E-Thesis 33 views
Novel Test Techniques for the Detection and Identification of Damage in SiCf/SiC Ceramic Matrix Composites / CHRISTOPHER NEWTON
Swansea University Author: CHRISTOPHER NEWTON
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DOI (Published version): 10.23889/SUthesis.59381
The complex structural architecture and inherent processing artefacts within ceramic matrix composites combine to induce inhomogeneous deformation and damage prior to ultimate failure under mechanical loading. Bulk measurements of strain via extensometry or even localised strain gauging will fail to...
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The complex structural architecture and inherent processing artefacts within ceramic matrix composites combine to induce inhomogeneous deformation and damage prior to ultimate failure under mechanical loading. Bulk measurements of strain via extensometry or even localised strain gauging will fail to characterise such inhomogeneity when performing conventional mechanical testing on laboratory scaled coupons. By applying novel mechanical test techniques such as digital image correlation (DIC), resistance monitoring, acoustic emission (AE) and X-ray computed tomography (XCT) to the room temperature axial assessment of a SiCf/SiC composite under static and ratchetted loading, localised and bulk damage progression can be quantified. Ceramic matrix composites (CMCs) offer a combination of low density and thermal stability for structural engineering applications where long-term exposure to high temperature environments is applicable. Advanced processing techniques have been optimized to produce CMC materials based on oxide/oxide and SiCf/SiC systems, for example, which can be tailored to the manufacture of engineering components destined to operate at 800°C and above. However, the uptake of these composite materials has been slow, mainly due to the high inherent cost of both the raw materials and processing techniques together with their inherent brittle behaviour under applied tensile stress. Hence, previous focus on such systems has been largely restricted to high performance aerospace, power generation and high end automotive applications.
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College of Engineering