Optical imaging of surface strain distribution up to 1500°C: Development of micro‐speckle pattern
Optical imaging of surface strain distribution up to 1500°C: Development of micro‐speckle pattern
复制标题
DOI：
10.1002/ces2.10083
复制
发表时间：
2021-03
期刊：
影响因子：
--
通讯作者：
Y. Arai;R. Inoue;H. Kakisawa
中科院分区：
文献类型：
--
作者：
Y. Arai;R. Inoue;H. Kakisawa
利用紫外高温观测系统（UV- HTOS）结合数字图像相关（DIC）技术，制备了α- al2o3和SiC微颗粒的微散斑图，用于测量温度高达1500℃的平面应变分布。实验结果表明，α- al2o3的平均表面应变与热膨胀系数和温差计算值吻合较好。所提出的散斑图可以用于应变分布测量，即使加热到1500°C后也不会退化。研究结果还表明，本文所制备的模式对于了解复合材料在高温构件中的非均质变形机制是有效的。
Micro- speckle patterns were fabricated using α- Al 2 O 3 and SiC micro- particles for in- plane strain distribution measurement at temperatures up to 1500°C using an ultraviolet high- temperature observation system (UV- HTOS) combined with a digital image correlation (DIC) technique. The experimental results showed that the measured mean surface strains of α- Al 2 O 3 were in good agreement with the calculated values obtained from thermal expansion coefficient and temperature difference. The proposed speckle pattern could be used for strain distribution measurement without degradation even after heating up to 1500°C. The results also demonstrated that the pattern fabricated in this study is effective to understand the heterogeneous deformation mechanism in composite materials applied in high- temperature structural components.