The initial part of the stress-strain curve of the last cycle in the cyclic compression test
was replotted in Fig.
Finally, the parameter [alpha], which defines the pressure sensitivity of the yield stress, is calibrated from a uniaxial compression test
using a similar local approach.
While the uniaxial compression test
is well documented in ASTM D575, roughness and lubrication were found to affect force-deflections quite significantly.
Generally in most of the studies done on polymer characterization, where shear and extensional viscosity measurement are fairly a routine, compression test
is used to characterize instantaneous behavior of material under conditions similar to that of lens compaction molding.
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control and reporting system.
Laboratory CBR Apparatus ,Unconfined compression test
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A uniaxial compression test
is a better choice to obtain true stress-strain data at large strain since it can be globally homogeneous for the full range of deformation.
The main difficulty is to keep a homogeneous strain field in the specimen during the compression test
In the generalized DSGZ constitutive model for a uniaxial compression test
, the compressive stress [[sigma].
In comparing the results with that of Table 2, it is interesting to note that, although the compression test
generates shear yielding in the blend, the activation energy of the [alpha] process compares reasonably well with that obtained by the tensile test.
Figure 15 shows a uniaxial compression test
with one load-reload cycle together with theoretical predictions [TABULAR DATA FOR TABLE 2 OMITTED] obtained using both the NVE and VP models.
Aiming to reject the influence of technical reasons or technical peculiarities of testing equipment, an additional compression test
was performed with rubber sample under loading velocity of 100 kPa/min.