Title page for ETD etd-05152000-13410027

Type of Document Master's Thesis
Author Gloss, Kevin T
URN etd-05152000-13410027
Title A Photoelastic Investigation into the Effects of Cracks and Boundary Conditions on Stress Intensity Factors in Bonded Specimens
Degree Master of Engineering
Department Engineering Mechanics
Advisory Committee
Advisor Name Title
Smith, Charles W. Committee Chair
Constantinescu, D. Committee Member
Dowling, Norman E. Committee Member
  • Photoelasticity
  • Crack
  • Bondline
  • Stress Intensity Factor
  • Interface
Date of Defense 2000-05-08
Availability unrestricted
An investigation into the influence of cracks in bonded specimens is conducted.

Photoelastic specimens containing a bondline are subjected to a constant displacement

boundary condition created by bonded end grips. Specimens containing various crack

orientations are analyzed to determine stress intensity factors at the induced crack tips.

Specimens containing interface and sub-interface cracks were investigated. Two global

geometries were used in this investigation, square and rectangular. The constant

displacement boundary condition was induced on the specimen through dead weights

hung from bonded aluminum end grips. Stress intensity factors were determined using

photoelastic techniques. The stress intensity factors were examined to determine trends

in the results as a function of changes in geometry. The effects of the induced boundary

condition, the specimen geometry, and the bondline were investigated. The results from

this investigation were compared to known solutions with a similar specimen geometry.

These tests exhibited influences from the bondline, the boundary conditions, and the

specimen geometry. The bondline tended to decrease the stress intensity factor for

specimens with small crack lengths and tended to increase the stress intensity factor for

specimens containing long crack lengths. As the crack length increased so too did the

stress intensity factor. A reduction in the bondline to crack distance with sub-interface

crack specimens caused a reduction in the stress intensity factor. A reduction in the

global height of the specimen caused a reduction in the stress intensity factor also. The

results from this investigation will aid in the understanding of the influence of interface

and sub-interface cracks in bonded specimens.

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