Auxetic materials have a negative Poisson's ratio
when stretched becoming thicker in a direction perpendicular to the direction of the applied force.
The observations of Dzegniuk (1970) and Sroka (1973) regarding the [mu] factor value we can infer that the corresponding range of values of the Poisson's ratio
In these tests, it can be observed that the viscous Poisson's ratio
increases in compression, but remains virtually constant in tension.
The matrix will be assumed as an elastic material: Young's modulus [E.sub.M] =10 MPa and Poisson's ratio
[v.sub.M] = 0.495.
Figure 5 shows the effect of the changes in Poisson's ratio
[v.sup.s], on the radial displacement and the amplitude of the circumferential stress.
 believed that the plastic zone has a close relationship with Poisson's ratio
of rock mass.
Evidently, the domain of definition of any single-valued continuous function that can be selected to approach the Poisson's ratio
of this intermediate phase between fiber and matrix is the interval [[r.sub.f], [r.sub.i].
Based on strain measurements of the composites, Poisson's ratio
of the composites was calculated.
Limits to Poisson's ratio
in isotropic materials--general result for arbitrary deformation.
These elastic constants include the Poisson's ratio
, which characterizes the resultant strain in the y-direction for a material under longitudinal deformation in the x-direction.
Materialization of specimens possessing Poisson's ratio
was implemented by performing three-axial compression with heat treatment.
As we all know, the stress is independent from Young's modulus E and Poisson's ratio
v for SS model.