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The resistance to crack growth of asbestos cement

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Abstract

The crack resistance of sheet asbestos cement has been characterized in terms of anR-curve which can accomodate effects which often influence the measurement of the critical stress intensity factorK c. The detection and location of the acoustic emission (AE) obtained from the asbestos cement has shown that it originates from microcracks in a zone just in front of the crack. The size of this zone increases to a maximum during slow propagation of the major crack and afterwards remains of constant size during the final crack growth. The form of theR-curve has been explained in terms of the mechanisms of fracture with the aid of AE and fractography studies. An analytical study has related the experimentalR-curve to a theoreticalR-curve and, hence, to the volume fraction, fibre aspect ratio and the strength of the fibre—matrix interface. It has been shown that the microcracking zone can be considered as a theoretical extension, of about one third of the zone length, to the real crack length.

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Authors and Affiliations

  1. Ecole Nationale Supérieure des Mines de Paris, Centre des Matériaux, BP 87 91003, Evry Cédex, France

    J. C. Lenain & A. R. Bunsell

Authors
  1. J. C. Lenain
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  2. A. R. Bunsell
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Lenain, J.C., Bunsell, A.R. The resistance to crack growth of asbestos cement. J Mater Sci 14, 321–332 (1979). https://doi.org/10.1007/BF00589822

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  • DOI: https://doi.org/10.1007/BF00589822

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