真空环境下钨材料高温形变的数字相关测量技术研究

Investigation on digital image correlation measurement technique for high temperature deformation of tungsten materials in vacuum environment

钨是目前聚变堆偏滤器及第一壁结构中首选的面向等离子体材料,其服役条件下的力学性能在聚变工程中具有重要参考价值和研究意义。本文采用数字图像相关测量设备在真空高热流综合实验平台上,开发了基于碳化钽的散斑材料及制备工艺,设计和实现了基于外加光源和自身辐射光源的测量光路方案,测量了钨材料试件在25℃至2000℃温度范围的热膨胀变形,所得结果与文献提供的钨材料热膨胀应变结果吻合,误差小于1%,验证了测量技术方案的准确性和可行性,为进一步发展聚变工程材料在高热流冲击工况下的观测技术打下了基础。

The mechanical behavior of tungsten under high temperature conditions has great significance and important reference value in fusion reactor engineering as tungsten is currently the first choice of plasma facing materials of the divertor and the first walls.. In this paper, the thermal expansion deformation of tungsten material in temperature range of 25℃ and 2000℃ is measured by a digital image correlation (DIC) equipment based on a vacuum high-heat-flux comprehensive experimental platform, in which a special speckle preparation technique using tantalum carbide powder is developed and two kinds of DIC light path arrangements with external and self-radiation blue light source respectively are designed and realized. The measurement results are in good agreement with those calculated by an empirical correlation equation provided from material handbook (the general error is less than 1%), validating the feasibility and accuracy of adopted measuring techniques. The techniques developed in present investigation lay good foundation for further development of measurement technology of materials under high heat flux shock in fusion engineering.