Skip navigation
Skip navigation

Investigation on Effects of Geometric Parameters on the Negative Poisson’s Ratio of a Reentrant Structure

Ling, Yiru

Description

It is not common to find negative Poisson’s ratio in nature but it exists in auxetic materials. The auxetic property enables the material to elongate in both vertical and horizontal directions under tension. Cellular honeycombs with repetitive reentrant cells are a common example of auxetics. This thesis investigates the geometric impacts of a reentrant structure originating from honeycombs on the negative Poisson’s ratio of the structure. Finite Element Method is used for the simulation, with...[Show more]

dc.contributor.authorLing, Yiru
dc.date.accessioned2017-06-05T01:09:27Z
dc.identifier.otherb44472869
dc.identifier.urihttp://hdl.handle.net/1885/117205
dc.description.abstractIt is not common to find negative Poisson’s ratio in nature but it exists in auxetic materials. The auxetic property enables the material to elongate in both vertical and horizontal directions under tension. Cellular honeycombs with repetitive reentrant cells are a common example of auxetics. This thesis investigates the geometric impacts of a reentrant structure originating from honeycombs on the negative Poisson’s ratio of the structure. Finite Element Method is used for the simulation, with the commercial software ANSYS APDL 15.0. The negative Poisson’s ratios under different geometric parameters are discussed based on the simulation results with small displacement and linear plane elements. Geometric non-linearity is also taken into consideration for large displacement which occurs in the experiments. Non-linear plane elements are used in the simulation with non-linear geometric deformations. Experimental Poisson’s ratios are collected from tension tests conducted on 3D printed reentrant honeycomb structures, to evaluate the simulation’s accuracy. The simulated results do reflect the same trend in the geometric effects on the negative Poisson’s ratio compared to the corresponding experimental cases, although, there are numerical discrepancies between simulation and experiments. Causes of the differences are analysed. Possible improvements which can be carried out in the future are suggested.
dc.language.isoen
dc.subjectNegative Poisson's ratio
dc.subjectreentrant structure
dc.subjectFEA simulation
dc.subjectgeometric parameters
dc.titleInvestigation on Effects of Geometric Parameters on the Negative Poisson’s Ratio of a Reentrant Structure
dc.typeThesis (MPhil)
local.contributor.supervisorQin, Qinghua
local.contributor.supervisorcontactqinghua.qin@anu.edu.au
dcterms.valid2017
local.description.notesthe author deposited 5/06/2017
local.type.degreeMaster of Philosophy (MPhil)
dc.date.issued2017
local.contributor.affiliationCollege of Engineering and Computer Science, The Australian National University
local.identifier.doi10.25911/5d70f3eb0d5de
dc.provenance6.2.2020 - Made open access after no response to emails re: extending restriction.
local.mintdoimint
CollectionsOpen Access Theses

Download

File Description SizeFormat Image
Ling Thesis 2017.pdf3.39 MBAdobe PDFThumbnail


Items in Open Research are protected by copyright, with all rights reserved, unless otherwise indicated.

Updated:  19 May 2020/ Responsible Officer:  University Librarian/ Page Contact:  Library Systems & Web Coordinator