CTOA of a stable crack in a thin aluminum fracture specimen |
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| Affiliation: | 1. Structural Integrity Group, United Technology Research Center, East Hartford, CT 06108, USA;2. NASA Ames Research Center, Orbital Sciences Corporation, Moffett Field, CA 94035-1000, USA;3. Fatigue Technology Inc., Seattle, WA 98188-2868, USA;4. Department of Mechanical Engineering, University of Washington, Seattle, WA 98195-2600, USA;1. Department of Mechanical Engineering, Liaoning Shihua University, Fushun 113001, LN, PR China;2. College of Pipeline and Civil Engineering, China University of Petroleum (East China), Qingdao 266000, SD, PR China;1. School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou 221116, China;3. College of Petroleum Engineering, China University of Petroleum, Beijing 102249, China |
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| Abstract: | A crack tip opening angle (CTOA) resistance curve was generated from the moiré interferometry data of thin single edge notched (SEN) and central notched (CN), 2024-T3 aluminum fracture specimens. This CTOA resistance curve, which has a steady state value of 6°, was then used to propagate the cracks in elastic–plastic finite element models of the CN specimen and a CN specimen with a simulated multiple site damage. The CTOA of curved crack growth in a biaxial fracture specimen scattered between 4° and 8° but the resultant crack tip opening displacement, which is the vector sum of the mode-I and the mode-II crack tip sliding displacement, remained a constant 0.18 mm. The CTOA of a rapidly propagating crack in 1.6 mm thick, 7075-T6 SEN specimens increased from 4.5° at a low-crack velocity to a constant 7° at the terminal crack velocity. |
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