An experimental test of the critical behaviour of fracture precursors |
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Authors: | A Guarino A Garcimartín S Ciliberto |
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Institution: | (1) Laboratoire de Physique, école Normale Supérieure de Lyon, 46 allée d'Italie, 69364 Lyon Cedex 07, France, FR |
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Abstract: | The statistical properties and the localization of fracture precursors on heteregeneous materials is studied by recording
their acoustic emission as a function of the applied load. It's found that the microcrack cluster together as the load increases
and the instantaneous acoustic energy has an invariant power law distribution. The integrated acoustic energy presents a critical
divergency close to the failure load for the sample. These result support the idea that fracture can be viewed as a critical
phenomenon. Finally a measure of the concentration of microcraks, which allows us to predict the failure load, is introduced.
These properties are studied also when a periodic load is applied to the sample. It's found that the Kaiser effect is not
strictly satisfied in heteregeneous materials.
Received: 23 January 1998 / Revised: 20 April 1998 / Accepted: 17 June 1998 |
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Keywords: | PACS 62 20 Mk Fatigue brittleness fracture and cracks - 46 30 Nz Fracture mechanics fatigue and cracks - 81 40 Np Fatigue corrosion fatigue embrittlement cracking fracture and failure |
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