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Multiple cracking of a coating layer and its influence on fibre strength

✍ Scribed by S. Ochiai; M. Hojo

Publisher: Springer
Year: 1995
Tongue: English
Weight: 513 KB
Volume: 30
Category: Article
ISSN: 0022-2461
DOI: 10.1007/bf00352162

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✦ Synopsis

A calculation method to describe the influence of the non-uniform crack-spacing in a strongly adhering coating layer, which shows multiple cracking, on the energy release rate of a coated fibre is presented and applied to some examples. Four main results were found. The energy release rate of the fibre at the crack in the region of narrow crack-spacing was low. For any crack-spacing, the energy release rate was high when the Young's modulus of the fibre was low and that of the coating layer was high. From the calculation of energy release rates of the fibre at all cracks, the strength-determining crack could be identified, and from this the fibre strength after multiple cracking of the coating layer could be estimated. Finally, the strength of the fibre for non-uniform crack spacing was lower than that for a uniform one.

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