Date of Award

2013

Degree Type

Dissertation

Degree Name

Ph.D.

Department

Civil and Environmental Engineering

First Advisor

Sreekanta Das

Keywords

Applied sciences, Residual stresses, Steel plates, Welding

Rights

CC BY-NC-ND 4.0

Abstract

One of the leading factors of early failure in welded steel structures is caused by the presence of residual stresses. These stresses are caused by the welding process and they can be as high as the yield stress of the material. The residual stresses along with the other service loads experienced by a structure can lead to premature failures. This study was completed to obtain a full understanding of the residual strains and stresses found in various steel plated welded structures. Several factors affecting the welding process were examined such as the welding heat input, the stiffener spacing, the thickness of the parent plate, the termination of a stiffener, and interruption duration during the welding process. The specimens were tested using two test methods. Nine specimens were built and tested and these data were then combined with test data of three specimens tested earlier. Three specimens were tested using the X-Ray diffraction method. Two of the specimens were also simulated using finite element method by using ANSYS. The test results from all three methods of residual stress collection were compared and analyzed. This dissertation presents the residual stress distributions found for all twelve specimens and examines the effects of the various welding factors on the residual stress patterns.

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