Development and evaluation of sub-element testing of SiC/SiC ceramic matrix composites at elevated temperatures |
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Authors: | L Gale S Harris S Pattison J Baker J Fowler |
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Affiliation: | 1. Rolls-Royce Plc, P.O Box 31, Derby, DE24 8BJ, UK;2. Rolls-Royce Corporation, 546 South Meridian St, Indianapolis, USA;3. Intertek, Derby, DE24 8BJ, UK |
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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. |
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Keywords: | Ceramic matrix composite Sub-Element Fatigue Digital image correlation |
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