Wang Huanqing, Ge Pengxiang, Wen Wu, Wang Yonghong, Wang Biao
Appl Opt. 2022 Oct 10;61(29):8695-8703. doi: 10.1364/AO.469885.
Digital image correlation (DIC) is an optical measurement method of material strain/displacement based on visible light illumination, which can be used for the measurement of long-term mechanical behavior. In this paper, an experimental method for analyzing high-temperature creep in FV566 steel material based on DIC was independently designed. Aiming at the problems of glass observation window medium refraction and thermal airflow disturbance in high-temperature testing, the corresponding correction methods were proposed to improve the measurement accuracy. Based on the above methods, high-temperature creep tests were carried out on three specimens with different shapes, and the strain concentration area at 600°C was calculated. Then, the influences of shape and other properties on material creep failure, stress distribution, and actual strain were investigated. Finally, the DIC calculation results were analyzed and compared with results of finite element analysis and the final fracture position of the specimen. The three results had a high degree of consistency, which verified that the proposed method can accurately measure and analyze the creep behavior of materials.
数字图像相关（DIC）是一种基于可见光照明的材料应变/位移光学测量方法，可用于长期力学行为的测量。本文自主设计了一种基于DIC分析FV566钢材料高温蠕变的实验方法。针对高温试验中玻璃观察窗介质折射和热气流扰动的问题，提出了相应的校正方法以提高测量精度。基于上述方法，对三个不同形状的试样进行了高温蠕变试验，并计算了600°C时的应变集中区域。然后，研究了形状等特性对材料蠕变失效、应力分布和实际应变的影响。最后，对DIC计算结果进行了分析，并与有限元分析结果和试样的最终断裂位置进行了比较。这三个结果具有高度一致性，验证了所提方法能够准确测量和分析材料的蠕变行为。
