Auxetic Material Design Using Chiral Lattice
Date Issued
2015
Date
2015
Author(s)
Chou, Yen-Chang
Abstract
In this thesis, we designed a structure that can achieve negative Poisson’s ratio (auxeticity). The design rules and procedures were developed. The structure is studied experimentally by compressing a 3D printed specimen. Due to the complex geometry of the structure, compression test of different load direction were performed and anisotropic behavior is observed. Besides compression force and displacement, deformed shape is recorded by camera and the video was analyzed by image measurement software ImageJ. Also, a model was built by finite element software Abaqus 6.12 to compare with experiment. Then we studied the deformation inside the structure by finite element (FE) model because it’s hard to observe the internal deformation in experiment. Next, parametric study was performed by changing material setting and structure geometry in FEM model. The relation between Poisson’s ratio, effective stress, porosity and geometry is investigated. Finally, the possible application and future research are discussed.
Subjects
Negative Poisson’s ratio
Auxetic
3D printing
Finite Element Model
Soft structure
Type
thesis
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ntu-104-R02525020-1.pdf
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