Tested 24-MAR-1981

Machines used:

Package ID Orig. computer Test computer
NESC0759/01 IBM 360 series IBM 360 series
top ]
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.
top ]
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.
top ]
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.
top ]
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".
top ]
7. UNUSUAL FEATURES OF THE PROGRAM:
top ]
8. RELATED AND AUXILIARY PROGRAMS

The program GRFPAK (NESC Abstract 760) provides plotting support for the CORTES programs.
top ]
9. STATUS
Package ID Status date Status
NESC0759/01 24-MAR-1981 Tested at NEADB
top ]
10. REFERENCES

- CORTES, NESC No.759.360, National Energy Software Center Note
  78-28, July 11, 1978.
NESC0759/01, included references:
- 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.
top ]
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.
top ]
12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NESC0759/01 FORTRAN-IV
top ]
13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:   OS/360.
top ]
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.
top ]
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
top ]
16. MATERIAL AVAILABLE
NESC0759/01
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
top ]
17. CATEGORIES
  • I. Deformation and Stress Distributions, Structural Analysis and Engineering Design Studies

Keywords: finite element method, heat flow, pipe joints, stress analysis, thermal stresses.