Damage Quantification of CMCs by Image Analysis

Boitier, G.; Darzens, S.; Chermant, Liliane; Coster, Michel; Chermant, J.L.

doi:10.1002/3527605622.ch86

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2005

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“…The damage quantification from automatic image analysis has confirmed the continuous opening of the matrix cracks in the transverse cracks during the second stage of creep (Fig. 9) that does not induce much variation to the damage parameter 7,33 …”

Section: Discussionmentioning

confidence: 61%

Advantages of SiC Hi‐Nicalon or NLM 202 Fibers in SiC_f–SiBC Composites

Darzens

Chermant

Sangleboeuf

2005

Journal of the American Ceramic Society

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SiC f -SiBC composites were produced using NLM 202 and Hi-Nicalon SiC f fibers. Tensile creep tests were performed under a reduced pressure of argon. These composites show a good creep resistance at 1473 K with a strain rate ranging from 10 À9 to 10 À7 s À1 , depending on the stress level. The creep strength was improved by using Hi-Nicalon instead of NLM 202 SiC f fibers, to the extent of increasing the loadability by 50 MPa at the same operating temperature or increasing the temperature by 50 K for the same load. The damage observed in SEM micrographs and the use of the damage mechanics provide evidence that creep is governed by a damage-creep mechanism in two steps.

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Section: Discussionmentioning

confidence: 61%