Abstract
This paper presents an experimental investigation of the failure behavior of SiC fiber-reinforced SiC matrix (SiC/SiC) composite tubes under multiaxial loading. A new testing apparatus is designed to independently apply axial stress and internal pressure to SiC/SiC tubes. Acoustic emission (AE) is used to monitor the damage growth in the specimen. Based on the measured stress–strain response, a strain-based criterion is proposed to determine the proportional limit stress (PLS). The proposed strain-based criterion is compared with the PLS determined by the AE measurement. The PLS is determined for different loading ratios to form a multiaxial failure surface. By testing multiple replicates, the statistical variations of the PLS are determined. Based on the experimental results, a mathematical model is developed to characterize the probability distribution of the PLS of SiC/SiC composites under multiaxial loading.
| Original language | English |
|---|---|
| Article number | 118002 |
| Journal | Composite Structures |
| Volume | 335 |
| DOIs | |
| State | Published - May 1 2024 |
Funding
The authors acknowledge the financial support provided by the Nuclear Energy University Program of the US Department of Energy, Office of Nuclear Energy , under grant DE-NE0008785 . The work at Oak Ridge National Laboratory was partially supported by the US Department Energy, Office of Nuclear Energy, for the Advanced Fuels Campaign , under contact DE-AC05-00OR22725 with UT-Battelle, LLC.
Keywords
- Acoustic emission
- Failure criterion
- Multiaxial stress
- Probability distribution
- Proportional limit stress
- Uniaxial tension
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