Monitoring drilling of advanced composites, drill wear, and exit hole delamination using wave-based acoustic emission

Anthony Chukwujekwu Okafor; Scott R. Birdsong

doi:10.1117/12.339964

4 February 1999 Monitoring drilling of advanced composites, drill wear, and exit hole delamination using wave-based acoustic emission

Anthony Chukwujekwu Okafor, Scott R. Birdsong

Author Affiliations +

Proceedings Volume 3589, Process Control and Sensors for Manufacturing II; (1999) https://doi.org/10.1117/12.339964
Event: Nondestructive Evaluation Techniques for Aging Infrastructures and Manufacturing, 1999, Newport Beach, CA, United States

Abstract

An experimental investigation was performed to study drill wear and its effect on acoustic emission and drilled hole exit delamination for both carbide and PCD drills when drilling in advanced composites (AS4/PEEK). Drilling conditions were selected to minimize exit hole delamination for the carbide drill and a series on 80 holes were drilled with both carbide and PCD drills. Acoustic emission signals were acquired and flank wear width were measured after every fifth hole. Carbide drill material was found to wear more than the PCD drill. Exit hole delamination increases with tool wear for both carbide and PCD drills as shown from measurements and SEM micrograph images of drilled holes. The average acoustic emission (AE) energy per event as well as total AE energy were found to decrease with tool wear. The results show that acoustic emission could be used successfully for real-time monitoring and prediction of drill wear and exit hole delamination.

Citation Download Citation

Anthony Chukwujekwu Okafor and Scott R. Birdsong "Monitoring drilling of advanced composites, drill wear, and exit hole delamination using wave-based acoustic emission", Proc. SPIE 3589, Process Control and Sensors for Manufacturing II, (4 February 1999); https://doi.org/10.1117/12.339964

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