Triaxial test sample size effect on stress relaxation of wheat en masse
1991
Bock, R.G. | Puri, V.M. | Manbeck, H.B.
The triaxial test was used to quantify the sample size effect on stress relaxation response of wheat en masse. Three cylindrical sample sizes (diameter x height) were studied: 36 mm X 76 mm, 70 mm X 140 mm and 102 mm X 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 X 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 x 203 mm). Elastic properties were more sensitive to sample size than the viscous properties.
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