In vibration-based fatigue testing, a cantilevered rectangular plate is excited in resonance until failure. This technique has recently been modified to clamp smaller gauge specimens into a larger, reusable carrier plate to reduce material costs. This present work modifies the technique even further by inserting multiple clamped specimens into a shared carrier plate, thus fatiguing multiple specimens in parallel. In the time that it takes one specimen to fail, the other specimens each accumulate the same number of cycles as the failed specimen, thus reducing the remaining time for the other specimens to fail. The failed specimen is then removed and either (a) replaced with a fresh specimen, or (b) is left un-replaced. In the case when specimens are replaced, the amplitude of loading is changed to avoid repeating the same data points. When specimens are not replaced, the mode shape of the overall assembly changes in response to the new geometry. Either way, this means that some specimens accumulate damage at multiple load levels, and thus require a damage accumulation model to assess their net fatigue life. Based on this approach, a mathematical framework is presented to track the damage accumulation in each of the specimens. Fatigue life is assumed to follow Basquin‚Äôs law, while damage accumulation is assumed to follow Miner‚Äôs rule. Using this framework, we demonstrate throughput up to 5.49 times faster compared to testing each specimen individually at the same frequencies.

Damage Accumulation in a Novel High-Throughput Method to Characterize High-Cycle Fatigue

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