Award Date

1-1-2004

Degree Type

Thesis

Degree Name

Master of Science (MS)

Department

Mechanical Engineering

First Committee Member

Ajit K. Roy

Number of Pages

58

Abstract

Recent approaches to residual stress measurements in transmutation target structural materials using destructive and nondestructive techniques have been investigated in this research project. A major emphasis has been placed on the use of the Neutron Diffraction (ND) technique to determine the residual stresses in austenitic and martensitic stainless steels subjected to plastic deformation and welding operations. The resultant data have been compared to those obtained by other techniques including positron annihilation spectroscopy, x-ray diffraction and ring-core methods. Cold-worked (CW), three-point-bent (TPB) and welded specimens of similar and dissimilar materials were tested. ND measurements on CW specimens showed enhanced residual stresses with increased cold reduction. The welded specimens revealed maximum stresses at the fusion line followed by reduction in stress at locations away from it. Characterization of residual stresses in the TPB specimens showed compressive stresses at the convex surface followed by tensile residual stresses at greater depths. Comparative analyses of residual stresses by different techniques showed consistent stress patterns. Microstructural evaluations by optical microscopy revealed the metallurgical phases, as expected.

Keywords

Analysis; Comparative; Materials; Residual; Stresses; Sub; System; Target

Controlled Subject

Mechanical engineering; Materials science

File Format

pdf

File Size

2570.24 KB

Degree Grantor

University of Nevada, Las Vegas

Language

English

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