摘要
结合数字图像相关(digital image correlation,DIC)方法高温应用的需求,该文重点对散斑制备技术和高温散斑图像处理技术进行了研究。首先,以高温结构材料为对象,研发了一种基于参数化模板的高温散斑制作工艺。该工艺基于参数化模板,可调整模板中散斑颗粒大小、分布密度和分布随机度等多个参数,成功地在C-SiC复合材料基底上制备出可耐1 200℃高温散斑载体。其次,分析了热气流、热辐射对DIC测量结果的影响,结合图像灰度平均方法、循环高温炉外热气流和光学滤波法等3种手段进行高温散斑图像的修正,并通过热膨胀系数测量实验验证了修正方法的可行性。
According to requirement of the high-temperature application from the digital image correlation(DIC)method,the speckle fabrication methods and high-temperature speckle image processing technique are studied in this paper.Taking high-temperature structural materials as the studied objects,a high-temperature speckle fabrication technique based on parametric template is developed.The technique is mainly based on a parametric template,which can adjust the parameters such as particle size,distribution density,and randomness in the template.As a result,the quality of the speckle can be optimized.A high-temperature speckle pattern was successful fabricated on the C-SiC composite substrate by the proposed technique,and the experiment verifies the speckle carrier can endure high temperature up to 1 200℃.At the same time,the influence factors of thermal disturbance and thermal radiation on DIC measurement results are analyzed.The high-temperature speckle images are corrected with approaches of image grayscale-average,circulating thermal disturbance and optical filtering method.And a test for measuring the thermal expansion coefficient is designed to verify the feasibility of the correction methods.
作者
段淇元
宫文然
郭保桥
吴立夫
于兴哲
谢惠民
DUAN Qiyuan;GONG Wenran;GUO Baoqiao;WU Lifu;YU Xingzhe;XIE Huimin(School of Aerospace Engineering,Tsinghua University,Beijing 100084,China;Beijing Institute of Structure and Environment Engineering,Beijing 100076,China;State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China;Beijing Institute of Astronautical Systems Engineering,Beijing 100076,China)
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2019年第6期425-431,共7页
Journal of Tsinghua University(Science and Technology)
关键词
高温
数字图像相关
热气流
热辐射
散斑
high temperature
digital image correlation
thermal disturbance
thermal radiation,speckle pattern
