Quantifying the three-dimensional damage and stress redistribution mechanisms of braided SiC/SiC composites by in situ volumetric digital image correlation

SCRIPTA MATERIALIA

卷:130

Article

Croom, Brendan P.¹  Xu, Peng²  Lahoda, Edward J.³  Deck, Christian P.⁴  Li, Xiaodong¹ 

[1] Univ Virginia, Dept Mech & Aerosp Engn, Room 342,122 Engineers Way, Charlottesville, VA 22904 USA

[2] Westinghouse Elect Corp, 5801 Bluff Rd, Hopkins, SC 29061 USA

[3] Westinghouse Elect Corp, 1000 Westinghouse Dr,Suite 305, Cranberry Township, PA 16066 USA

[4] Gen Atom, POB 85608, San Diego, CA 92186 USA

关键词: Ceramic matrix composites (CMC);    Three-dimensional tomography;    Fracture;    Digital image correlation;   

DOI  :  10.1016/j.scriptamat.2016.12.021

来源: Elsevier

【 摘 要 】

Coupled in situ micro-X-ray computed tomography and volumetric digital image correlation (V-DIC) strain measurements of expanding plug tests revealed the three-dimensional, microstructure-dependent mechanisms behind strain localization, damage initiation and stress redistribution in braided SiC/SiC composites. Hoop strain varied significantly through the composite thickness and was highest at regions of tow crossover; at higher loads, tow fracture initiated at these locations, and sample rupture propagated axially by connecting points of tow overlap. Finally, strain measurements after the failure of a tow on the interior surface quantified the three-dimensional stress redistribution mechanisms and damage tolerance of the SiC/SiC composite. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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