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| Measurement of High-temperature Young's Modulus on Graphite Based on Digital Image Correlation |
| Received:January 25, 2016 Revised:June 15, 2016 |
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| DOI：10.7643/ issn.1672-9242.2016.03.003 |
| KeyWord:graphite high-temperature strain field digital image correlation method Young's modulus stress-strain curve |
| Author | Institution |
| FENG Wei-qiang |
Center for Composite Materials, Harbin Institute of Technology, Harbin , China |
| WANG Wei |
Center for Composite Materials, Harbin Institute of Technology, Harbin , China |
| MENG Song-he |
Center for Composite Materials, Harbin Institute of Technology, Harbin , China |
| XU Cheng-hai |
Center for Composite Materials, Harbin Institute of Technology, Harbin , China |
| XIE Wei-hua |
Center for Composite Materials, Harbin Institute of Technology, Harbin , China |
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| Abstract: |
| Objective To obtain the Young's modulus of graphite in high-temperature environment, and provide reliable technical guarantee for the design of aircraft thermal protection systems and high-temperature structure. Methods Combining the digital image correlation (DIC) method and energized resistance heating technology, this paper established a test system for measuring mechanical properties in high-temperature environment. Using this system, this paper obtained the surface strain field and stress-strain curve of graphite at different temperatures, and calculated Young's modulus of graphite in high-temperature environment. The tensile strain data of Ultra High Temperature Ceramic specimens were measured using DIC and high temperature extensometer method simultaneously at 1400 ℃ in the experimental environment, and comparison and verification were conducted. Results The strain-time curves of UHTC measured by DIC and high-temperature extensometer method at 1400 ℃ in the experimental environment were in good agreement, with a variance of 1.3×10-7. In high-temperature environments with temperatures of 1200 ~ 1900 ℃, the Young's modulus of graphite increased linearly with the increase of temperature. Conclusions The method based on DIC was accurate and effective, and this method could easily and quickly achieve the measurement of the Young's modulus of graphite material in high-temperature environment. Moreover, the method could also be applied to measure the Young's modulus of other conductive materials. |
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