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Acoustic Emission Sensors for NDC of Carbon/Carbon

  • B. R. Tittmann

Abstract

This report demonstrates how acoustic sensors can monitor changes in microstructure during the pyrolysis of Carbon/Carbon. In particular, we have demonstrated on flat plates up to one foot square in size that Acoustic Emissions (AE) are significantly different between normal microcracking associated with the chemo/physical changes during pyrolysis and the catastrophic delaminations that occur if the processing temperature/time treatment is incorrect. About 30 experimental runs have now been carried out, which show that AE provide precursor information in advance of delaminations so that the potential exists for making corrective changes during the processing treatment.

Keywords

Acoustic Emission Stress Drop Acoustic Emission Event Acoustic Sensor Acoustic Emission Activity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1991

Authors and Affiliations

  • B. R. Tittmann
    • 1
  1. 1.Penn State UniversityUniversity ParkUSA

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