封伟强,王伟,孟松鹤,许承海,解维华.基于数字图像相关方法的石墨高温杨氏模量测试[J].装备环境工程,2016,13(3):18-24. FENG Wei-qiang,WANG Wei,MENG Song-he,XU Cheng-hai,XIE Wei-hua.Measurement of High-temperature Young's Modulus on Graphite Based on Digital Image Correlation[J].Equipment Environmental Engineering,2016,13(3):18-24.
基于数字图像相关方法的石墨高温杨氏模量测试
Measurement of High-temperature Young's Modulus on Graphite Based on Digital Image Correlation
投稿时间:2016-01-25  修订日期:2016-06-15
DOI:10.7643/ issn.1672-9242.2016.03.003
中文关键词:  石墨  高温应变场  数字图像相关方法  杨氏模量  应力-应变曲线
英文关键词:graphite  high-temperature strain field  digital image correlation method  Young's modulus  stress-strain curve
基金项目:国家自然科学基金面上项目(11472092);国家重点基础研究发展计划(2015CB655200)
作者单位
封伟强 哈尔滨工业大学 复合材料与结构研究所,哈尔滨 150080 
王伟 哈尔滨工业大学 复合材料与结构研究所,哈尔滨 150080 
孟松鹤 哈尔滨工业大学 复合材料与结构研究所,哈尔滨 150080 
许承海 哈尔滨工业大学 复合材料与结构研究所,哈尔滨 150080 
解维华 哈尔滨工业大学 复合材料与结构研究所,哈尔滨 150080 
AuthorInstitution
FENG Wei-qiang Center for Composite Materials, Harbin Institute of Technology, Harbin 150080, China 
WANG Wei Center for Composite Materials, Harbin Institute of Technology, Harbin 150080, China 
MENG Song-he Center for Composite Materials, Harbin Institute of Technology, Harbin 150080, China 
XU Cheng-hai Center for Composite Materials, Harbin Institute of Technology, Harbin 150080, China 
XIE Wei-hua Center for Composite Materials, Harbin Institute of Technology, Harbin 150080, China 
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中文摘要:
      目的 为了得到石墨在高温环境下的杨氏模量,为飞行器热防护系统和高温热结构的设计提供可靠的技术保障。 方法 基于数字图像相关(DIC)方法和通电电阻加热技术,建立一套测量材料在高温环境下力学性能的测试系统。利用该系统,测量高温下石墨试样的表面应变场和应力-应变曲线,计算相应温度下的杨氏模量。在 1400 ℃实验环境下,采用基于 DIC 与高温引伸计的方法同时测量超高温陶瓷试件的拉伸应变数据,并进行比较验证。 结果 在 1400 ℃实验环境下,采用基于 DIC 与高温引伸计方法测得超高温陶瓷的应变-时间曲线吻合良好,方差为 1.3×10-7。1200~1900 ℃高温环境下,石墨的杨氏模量随温度的升高呈线性增长趋势。 结论 采用基于 DIC 方法准确有效,该方法可方便快速地实现对石墨材料在高温环境下杨氏模量的测量。另外,该方法也可应用于其他导电材料杨氏模量的测试。
英文摘要:
      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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