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NEA-0361 TRESS.

TRESS, Triangular Mesh Stress and Strain in R-Z, X-Y Geometry for Various Load and Temperature

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1. NAME OR DESIGNATION OF PROGRAM:  TRESS.
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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
TRESS NEA-0361/01 Tested 01-MAR-1978

Machines used:

Package ID Orig. computer Test computer
NEA-0361/01 IBM 370 series IBM 370 series
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3. NATURE OF PHYSICAL PROBLEM SOLVED

The program considers the problem of evaluating stresses and strains in two dimensions, given various  loading and temperature conditions. Provision is made for "fixed displacements" and "lines of symmetry". R-z and x-y geometries are available, and in the latter the program is able to do either a plane stress or a plane strain calculation.
Also available is an option enabling the user to specify only the boundary of the body; the program will then design its own triangular element mesh.
     Various graphical output options are available.
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4. METHOD OF SOLUTION

The program uses triangular finite elements. A set of simultaneous equations (stiffness matrix) is set up connecting the total loads at nodal points with the displacements of these points.
These equations are solved using the routine SPARSE, in such a way that additional loading cases may be done with negligible extra  running time.
Irregular triangular elements may be used, allowing great flexibility in the representation of irregular bodies.
Arbitrary variation of material parameters is achieved by covering the body with a set of circles, triangles, or squares, within each of which material parameters are prescribed.
     Material properties may vary with temperature.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

About 1000 nodes. Not more than 500 fixed displacements and 500 "line of symmetry" nodes.
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6. TYPICAL RUNNING TIME

The time for a case depends not only on the number of nodes, but also on their relative positions and order which affect the bandwidth of the matrix, and the amount of output requested. Typically: 200 nodes 3 minutes, 700 nodes 30 minutes.
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7. UNUSUAL FEATURES: UNUSUAL FEATURES OF THE PROGRAM
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8. RELATED AND AUXILIARY PROGRAMS

GRIDFRAME (ref.2) and SPANDE (ref.3) apply similar methods to two           and three dimensional frameworks.
HEATRAN (ref.4) obtains the temperature distribution for the same  geometry as TRESS, and output from HEATRAN is accepted by         TRESS when thermal stresses are to be calculated.
CRESTA is a time dependent version of TRESS which takes account of      creep.
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9. STATUS
Package ID Status date Status
NEA-0361/01 01-MAR-1978 Tested at NEADB
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10. REFERENCES

REFERENCES.
- W.D. Collier, J.P. Ellington, and P.M. Rees:
  "TRESS" - A Finite Element Code for Stress Analysis Problems
  TRG Report 1813(R).
- CSG/PIES UTT028.
- CSG/PIES UTT017.
- CSG/PIES UTT001.
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11. MACHINE REQUIREMENTS

  (i) Core 163k bytes.
(ii) Data volumes - 5 work files on disc.
(iii) CALCOMP 565 incremental plotter.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-0361/01 FORTRAN-IV
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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED:  7J.
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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

W.D. Collier
Computer Section
Central Technical Services
Risley
United Kingdom
-
J.P. Ellington, M.E.S.
Central Technical Services
Risley
United Kingdom
-
P.M. Rees
Formerly Computer Section, C.T.S. Risley.
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16. MATERIAL AVAILABLE
NEA-0361/01
File name File description Records
NEA0361_01.001 INFORMATION 2
NEA0361_01.002 SOURCE PROGRAM (F4,EBCDIC) 6329
NEA0361_01.003 RISLEY SUBROUTINES (F4,EBCDIC) 1784
NEA0361_01.004 RISLEY SUBROUTINES (ASSEMBLER,EBCDIC) 614
NEA0361_01.005 SETMAT,SPARSE,SPARX,SPARE (F4,EBCDIC) 626
NEA0361_01.006 DD CARDS FOR EXECUTION 14
NEA0361_01.007 OVERLAY CARDS 45
NEA0361_01.008 SAMPLE PROBLEM INPUT DATA 14
NEA0361_01.009 SAMPLE PROBLEM PRINTED OUTPUT 1966
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17. CATEGORIES
  • I. Deformation and Stress Distributions, Structural Analysis and Engineering Design Studies

Keywords: finite element method, mesh generation, r-z, stress analysis, two-dimensional, x-y.