Date of Award


Document Type



Santa Clara : Santa Clara University, 2018.

Degree Name

Master of Science (MS)


Mechanical Engineering

First Advisor

Michael Taylor


It has been known that when introducing alternating elliptical extrusions in a solid material with a positive Poisson's Ratio, the material's effective Poisson's Ratio can become negative. Furthermore, the change in the effective Poisson's ratio depends on two factors: the elliptical extrusions' aspect ratio and the porosity. Using this phenomenon, a study is conducted by combining elliptical extrusions with different aspect ratios and porosity to construct a composite material with gradually varying Poisson's Ratio. Numerical and physical compression studies are conducted to characterize the material's effective properties. The results show that the material can effectively stabilize its own structure under unilateral loading and spread out reaction forces. These characteristics make graduating Poisson's Ratio materials good candidates for impact absorption applications. A brief look at a 3-dimensional auxetic structure is also conducted. A parametric modeling tool for the 3-dimensional structure is created.