Sponsor
Portland State University. Department of Engineering and Applied Science
First Advisor
Wendelin H. Mueller, III
Term of Graduation
Fall 1977
Date of Publication
12-14-1977
Document Type
Thesis
Degree Name
Master of Science (M.S.) in Applied Science
Language
English
Subjects
Drilling and boring, Residual stresses, Steel tubes
DOI
10.15760/etd.2571
Physical Description
1 online resource (xiii, 166 pages)
Abstract
Among semi-destructive methods of measuring residual stresses in elastic materials, the blind hole-drilling strain-gage method is one of the best because it is simple, economical and accurate. It is based on the measurement of strains disturbed by machining a small diameter shallow hole in the test piece. The strains measured in three known directions permit the determination of the direction and magnitude of principal stresses and subsequently of any stress in any direction.
This thesis presents the investigation of residual stresses in the longitudinal direction of a welded fabricated steel tube of 22 inch diameter, relating to a series of holes drilled in one half of a circular section of the tube. An initial assumption, substantiated later, was the existence of a uniform field of residual stresses through the thickness of the tube. Several methods for determining calibration coefficients are documented. The values of longitudinal stresses once computed are presented in a smooth curve. A straight line approximation is recommended for use in further studies of the effects of residual stresses on failure loads.
Rights
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Persistent Identifier
https://archives.pdx.edu/ds/psu/16223
Recommended Citation
Tran, Chau Mong, "An Experimental Investigation of the Hole-Drilling Technique for Measuring Residual Stresses in Welded Fabricated Steel Tubes" (1977). Dissertations and Theses. Paper 2574.
https://doi.org/10.15760/etd.2571
Comments
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