NEA-1028 EDSPA.
EDSPA, 1-D Mechanical Displacement for Elastic, Thermoelastic, Viscoelastic Behaviour
NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROGRAM OR FUNCTION, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, UNUSUAL FEATURES OF THE PROGRAM, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED, OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHORS, MATERIAL, CATEGORIES
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| Program name | Package id | Status | Status date |
|---|---|---|---|
| EDSPA | NEA-1028/01 | Tested | 04-OCT-1989 |
Machines used:
| Package ID | Orig. computer | Test computer |
|---|---|---|
| NEA-1028/01 | CDC CYBER 175 | CDC CYBER 830 |
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3. DESCRIPTION OF PROGRAM OR FUNCTION
EDSPA solves the one dimensional mechanical displacement equation in radial (sphere) axissymetric cylindrical (infinite cylinder, slab) coordinates. The constitutive laws for the material to be considered can comprise the - elastic and/or
- thermoelastic and/or
- viscoplastic
behaviour. The boundary conditions allow to prescribe displacement and/or stress values. The delivered version of EDSPA is expecially suitable for the calculation of borehole problems in rock salt (heater boreholes or free converging boreholes or caverns) where convergence rates and/or contact pressures are of interest.
EDSPA solves the one dimensional mechanical displacement equation in radial (sphere) axissymetric cylindrical (infinite cylinder, slab) coordinates. The constitutive laws for the material to be considered can comprise the - elastic and/or
- thermoelastic and/or
- viscoplastic
behaviour. The boundary conditions allow to prescribe displacement and/or stress values. The delivered version of EDSPA is expecially suitable for the calculation of borehole problems in rock salt (heater boreholes or free converging boreholes or caverns) where convergence rates and/or contact pressures are of interest.
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4. METHOD OF SOLUTION
The coarse-mesh method is used to transform the displacement differential equation (quasistationary case: second order ordinary differential equation as a two point boundary value problem) into a system of algebraic equations. This three-diagonal system is solved with the Thomas algorithm (direct solver).
The coarse-mesh method is used to transform the displacement differential equation (quasistationary case: second order ordinary differential equation as a two point boundary value problem) into a system of algebraic equations. This three-diagonal system is solved with the Thomas algorithm (direct solver).
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6. TYPICAL RUNNING TIME
- For the calculation of free converging isothermal boreholes the running time is very short: 1 sec - 10 sec on CDC-CYBER 175.
- If non-isothermal cases with contact are considered the running time increases to 10-50 sec on CDC-CYBER 175 for a simple temperature history and to up to 300 sec on CDC-CYBER 175 for a very complicated temperature history.
Comparisons with usual FE-codes showed that the running time of those codes was up to a factor 10 higher than for EDSPA.
- For the calculation of free converging isothermal boreholes the running time is very short: 1 sec - 10 sec on CDC-CYBER 175.
- If non-isothermal cases with contact are considered the running time increases to 10-50 sec on CDC-CYBER 175 for a simple temperature history and to up to 300 sec on CDC-CYBER 175 for a very complicated temperature history.
Comparisons with usual FE-codes showed that the running time of those codes was up to a factor 10 higher than for EDSPA.
NEA-1028/01
NEA-DB ran the test case included in this package on a CDC CYBER 830 computer in 366 seconds of CPU time.[ top ]
7. UNUSUAL FEATURES OF THE PROGRAM
The delivered version allows to consider a
- temperature-dependent thermal expansion coefficient,
- constant Young's modulus,
- time- and space-dependent temperature distributions (via input data),
- secondary (stationary) creep for a von-Mises solid
(volume-constant-creep)
- contact of a converging borehole (cavern) with an elastically
reacting solid.
The delivered version allows to consider a
- temperature-dependent thermal expansion coefficient,
- constant Young's modulus,
- time- and space-dependent temperature distributions (via input data),
- secondary (stationary) creep for a von-Mises solid
(volume-constant-creep)
- contact of a converging borehole (cavern) with an elastically
reacting solid.
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NEA-1028/01, included references:
- M. Schlich and R. Elsen:A Program to Calculate One-Dimensional Stresses and Strains in
Simple Bodies with Elastic-Viscoplastic Behaviour Under Thermal
Stress. (in German) .
(August 1985).
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NEA-1028/01
| File name | File description | Records |
|---|---|---|
| NEA1028_01.001 | Information file | 50 |
| NEA1028_01.002 | JCL and control information | 12 |
| NEA1028_01.003 | EDSPA FORTRAN source program | 1483 |
| NEA1028_01.004 | Sample problem input (TAPE 5) | 14 |
| NEA1028_01.005 | Sample problem input (TAPE 8) | 19 |
| NEA1028_01.006 | Sample problem output | 31 |
| NEA1028_01.007 | Sample problem output (TAPE 7) | 86 |
| NEA1028_01.008 | Sample problem output (TAPE 6) | 1943 |
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- I. Deformation and Stress Distributions, Structural Analysis and Engineering Design Studies
Keywords: elasticity, one-dimensional, stress analysis, stresses, viscosity.