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

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• 作者：Brendan P. Croom^a ; Peng Xu^b ; Edward J. Lahoda^c ; Christian P. Deck^d ; Xiaodong Li^a ; ^{xl3p@virginia.edu}
• 关键词：Ceramic matrix composites (CMC) ; Three-dimensional tomography ; Fracture ; Digital image correlation
• 刊名：Scripta Materialia
• 出版年：2017
• 出版时间：15 March 2017
• 年：2017
• 卷：130
• 期：Complete
• 页码：238-241
• 全文大小：905 K
• 卷排序：130

文摘

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.