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NEA-1028 EDSPA.

EDSPA, 1-D Mechanical Displacement for Elastic, Thermoelastic, Viscoelastic Behaviour

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1. NAME OR DESIGNATION OF PROGRAM:  EDSPA.
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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
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.
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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).
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Because of EDSPA's simple one-dimensional formulation there are no restrictions for storage allocation and argument ranges.
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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.
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.
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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.
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8. RELATED AND AUXILIARY PROGRAMS

Every known temperature calculation code can be used to provide temperature input data for EDSPA.
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9. STATUS
Package ID Status date Status
NEA-1028/01 04-OCT-1989 Tested at NEADB
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10. REFERENCES:
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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11. MACHINE REQUIREMENTS:  118,000 words on CDC CYBER 830.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-1028/01 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  NOS 2.5.1.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHORS

          M. Schlich, R. Elsen
          Lehrauftrag Leistungsreaktoren, RWTH Aachen
          Schinkelstrasse 6
          5100 Aachen, W. Germany
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16. MATERIAL AVAILABLE
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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17. CATEGORIES
  • I. Deformation and Stress Distributions, Structural Analysis and Engineering Design Studies

Keywords: elasticity, one-dimensional, stress analysis, stresses, viscosity.