Cover Image

DEVELOPMENT OF AN OPTICAL STRAIN MEASUREMENT METHOD

Strain measurement is important in mechanical testing. There are many strain measurement methods; namely electrical resistance strain gauge, extensometer, Geometric Moiré technique, optical strain measurement method and etc. Each method has its own advantages and disadvantages. There is always a nee...

Full description

Saved in:
Bibliographic Details
Main Author: KHOO , KHOO SZE WEI
Format: Thesis
Language:English
Published: 2011
Online Access:http://utpedia.utp.edu.my/2800/1/MSc_Thesis_Khoo_Sze_Wei_G01094.pdf
http://utpedia.utp.edu.my/2800/
Tags: Add Tag
No Tags, Be the first to tag this record!
id my-utp-utpedia.2800
record_format eprints
spelling my-utp-utpedia.28002017-01-25T09:41:58Z http://utpedia.utp.edu.my/2800/ DEVELOPMENT OF AN OPTICAL STRAIN MEASUREMENT METHOD KHOO , KHOO SZE WEI Strain measurement is important in mechanical testing. There are many strain measurement methods; namely electrical resistance strain gauge, extensometer, Geometric Moiré technique, optical strain measurement method and etc. Each method has its own advantages and disadvantages. There is always a need to develop a precise and yet simple strain measurement method in mechanical testing. The objective of this study is to develop a two-dimensional measurement algorithm that calculates the strain in a loaded structural component. This can be achieved by using the Digital Image Correlation technique which compares the displacement of the random speckles pattern in the reference (undeformed) and the deformed images. In the development of the strain measurement algorithm, it was coded into MATLAB program by using the MATLAB’s Image Processing Toolbox. Next, the tensile tests were conducted where two types of samples made of mild steel and polypropylene materials were tested using the Universal Testing Machine. Simultaneously, videos were recorded using a consumer version of high-definition video camera. The recorded videos (images) were then analyzed and the strain values were determined by using the optical strain measurement method (MATLAB program). In the results and discussions section, the stress-strain curves were plotted for the mild steel and the polypropylene specimens. From the stress-strain curves, the modulus of elasticity of the respective materials was determined and the results determined by the extensometer and the optical strain measurement method were compared to each other. The obtained results had been verified as the modulus of elasticity of the mild steel and the polypropylene specimens were found to be 5.14% and 2.35% off the benchmark values respectively. A good agreement was achieved upon comparison between the results determined by the two methods mentioned above. In conclusion, the two-dimensional deformation measurement algorithm had been successfully developed. 2011-07 Thesis NonPeerReviewed application/pdf en http://utpedia.utp.edu.my/2800/1/MSc_Thesis_Khoo_Sze_Wei_G01094.pdf KHOO , KHOO SZE WEI (2011) DEVELOPMENT OF AN OPTICAL STRAIN MEASUREMENT METHOD. Masters thesis, UNIVERSITI TEKNOLOGI PETRONAS.
institution Universiti Teknologi Petronas
building UTP Resource Centre
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Petronas
content_source UTP Electronic and Digitized Intellectual Asset
url_provider http://utpedia.utp.edu.my/
language English
description Strain measurement is important in mechanical testing. There are many strain measurement methods; namely electrical resistance strain gauge, extensometer, Geometric Moiré technique, optical strain measurement method and etc. Each method has its own advantages and disadvantages. There is always a need to develop a precise and yet simple strain measurement method in mechanical testing. The objective of this study is to develop a two-dimensional measurement algorithm that calculates the strain in a loaded structural component. This can be achieved by using the Digital Image Correlation technique which compares the displacement of the random speckles pattern in the reference (undeformed) and the deformed images. In the development of the strain measurement algorithm, it was coded into MATLAB program by using the MATLAB’s Image Processing Toolbox. Next, the tensile tests were conducted where two types of samples made of mild steel and polypropylene materials were tested using the Universal Testing Machine. Simultaneously, videos were recorded using a consumer version of high-definition video camera. The recorded videos (images) were then analyzed and the strain values were determined by using the optical strain measurement method (MATLAB program). In the results and discussions section, the stress-strain curves were plotted for the mild steel and the polypropylene specimens. From the stress-strain curves, the modulus of elasticity of the respective materials was determined and the results determined by the extensometer and the optical strain measurement method were compared to each other. The obtained results had been verified as the modulus of elasticity of the mild steel and the polypropylene specimens were found to be 5.14% and 2.35% off the benchmark values respectively. A good agreement was achieved upon comparison between the results determined by the two methods mentioned above. In conclusion, the two-dimensional deformation measurement algorithm had been successfully developed.
format Thesis
author KHOO , KHOO SZE WEI
spellingShingle KHOO , KHOO SZE WEI
DEVELOPMENT OF AN OPTICAL STRAIN MEASUREMENT METHOD
author_facet KHOO , KHOO SZE WEI
author_sort KHOO , KHOO SZE WEI
title DEVELOPMENT OF AN OPTICAL STRAIN MEASUREMENT METHOD
title_short DEVELOPMENT OF AN OPTICAL STRAIN MEASUREMENT METHOD
title_full DEVELOPMENT OF AN OPTICAL STRAIN MEASUREMENT METHOD
title_fullStr DEVELOPMENT OF AN OPTICAL STRAIN MEASUREMENT METHOD
title_full_unstemmed DEVELOPMENT OF AN OPTICAL STRAIN MEASUREMENT METHOD
title_sort development of an optical strain measurement method
publishDate 2011
url http://utpedia.utp.edu.my/2800/1/MSc_Thesis_Khoo_Sze_Wei_G01094.pdf
http://utpedia.utp.edu.my/2800/
_version_ 1739830960322510848
score 13.211869

Similar Items