Correlation of Stress Intensity Range with Deviation of the Crack Front from the Primary Crack Plane in both Hand and Die Forged Aluminum 7085-T7452
Date of Award
M.S. in Mechanical Engineering
Department of Mechanical and Aerospace Engineering and Renewable and Clean Energy
Advisor: David Myszka
Experimental study accomplished the characterization of fatigue crack growth rates and mechanisms in both hand and die forged Aluminum 7085-T7452. Testing was conducted at various positive and negative loading ratios, primarily focused on L-S and T-S orientations to discover a correlation between crack tip branching or turning mechanisms and stress intensity. Interior delaminations were found to originate in the interior of the specimen and propagate outward to the surface and manifested as splitting cracks parallel to the loading direction. Stress intensity ranges have been correlated with the onset of crack deviation from the primary crack plane, as well as, the transition to branching dominated fatigue crack growth.
Aerospace Materials, Engineering, Mechanical Engineering, Materials Science, Al 7085-T7452, Al 7085, aluminum alloys, crack branching, delamination, crack arrest, crack splitting, crack delamination, L-S, T-S, fatigue, fatigue crack growth, fracture mechanics, crack deviation, aerospace structures, fracture mechanisms, branching
Copyright 2019, author
Neely, Jared A., "Correlation of Stress Intensity Range with Deviation of the Crack Front from the Primary Crack Plane in both Hand and Die Forged Aluminum 7085-T7452" (2019). Graduate Theses and Dissertations. 6733.