Class
Article
College
College of Engineering
Presentation Type
Poster Presentation
Abstract
This research analyzes an improved high-throughput method for vibration-based fatigue testing. This method builds off previous research by Bruns and Zearley, where a carrier plate assembly containing a test specimen vibrates to failure. In this work, an aluminum carrier plate was designed to load multiple specimens instead of one. This revised design allows multiple specimens to be fatigued simultaneously, reducing total testing time. The assembly designs were simulated in ANSYS to perform parametric modal analysis. The initial three-insert design was chosen such that cyclic stress was concentrated on the specimens rather than the carrier plate, extending the life of the plate for reusability. For experimental testing the assembly was excited using an electrodynamic vibration shaker following the procedures of the Bruns and Zearley assembly. A pair of high-speed cameras in conjunction with stereo digital image correlation (stereo DIC) was used to monitor the mode shape of the assembly during testing. During initial testing the three-insert assembly exhibited the same modal shape as was predicted in simulation. However, continued testing of the three-specimen insert was not completed due to the large accelerations required to generate relatively small strains. The assembly was modified to load two specimens instead, decreasing the acceleration required. Further modal analysis of carrier plates with varying length to width ratios was explored to maximize the number of samples fatigued simultaneously. Additional work is needed to physically validate these simulations.
Start Date
4-8-2020 2:00 PM
End Date
4-8-2020 3:00 PM
Two-Insert Assembly for High-Throughput Vibration-Based Fatigue Testing
This research analyzes an improved high-throughput method for vibration-based fatigue testing. This method builds off previous research by Bruns and Zearley, where a carrier plate assembly containing a test specimen vibrates to failure. In this work, an aluminum carrier plate was designed to load multiple specimens instead of one. This revised design allows multiple specimens to be fatigued simultaneously, reducing total testing time. The assembly designs were simulated in ANSYS to perform parametric modal analysis. The initial three-insert design was chosen such that cyclic stress was concentrated on the specimens rather than the carrier plate, extending the life of the plate for reusability. For experimental testing the assembly was excited using an electrodynamic vibration shaker following the procedures of the Bruns and Zearley assembly. A pair of high-speed cameras in conjunction with stereo digital image correlation (stereo DIC) was used to monitor the mode shape of the assembly during testing. During initial testing the three-insert assembly exhibited the same modal shape as was predicted in simulation. However, continued testing of the three-specimen insert was not completed due to the large accelerations required to generate relatively small strains. The assembly was modified to load two specimens instead, decreasing the acceleration required. Further modal analysis of carrier plates with varying length to width ratios was explored to maximize the number of samples fatigued simultaneously. Additional work is needed to physically validate these simulations.