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| Content Provider | The American Society of Mechanical Engineers (ASME) Digital Collection |
|---|---|
| Author | Abdi, Frank Xue, Yibin Gregory, N. Morscher Choi, Sung |
| Copyright Year | 2014 |
| Abstract | SiC-based ceramic matrix composites (CMC) in turbine engine applications must sustain certain foreign object impacts that might occur in services. Experiments and nondestructive evaluation (NDE) have illustrated good correlations between impact energy and foreign object damage (FOD) assessed using electrical resistivity (ER), acoustic emission (AE), and microscopy. In this paper, a progressive failure dynamic analysis (PFDA) method is explored in understanding and predicting the damage states, electrical resistivity, and residual strength after impact of CMCs. In general, CMCs are modeled using effective fiber, matrix, and interface constitutive behaviors, from which the lamina stiffness and strengths can be derived. Similarly, the electrical resistivity of a lamina is homogenized based on the percolation theory for inclusion/discontinuities dispersion in a matrix for voids and Si particles, as well as fibers, and damages after impact. To accurately correlate the damage state with ER, the PFA tool has been improved to incorporate the physical damage mechanisms in CMCs, which are matrix microcrack density due to both longitudinal and transverse tensile loads and the fiber breakage due to probabilistic fiber strength distribution. The predicted damage states and ER are correlated with the measurement of FOD and validated with tension after impact tests using high temperature ER. The PFDA tool has demonstrated a great potential for CMCs’ FOD and residual strength predictions. |
| Sponsorship | International Gas Turbine Institute |
| File Format | |
| ISBN | 9780791845752 |
| DOI | 10.1115/GT2014-25981 |
| Volume Number | Volume 6: Ceramics; Controls, Diagnostics and Instrumentation; Education; Manufacturing Materials and Metallurgy |
| Conference Proceedings | ASME Turbo Expo 2014: Turbine Technical Conference and Exposition |
| Language | English |
| Publisher Date | 2014-06-16 |
| Publisher Place | Düsseldorf, Germany |
| Access Restriction | Subscribed |
| Subject Keyword | Microcracks Ceramic matrix composites Dynamic analysis Percolation theory High temperature Density Stress Fibers Nondestructive evaluation Gas turbines Microscopy Electrical resistivity Particulate matter Impact testing Stiffness Tension Damage Failure Acoustic emissions |
| Content Type | Text |
| Resource Type | Article |
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