Semi-Automatic Deflection Measurement Using Digital Image Correlation

dc.contributor.advisorAnbarjafari, Gholamreza, juhendaja
dc.contributor.advisorPunning, Andres, juhendaja
dc.contributor.authorSundla, Siim
dc.contributor.otherTartu Ülikool. Loodus- ja tehnoloogiateaduskondet
dc.contributor.otherTartu Ülikool. Tehnoloogiainstituutet
dc.date.accessioned2016-02-05T08:58:46Z
dc.date.available2016-02-05T08:58:46Z
dc.date.issued2015
dc.description.abstractThe aim of this thesis was to develop an easy-to-use method for providing initial guesses for DIC grid point locations and rotations on objects where major deflection occurs. Study of literature revealed that special approach is required to be able to perform DIC on subsets that are rotated, although such methods exist they are difficult to implement. A method was proposed that employs manual input for creating a curve across image width that describes the specimen deformation. Deflection curve could then be used to provide initial guesses and rotations prior DIC. The approach was implemented using MATLAB and several tests were made to evaluate the algorithm. The results showed that curve based grid transformation can provide sufficient estimation to be able to carry out DIC measurements and converge to sub-pixel accurate solution. The magnitude of displacement error caused by transformation was shown to be irrelevant when search windows are big enough for the correct location to be included. However rotational errors were proven to be significant for sub-pixel accuracy, additional method was proposed and shown to work for compensating errors in rotation estimations. In conclusion the results have shown that the described method can be used for providing initial guesses for grid point locations on deflected objects. Therefore DIC can be used with this approach to carry out deflection measurements.en
dc.identifier.urihttp://hdl.handle.net/10062/50436
dc.language.isoenen
dc.publisherTartu Ülikoolen
dc.subjectDigital Image Correlationen
dc.subject.othermagistritöödet
dc.titleSemi-Automatic Deflection Measurement Using Digital Image Correlationen
dc.title.alternativePoolautomaatne painde mõõtmine kasutades digital image correlation meetoditen
dc.typeThesisen

Files

Original bundle

Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
Sundla_MA2015.pdf
Size:
1.15 MB
Format:
Adobe Portable Document Format
Description:
Magistritöö

License bundle

Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description: