Statistical analysis of transient creep data from laboratory tests on Avery Island dome salt

Technical Report · Fri Apr 01 04:00:00 EST 1983

OSTI ID:6086739

Senseny, P E; Mellegard, K D; Eslinger, N M

A statistical analysis of transient creep data from Avery Island dome salt was performed to determine the influence of specimen size and to assess the capability of simple creep laws to reproduce the laboratory data. Two specimen sizes were studied: small 50-mm-diameter specimens and larger, 100-mm-diameter specimens. Results show that the transient creep of the small specimens is a stronger function of stress, time and temperature than is that of the larger specimens. This implies that transient creep laws determined from laboratory tests on relatively small specimens are conservative when used for repository calculations because they predict more strain than would be measured in the repository. When the creep laws are used to extrapolate from the times investigated in the laboratory to times of repository interest, confidence intervals on creep strain become very wide. This result indicates the need for long-term laboratory data and for constitutive laws that have a firmer physical foundation. Linear and non-linear regression algorithms were employed. Constitutive laws obtained by both procedures fit the data equally well, but the parameter values obtained depend upon which regression algorithm is used. Because of the large difference in parameter values that can be found, extreme caution must be exercised when attributing physical significance to parameter values obtained by regression.

• Research Organization: RE/SPEC, Inc., Rapid City, SD (USA)
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 6086739
• Report Number(s): ONWI-236; ON: DE83014062
• Country of Publication: United States
• Language: English

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