Measurement of structural stresses using hole drilling
department or school: Applied Science, Faculty of
department or school: Mechanical Engineering, Department of
data provider: DSpace
degree campus: UBCV
creator: Harrington, Joshua S.
issued: 2015-10-24T07:28:27
issued: 2015
related degree: Master of Applied Science - MASc
degree grantor: University of British Columbia
description: From a measurement standpoint structural stresses can be divided into two broad categories: stresses that can be measured straightforwardly by adjusting loads, e.g., live loads on a bridge, and those that are much more difficult, e.g., gravitational loads and loads due to static indeterminacy. This research focuses on the development of a method that combines the hole-drilling technique, a method used to measure residual stresses, and digital image correlation (DIC), an optical method for determining displacements, to measure these difficult-to-measure structural stresses. The hole-drilling technique works by relating local displacements caused by the removal of a small amount of stressed material to the material stresses. Adapting the hole-drilling technique to measure structural stresses requires scaling the hole size and modifying the calculation approach to measure deeper into a material. DIC is a robust means to measure full-field displacements and unlike other methods used to measure hole-drilling displacements, can easily be scaled to different hole sizes and corrected for measurement artifacts. There are three primary areas of investigation: the modification of the calculation method to account for the finite thickness of structural members, understanding the capabilities and limitations of DIC for measuring hole-drilling displacements, and evaluating the effects hole cutting has on the measurement. Experimental measurements are made to validate the measurement method as well as apply it to the real world problem of measuring thermally induced stresses in railroad tracks.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/55049
note: Measurement of Structural Stresses Using Hole DrillingbyJoshua S. HarringtonB.S. Mechanical Engineering, California Polytechnic University of San Luis Obispo, 2009a thesis submitted in partial fulfillmentof the requirements for the degree ofMaster of Applied Scienceinthe faculty of graduate and postdoctorial studies(Mechanical Engineerng)The University of British Columbia(Vancouver)October 2015© Joshua S. Harrington, 2015AbstractFrom a measurement standpoint structural stresses can be divided into two broad categories:stresses that can be measured straightforwardly by adjusting loads, e.g., live loads on a bridge,and those that are much more difficult, e.g., gravitational loads and loads due to static indeter-minacy. This research focuses on the development of a method that combines the hole-drillingtechnique, a method used to measure residual stresses, and digital image correlation (DIC), anoptical method for determining displacements, to measure these difficult-to-measure structuralstresses. The hole-drilling technique works by relating local displacements caused by the re-moval of a small amount of stressed material to the material stresses. Adapting the hole-drillingtechnique to measure structural stresses requires scaling the hole size and modifying the calcu-lation approach to measure deeper into a material. DIC is a robust means to measure full-fielddisplacements and unlike other methods used to measure hole-drilling displacements, can eas-ily be scaled to different hole sizes and corrected for measurement artifacts. There are threeprimary areas of investigation: the modification of the calculation method to account for thefinite thickness of structural members, understanding the capabilities and limitations of DICfor measuring hole-drilling displacements, and evaluating the effects hole cutting has on themeasurement. Experimental measurements are made to validate the measurement method aswell as apply it to the real world problem of measuring thermally induc…
has type: Thesis/Dissertation
date issued: 2015-11
is shown at: 10.14288/1.0166775
language: eng
degree discipline: Mechanical Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NoDerivs 2.5 Canada
rights URI: http://creativecommons.org/licenses/by-nd/2.5/ca/
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/55049