研究目的
To propose an original method for controlling sample damage amplification using the IMPACT setup and assess its relevance through experimental testing on SiC and Inconel 625 materials under concentrated solar irradiation.
研究成果
The numerical model effectively predicts thermo-mechanical behavior and helps design cycling strategies to amplify damage. Experimental results validate the relevance of thermo-mechanical indicators for describing damage evolution, with thresholds identified for Inconel 625 to prevent critical damage. This approach can be adapted for monitoring solar receivers in operation, but further work is needed to classify damage types and refine the method.
研究不足
The study is limited to specific materials (SiC and Inconel 625) and cycling conditions. The numerical model assumes constant convective heat transfer coefficients and may not fully capture all real-world complexities. Acoustic emission analysis for SiC is challenging due to rare but energetic hits. No critical damage thresholds were identified for SiC in the tested range.
1：Experimental Design and Method Selection:
The study uses the IMPACT setup for in situ acoustic emission monitoring to characterize thermo-mechanical damage in materials under concentrated solar irradiation. A numerical model is developed using Code_Aster to simulate thermo-mechanical behavior and design cycling strategies.
2：Sample Selection and Data Sources:
Two materials are selected: Silicon Carbide (SiC) and Inconel 625. Their properties are measured or sourced from suppliers, including density, thermal conductivity, elastic properties, and emissivity.
3：Their properties are measured or sourced from suppliers, including density, thermal conductivity, elastic properties, and emissivity. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment includes a 2 m diameter solar furnace, acoustic emission sensors (MICRO80), pyrometers, thermocouples, gas pycnometer, Laser Flash Analysis device (LFA 427), ultrasonic pulse echography equipment, and MEDIASE facility for emissivity measurement. Materials are SiC and Inconel 625 samples.
4：Experimental Procedures and Operational Workflow:
Samples are exposed to solar cycling at the focus of a solar concentrator. Solar flux is controlled with a shutter and homogenized with a kaleidoscope. Acoustic emission is recorded during cycling, and temperature is measured. Cycling strategies are designed based on numerical simulations to amplify damage.
5：Data Analysis Methods:
Acoustic emission data is analyzed using hit counting and energy cumulation. Thermo-mechanical indicators (e.g., Manson-Coffin, Smith-Watson-Topper, Zenner-Hollomon, Gollos-Ellyn) are calculated from numerical models and experimental data to assess damage evolution.
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solar furnace
2 m diameter
PROMES
Concentrates solar irradiation for experimental testing
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acoustic emission sensor
MICRO80
PAC
Records acoustic emission hits from samples
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Laser Flash Analysis device
LFA 427
Netzsch
Measures thermal conductivity of materials
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gas pycnometer
Micromeritics
Measures bulk density of materials
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ultrasonic pulse echography equipment
Determines elastic properties and propagation velocities
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MEDIASE facility
PROMES and CNES
Measures hemispherical emissivity at high temperatures
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pyrometer
Measures front face temperature of samples
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thermocouple
Measures rear and side temperatures of samples
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kaleidoscope
Homogenizes solar flux distribution on sample surface
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shutter
Controls concentrated solar irradiation on sample surface
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acquisition device
PAC
Collects and processes acoustic emission signals
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