Evaluation of stress redistribution in CMCs using phase-shifting Moire interferometry and thermoelastic infrared imaging
- Univ. of Illinois, Urbana, IL (United States)
Stress redistribution is a key feature affecting the practical utility of composite materials. A non-linear material response, such as fiber debonding and sliding, results in stress redistributions in the vicinity of stress concentrators. The existence of stress redistribution in ceramic matrix composites has been demonstrated using thermoelastic techniques, the results of which will be compared to surface strain maps gathered using phase-shifting Moir{acute e} interferometry. The Moir{acute e} technique measures strain distributions, while thermoelastic imaging measures strain distributions. The combination of both techniques permits experimental assessment of changes in the constitutive response of the materials. Results of Moir6 and thermoelastic experiments will be presented for three composite systems: C/C, SiC/CAS, and SiC/SiC. In the case of the SiC/CAS composite, the stress redistribution results in a notch-insensitive material. The changes in the constitutive response is rationalized based upon changes in the micro-mechanical properties of the composites. Thus, careful processing control can be exploited to design materials with varying amounts of notch-sensitivity.
- OSTI ID:
- 175376
- Report Number(s):
- CONF-950686-; TRN: 95:006111-0347
- Resource Relation:
- Conference: Joint applied mechanics and materials summer meeting, Los Angeles, CA (United States), 28-30 Jun 1995; Other Information: PBD: 1995; Related Information: Is Part Of AMD - MD `95: Summer conference; PB: 520 p.
- Country of Publication:
- United States
- Language:
- English
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