The linear regression model was applied on the qualitative data of grain sized obtained from different granite samples for evaluating the effect of grain size on uniaxial
compressive and tensile strength.
The same pattern was observed for uniaxial
measures of [PL.sub.AP] (LL = 47.16 [+ or -] 13.18 au; C7 = 12.96 [+ or -] 2.89 au; p < 0.01; 95% CI 30.70 to 37.69; d = 3.58), [PL.sub.ML] (LL = 46.29 [+ or -] 12.62 au; C7 = 10.68 [+ or -] 2.15 au; p < 0.01; 95% CI 32.37 to 38.86; d = 3.93), and [PL.sub.V] (LL = 44.89 [+ or -] 11.22 au; C7 = 20.05 [+ or -] 3.41 au; p < 0.01; 95% CI 22.30 to 27.38; d = 3.00), with increased PL displayed at the LL.
According to the standard uniaxial
specimen of rubber like materials, the narrow part of the standard specimen thickness is 2.0 mm [+ or -] 0.2 mm, and the length of it is 25.0 mm[+ or -]0.5 mm.
tension tests were conducted on a universal electrohydraulic servo rock mechanics test machine, MTS 815, with a load bearing capacity of 10000 kN, as shown in Figure 2(b).
After the heat treatment, the marble specimens were subjected to a uniaxial
compression test using an MTS815.2 rock mechanics servocontrolled testing system.
According to these figures, under uniaxial
tension, the stress-strain response follows a linear elastic relationship until the value of the fracture stress, [[sigma].sub.to], is reached.
The shift of [T.sub.m] and the change of the [[epsilon].sub.m] value under the applied uniaxial
pressure were ~3 [degrees]C/kbar and 250/kbar for x = 0.01 (Fig.
The characteristic of rubber material are determined by constants, [C.sub.10], [C.sub.01], [D.sub.1], [J.sup.el], [[micro].sub.i], [[alpha].sub.i], of Equation 5, 6, which can be obtained from uniaxial
tension test, planar tension test, biaxial tension test .
Substituting these in equation 7 we get Strain invariants in terms of Principle Stretch Ratios for uniaxial
test, Equation 9
Typically this model can be calibrated using a true stress-true strain curve generated by uniaxial
load with a full tension-compression-tension (TCT) or compression-tension-compression (CTC) cycle.
In consideration of the potential application of concrete structure, as mentioned in the 1st section of this paper, uniaxial
tensile and compressive strain rate were applied to the atomic structure of C-S-H gel at a temperature range from 100 K to 500 K.