Development of a Closed-Loop High-Cycle Resonant Fatigue Testing System |
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Authors: | Email author" target="_blank">G?J?YunEmail author A?B?M?Abdullah W?Binienda |
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Institution: | (1) Department of Civil Engineering, The University of Akron, 244 Sumner St. ASEC 209F, Akron, OH 44325–3905, USA |
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Abstract: | In this paper, a vibration-based testing methodology to assess fatigue behavior of a metallic structure is presented. To minimize
the testing duration, the test setup is designed for a base-excited multiple-specimen arrangement driven in a high-frequency
resonant mode, which allows completion of fatigue testing in an accelerated period. The shaker operates in closed-loop control
with dynamic specimen response feedback provided by a scanning laser vibrometer. A test coordinator function is developed
to synchronize the shaker controller and the laser vibrometer and complete the closed-loop scheme: the test coordinator monitors
structural health of the test specimens throughout the test period, recognizes change in specimen dynamic behavior due to
fatigue crack initiation, terminates test progression, and acquires test data in an orderly manner. The test methodology is
demonstrated with cantilever specimens that are clasped on the shaker armature with specially-designed clamp fixtures. Experimental
stress evaluation is carried out to verify the specimen stress predictions. A successful application of the experimental methodology
is demonstrated by validation tests with Al 6061-T6 aluminum specimens subjected to fully-reversed bending stress. |
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