College - Author 1
College of Engineering
Department - Author 1
Biomedical Engineering Department
Advisor
Masoud Yekanifard, College of Engineering, Mechanical Engineering Department
Funding Source
Cal Poly's Academic Affairs Office
Date
10-2025
Abstract/Summary
Auxetic metamaterials are a category of material that exhibit a negative Poisson's ratio (NPR). NPR materials contract when compressed and expand when stretched. NPR properties are typically produced through a complex unit cell consisting of folds, internal angles, or other specially designed shapes with internal voids capable of collapsing in on themselves. Individual unit cells that display these properties are developed and stacked or layered in a repeating pattern such that a larger body can be manufactured, maintaining the same properties. NPR auxetic structures show either a stretch-dominated mechanism (SDM) or a bending-dominated mechanism (BDM). SDM-based NPR structures are favored for high stiffness-to-weight ratio but lack high energy absorption capability. BDM-based structures have the advantage of high energy absorption and the disadvantage of low stiffness. This SURP project will focus on developing a novel SDM-BDM auxetic metamaterial with high stiffness and enhanced energy absorption. Students will learn the numerical analysis technique ANSYS and study the behavior of the newly invented material using ANSYS. The new metamaterial has vast implications in support structures and energy dissipation systems in defense, aerospace, and biomedical fields.
October 1, 2025.
URL: https://digitalcommons.calpoly.edu/ceng_surp/122