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Experimental Mechanics

, Volume 48, Issue 1, pp 133–137 | Cite as

The Use of Acoustic Emission Monitoring to Rank Paper Materials with Respect to Their Fracture Toughness

  • P. A. Gradin
  • D. Graham
  • P. Nygård
  • H. Vallen
BRIEF TECHNICAL NOTE

Abstract

In this study, a simplified Acoustic Emission (AE) equipment, in essence an AE signal conditioner and a USB (Universal Serial Bus) data acquisition system, is used to study what happens in paper structures during mechanical loading. By the use of such equipment, some parameters that can be extracted are e.g. the stress and strain at onset of AE, the stress and strain at the onset of rapid AE defined as some numerical factor (larger then one) times the initial emission rate, the emission rate at the first stage of loading and the stress and strain at final failure i.e. when the specimen loses its load carrying ability.In this study however, the interest is focused on one particular parameter i.e. the elastic strain energy density W c at onset of AE. This is a parameter with a clear physical meaning and in this study, the correlation between this parameter and a fracture toughness measure, is investigated.The conclusion is that when nine different paper materials (with a large span regarding properties) are considered, there is a correlation (however not linear) between these two parameters.

Keywords

Acoustic emission Damage mechanics Fracture toughness Bond failure J-integral 

Notes

Acknowledgement

The financial support from the European Commissions 5th frame program under contract No QLK%-CT-2002-00772 is greatly acknowledged.

References

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Copyright information

© Society for Experimental Mechanics 2007

Authors and Affiliations

  • P. A. Gradin
    • 1
  • D. Graham
    • 2
  • P. Nygård
    • 3
  • H. Vallen
    • 4
  1. 1.Mid Sweden UniversitySundsvallSweden
  2. 2.School of Computing and Mathematical SciencesUniversity of GreenwichLondonUK
  3. 3.Paper and Fibre Research InstituteTrondheimNorway
  4. 4.Vallen-Systeme GmbHIckingGermany

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