Experimental Analysis of Auxetic Structures with Different Cell Parameters under Uniaxial Compression

Abstract

The structures at varying operating conditions are exposed to loads that can lead to damage. One of the structural loads that cause damage is compression load. However, such loading causes different effects on auxetic structures having the negative Poisson's ratio. Since these structures contract under compressive loads, they exhibit higher indentation resistance than conventional cellular structures. In this study, the effects of changing the ligament length and ligament angle in auxetic re-entrant structures under uniaxial compressive loading were experimentally investigated. The auxetic re-entrant structures were fabricated from PLA material by a three-dimensional printer using fused deposition method. The tests were performed under quasi-static uniaxial compression load and the test was continued until the indentation point. As a result of the tests, shrinkage of the cross-section was observed, and it was revealed that there is an inverse relationship between the ligament length and the maximum compressive load. In addition, it was clearly observed that the maximum compression load increased as the angle increased for the maximum ligament length.