Triaxial test sample size effect on stress relaxation of wheat en masse

Research output: Contribution to journalArticle

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Abstract

The triaxial test was used to quantify the sample size effect on stress relaxation response of wheat en masse. Three cylindrical sample sizes (diameter × height) were studied: 36 mm × 76 mm, 70 mm × 140 mm and 102 mm × 203 mm. Three replications of each sample size for the following loading conditions and physical properties were studied: confining pressure (32 kPa), axial strain (2.5×10-3 mm/mm), initial bulk density (787 kg/m3) and moisture content (15% d.b.). The paired t-test showed no significant difference in the elastic moduli for the range of sample size studied. The stress relaxation data were modeled to within 5% using the generalized Maxwell model. The most repeatable load response with least data scatter was observed for the largest sample (102 mm × 203 mm). Elastic properties were more sensitive to sample size than the viscous properties.

Original languageEnglish (US)
Pages (from-to)966-971
Number of pages6
JournalTransactions of the American Society of Agricultural Engineers
Volume34
Issue number3
StatePublished - May 1 1991

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stress relaxation
size effect
Stress relaxation
triaxial test
Sample Size
Triticum
wheat
Moisture
Physical properties
Elastic moduli
testing
sampling
elastic property
elastic modulus
confining pressure
Elastic Modulus
bulk density
moisture content
physical property
modulus of elasticity

All Science Journal Classification (ASJC) codes

  • Agricultural and Biological Sciences (miscellaneous)

Cite this

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abstract = "The triaxial test was used to quantify the sample size effect on stress relaxation response of wheat en masse. Three cylindrical sample sizes (diameter × height) were studied: 36 mm × 76 mm, 70 mm × 140 mm and 102 mm × 203 mm. Three replications of each sample size for the following loading conditions and physical properties were studied: confining pressure (32 kPa), axial strain (2.5×10-3 mm/mm), initial bulk density (787 kg/m3) and moisture content (15{\%} d.b.). The paired t-test showed no significant difference in the elastic moduli for the range of sample size studied. The stress relaxation data were modeled to within 5{\%} using the generalized Maxwell model. The most repeatable load response with least data scatter was observed for the largest sample (102 mm × 203 mm). Elastic properties were more sensitive to sample size than the viscous properties.",
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Triaxial test sample size effect on stress relaxation of wheat en masse. / Bock, Randall Gray; Puri, Virendra; Manbeck, H. B.

In: Transactions of the American Society of Agricultural Engineers, Vol. 34, No. 3, 01.05.1991, p. 966-971.

Research output: Contribution to journalArticle

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