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A New Approach of DIC on the 3-D Deformation Measurement

In this study, a simple and inexpensive membrane mechanical property measuring system was developed. By applying the force on a membrane and recording the corresponding out-of-plane displacement fields, then the Young¡¦s modules and Possion¡¦s ratio of the membrane can be obtained from those deformations through the inverse approach. Firstly, a loading frame was designed to fix the membrane and allow the membrane can be loaded and its deformations can be measured precisely. In order to measure the out-of-plane displacement fields of the loaded membrane, the digital image correlation (DIC) was used and an easier 3-D DIC measuring method was proposed in this study. The proposed 3-D DIC measuring method was verified by using a loaded cantilever beam with ESPI. The error was within in 10%. In this study, the smallest in-plane displacement that can be measured by proposed method is 2 £gm and the smallest out-of-plane displacement that that can be measured is 6£gm.
In this study, in order to determine the mechanical properties of the membrane, digital image correlation, finite element method (FEM) and optimization method were combined with the measured out-of-plane displacement fields, then the Young¡¦s modules and Possion¡¦s ratio of the membrane were determined through the inverse approach. The FEM simulations were performed by using ANSYS. Several optimization theorems were adopted and their corresponding merits on this study were compared The obtained Young's modulus was compared with the results obtain from the nano-indentor and the error was within in 3% ~ 12%.
Keyword: digital image correlation, membrane, Young¡¦s modules, Possion¡¦s ratio, finite element method, optimization method.

Identiferoai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0716109-185504
Date16 July 2009
CreatorsWu, Jia-sheng
ContributorsYoung-Chang Chen, Yii-der Wu, Jung-Hung Sun, Shiau-ting Nung, Chi-Hui Chien
PublisherNSYSU
Source SetsNSYSU Electronic Thesis and Dissertation Archive
LanguageCholon
Detected LanguageEnglish
Typetext
Formatapplication/pdf
Sourcehttp://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0716109-185504
Rightsnot_available, Copyright information available at source archive

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