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Crack linkup: An experimental analysis |
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| Authors: | L Ma A S Kobayashi S N Atluri P W Tan |
| Institution: | (1) Structural Integrity Group, United Technology Research Center, 06108 East Hartford, CT;(2) Department of Mechanical Engineering, University of Washington, 98195-2600 Seattle, WA;(3) Center for Aerospace Research and Education, University of California, Los Angeles, 90095-1597 Los Angeles, CA;(4) Atlantic City International Airport, FAA William J. Hughes Technical Center, 08405, NJ |
| Abstract: | TheT ɛ * integral was used to assess stable crack growth and crack linkup in 0.8 mm thick 2024-T3 aluminum tension specimens with multiple site damage (MSD) under monotonic and cyclic loads. TheT ɛ * values were obtained directly from the recorded moiré fringes on the fracture specimens with and without MSD. TheT ɛ * resistance curves of these fracture specimens of different geometries were in excellent agreement with each other. The results suggest thatT ɛ * is a material parameter which can be used to characterize crack growth and linkup in the absence of large overloading.T ɛ * based crack growth and net-section-yield based crack linkup criteria for MSD specimens are proposed. The crack tip opening angle (CTOA) criterion can also be used to correlate crack growth larger than 2 mm. |
| Keywords: | Fracture mechanics moiré interferometry stable crack growth crack linkup multiple site damage (MSD) |
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