Development and evaluation of sub-element testing of SiC/SiC ceramic matrix composites at elevated temperatures. Issue 5 (May 2021)

• Record Type: Journal Article
• Authors: Gale, L.; Harris, S.; Pattison, S.; Baker, J.; Fowler, J.
• Is Part Of: Journal of the European Ceramic Society. Volume 41:Issue 5(2021)
• Page Start: 3167
• Page End: 3176
• Publication Date: 2021-05
• Subjects: Ceramic matrix composite -- Sub-Element -- Fatigue -- Digital image correlation; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2020.07.038
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: SiC/SiC ceramic matrix composites (CMCs) are being developed for use in aero-engines to replace nickel superalloy components. Sub-element testing acts as the key stepping stone in bridging understanding derived from basic coupon testing and more complex component testing. This study presents the development of high temperature C-shape sub-element testing with the use of digital image correlation to study damage progression. The specimen is designed with a bias towards a mixed mode-stress state more similar to what a CMC component may see in service. Both monotonic and fatigue tests were completed on C specimens and compared with predicted behaviour from modelling. Test data from both test types suggested that specimens were failing once they reached a critical radial stress level. However evidence from fractography of specimens showed that in both monotonic and fatigue tests radial cracks (driven by hoop stresses) are initiating prior to circumferential cracks.