NEA-0361 TRESS.
TRESS, Triangular Mesh Stress and Strain in R-Z, X-Y Geometry for Various Load and Temperature
NAME OR DESIGNATION OF PROGRAM, COMPUTER, NATURE OF PHYSICAL PROBLEM SOLVED, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, FEATURES, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED, OTHER RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHOR, MATERIAL, CATEGORIES
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| 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.
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.
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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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.
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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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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- 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.