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Acoustic Emissions During Indentation Tests

Published online by Cambridge University Press:  22 February 2011

T P Weihs ,
C W Lawrence ,
B Derby ,
C B Scruby  and
J B Pethica
T P Weihs
Affiliation:
Department of Materials, Parks Rd, Oxford, OX1 3PH, UK
C W Lawrence
Affiliation:
Department of Materials, Parks Rd, Oxford, OX1 3PH, UK
B Derby
Affiliation:
Department of Materials, Parks Rd, Oxford, OX1 3PH, UK
C B Scruby
Affiliation:
also at National NDT Centre, AEA Technology, Harwell Laboratory, UK
J B Pethica
Affiliation:
Department of Materials, Parks Rd, Oxford, OX1 3PH, UK
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Abstract

When a hard tip indents a sample, cracking, delamination and plasticity can all produce acoustic signals in the form of elastic waves. This paper describes how these acoustic emissions (AE) can be monitored using piezoelectric elements and a load-controlled indentation instrument. Signals emitted from thin films and bulk materials are shown and they are correlated with distinct jumps in displacement of the indenter tip. The benefits and difficulties of different methods of monitoring the emissions are also considered.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 239: Symposium D – Thin Films: Stresses and Mechanical Properties III , 1991 , 361
Copyright
Copyright © Materials Research Society 1992

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References

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