Running Head: POISSON’S RATIO OF ARTICULAR CARTILAGE
Poisson’s ratio of articular cartilage:
POISSON’S RATIO OF ARTICULAR CARTILAGE
Cartilage is a layered tissue which is softer and a little more flexible than bone. It is non-uniform
and takes the direction or shape of the bone. For mathematical research, collagen is usually modelled as a
similar tissue to ease the computational process. Indentation has used in a test the matrix, and its malleable
nature makes it be considered as more relevant to the physiological condition. Collagen supply's tissue with
resistance to malleable loading, contributing to anisotropic effects which are evident as a contingency of
soft behavior on positioning concerning the structure of collagen. The biphasic theory has been used once
and again in the analysis of confined compression behavior of collagen (Frank, & Grodzinsky,1987; Mow
et al., 1980).
However, the unconfined configuration method was not successful. The differences were due to
the challenges that are associated with experimenting. Some of these challenges included, the material used
for one test configuration could not be useful for other tests, and also some of the samples were too small
to be tested by any other methods other than indentation. The biphasic technique has been utilized to extort
all the real variables of the model, through a one indenture measurement. The small Poisson's ratio values
have been verified by using direct analysis in a free compression that will result in a higher young modulus
when compared to that of the unfree compression.
In this research, we introduce a technique of establishing the Poisson’s ratio derived from visual
and automated analyses of soft materials using indentation. This is achieved by recording the visual changes
of the collagen in free geometry and also measuring the stress relaxation in unfree and free compression.