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Time-Frequency Analyzing of Acoustic Emission Signals in Drilling of Glass/Epoxy Composites

[+] Author Affiliations
Hossein Heidary, Navid Zarif Karimi, Mehdi Ahmadi Najafabadi

Amirkabir University of Technology, Tehran, Iran

Giangiacomo Minak, Andrea Zucchelli

University of Bologna, Bologna, Italy

Paper No. ESDA2012-82670, pp. 69-74; 6 pages
doi:10.1115/ESDA2012-82670
From:
  • ASME 2012 11th Biennial Conference on Engineering Systems Design and Analysis
  • Volume 3: Advanced Composite Materials and Processing; Robotics; Information Management and PLM; Design Engineering
  • Nantes, France, July 2–4, 2012
  • Conference Sponsors: International
  • ISBN: 978-0-7918-4486-1
  • Copyright © 2012 by ASME

abstract

Drilling is a dynamic process which causes some defects in composite materials such as delamination, fiber pull out and matrix cracking. Because of non-stationary behavior of drilling process, using online method to monitor these damage mechanisms is inevitable. In this paper, acoustic emission signals and wavelet analysis are applied to monitor drilling action from entry to exit. The results show that the selected monitoring indices from the time domain parameters and wavelet packet coefficients are capable of detecting the drilling stages and damage mechanisms during the process effectively.

Copyright © 2012 by ASME

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