Date of Award
Spring 1978
Document Type
Thesis
Department
Mechanical & Aerospace Engineering
Program/Concentration
Mechanical Engineering
Committee Director
S. G. Cupschalk
Committee Member
M. W. Hyer
Committee Member
R. M. Sundaram
Call Number for Print
Special Collections; LD4331.E56K95
Abstract
X-ray observations of fatigue fracture and deformed surfaces of 7075-T6 aluminum were conducted in this study. The (111) and (222) diffraction peaks were obtained from the fractured and deformed surfaces. It was observed that in comparison with the base metal, the fracture exhibited line broadening similar to that due to cold working. The broadening is indicative of plastic deformation in the vicinity of the advancing crack tip during the fracture process. Also the different regions of fracture exhibited varying degrees of line broadening. With respect to the fatigue crack, the slow crack growth region showed a greater broadening, and, hence, a smaller particle size, than the fast crack growth region. By means of a modified residual stress device, it was determined that the depth of x-ray penetration did not exceed the thickness of the deformed material at the fracture surface. From an analysis of fracture and deformed surfaces, roughness of the fracture surface was not observed to affect the shapes of x-ray diffraction peaks.
Rights
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DOI
10.25777/9spk-nx74
Recommended Citation
Kumar, Tamma K..
"Studies of Fracture and Deformed Surfaces of High Strength Aluminum Alloys by X-Ray Diffraction"
(1978). Thesis, Old Dominion University, DOI: 10.25777/9spk-nx74
https://digitalcommons.odu.edu/mae_etds/574
Included in
Engineering Mechanics Commons, Mechanics of Materials Commons, Structural Materials Commons