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Conference proceeding
Damage Precursor Indicator for Aluminum 7075-T6 Based on Nonlinear Dynamics
NONLINEAR DYNAMICS, VOL 1, v 1, pp 303-313
01 Jan 2019
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Abstract
In this work, a damage precursor indicator for aluminum 7075-T6 is proposed based on the nonlinear dynamics of a cantilevered beam system. A shouldered beam specimen is used to move the region of highest stress away from the clamped end. The beam is subject to harmonic base excitation in a uniaxial shaker. Fatigue damage accumulates in the beam with damage forming most quickly in the region of highest stress. By monitoring the tip deflection, changes in the natural frequency and response to a given excitation are correlated to fatigue life. Despite the absence of large-scale cracks, detectable changes in the nonlinear dynamics are discovered. The nonlinear dynamic parameters are estimated capturing the change in the forward and backward nonlinear sine sweeps. These changes could lend themselves to being a trackable damage precursor. The presence of microstructural precursors are confirmed using nanoindentation.
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Details
- Title
- Damage Precursor Indicator for Aluminum 7075-T6 Based on Nonlinear Dynamics
- Creators
- Robert A. Haynes - CECOM Software Engineering CenterEd Habtour - US Army, Res Lab, Aberdeen, MD 21005 USATodd C. Henry - CECOM Software Engineering CenterDaniel P. Cole - CECOM Software Engineering CenterVolker Weiss - CECOM Software Engineering CenterAntonios Kontsos - Drexel UniversityBrian Wisner - Drexel University
- Contributors
- G Kerschen (Editor)
- Publication Details
- NONLINEAR DYNAMICS, VOL 1, v 1, pp 303-313
- Series
- Conference Proceedings of the Society for Experimental Mechanics Series
- Publisher
- Springer Nature
- Number of pages
- 11
- Resource Type
- Conference proceeding
- Language
- English
- Academic Unit
- Mechanical Engineering and Mechanics
- Web of Science ID
- WOS:000558225600027
- Scopus ID
- 2-s2.0-85060376460
- Other Identifier
- 991019168319204721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Engineering, Mechanical