# Implementation of a transient creep model for natural rock salt as a material-response subroutine for SANCHO

## Abstract

The equations for determining the stress in a material response subroutine of SANCHO are formulated using a transient creep model for natural rock salt. It is shown that the equation for the primary creep strain causes the system of equations to be numerically stiff when Runge-Kutta-Fehlberg formulas are used for numerical integration. This stiffness can be eliminated by using an approximate solution of the primary creep strain equation. Sample calculations with a material response subroutine implementing the solution method for the transient creep law are described.

- Authors:

- Publication Date:

- Research Org.:
- Sandia National Labs., Albuquerque, NM (USA)

- OSTI Identifier:
- 5915722

- Report Number(s):
- SAND-81-1163

ON: DE82003197; TRN: 82-001115

- DOE Contract Number:
- AC04-76DP00789

- Resource Type:
- Technical Report

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 58 GEOSCIENCES; 12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; COMPUTER CODES; S CODES; SALT DEPOSITS; CREEP; GEOLOGIC DEPOSITS; MECHANICAL PROPERTIES; 580300* - Mineralogy, Petrology, & Rock Mechanics- (-1989); 052002 - Nuclear Fuels- Waste Disposal & Storage; 990200 - Mathematics & Computers

### Citation Formats

```
Montgomery, S.T.
```*Implementation of a transient creep model for natural rock salt as a material-response subroutine for SANCHO*. United States: N. p., 1981.
Web.

```
Montgomery, S.T.
```*Implementation of a transient creep model for natural rock salt as a material-response subroutine for SANCHO*. United States.

```
Montgomery, S.T. Sat .
"Implementation of a transient creep model for natural rock salt as a material-response subroutine for SANCHO". United States.
```

```
@article{osti_5915722,
```

title = {Implementation of a transient creep model for natural rock salt as a material-response subroutine for SANCHO},

author = {Montgomery, S.T.},

abstractNote = {The equations for determining the stress in a material response subroutine of SANCHO are formulated using a transient creep model for natural rock salt. It is shown that the equation for the primary creep strain causes the system of equations to be numerically stiff when Runge-Kutta-Fehlberg formulas are used for numerical integration. This stiffness can be eliminated by using an approximate solution of the primary creep strain equation. Sample calculations with a material response subroutine implementing the solution method for the transient creep law are described.},

doi = {},

journal = {},

number = ,

volume = ,

place = {United States},

year = {1981},

month = {8}

}

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