Dataset on fractographic analysis of various SiC-based fibers

This data article reports a systematic fractographic analysis of SiC-based filaments aiming at stress intensity factors assessment. A total of 11 fiber types (as-received or chlorinated Nicalon (R) and Tyranno (R) of all three generations) where therefore repeatedly tensile tested to generate the fracture surfaces. The tensile strengths were found to be independent to defect location (surface or internal). The wellknown linear square root dependence of strength on mirror, mist or hackle outer radius was reaffirmed. These measurements reveal some residual tensile stresses on Nicalon (R) fibers, statement however questioned by the broad data scattering. Moreover, it is shown the surface etching treatment didn't affected (generating or releasing) such residual stress. A null y -intercept was consequently adopted to assess the characteristic stress intensity factors (K-IC, mirror, mist or hackle constants). The toughness (K-IC) estimated this way ranges from 1.0 to 1.9 MPa m(1/2) and shows a clear dependency to substrate composition: higher values were extracted on oxygen-free fibers. The A(m)/K-IC ratio, estimated to equal 1.8 and independent to substrate type, is a key parameter that would assist further fractographic investigations. (c) 2020 Published by Elsevier Inc. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)