Abstract
Digital image correlation (DIC) is a kind of displacement and strain measurement technique. It can realize non-contact and full-field measurement and is widely used in the testing and research of mechanical properties of materials at high temperatures. However, many factors affect measurement accuracy. As the high temperature environment is complex, the impact of heat waves on DIC is the most significant factor. In order to correct the disturbance in DIC measurement caused by heat waves, this paper proposes a method based on the background-oriented schlieren (BOS) technique. The spot pattern on the surface of a specimen in digital image correlation can be used as the background in the background-oriented schlieren technique. The BOS technique can measure the distortion information of the images caused by heat flow field. The specimen images taken through the heat waves can be corrected using the distortion information. Besides, the characteristics of distortions due to heat waves are also studied in this paper. The experiment results verify that the proposed method can effectively eliminate heat wave disturbances in DIC measurements.
Highlights
The mechanical properties of materials are significant in the utilization of materials
The error levelmeasurement of digital image correlation (DIC) measurement with or the ofinfluence the heat waves is analyzed, and experiments show the characteristics of heat waves on of the heat waves is analyzed, and experiments show the characteristics of heat imaging waves on distortions
In-plane displacement measurement experiments disc were carried out verify that the measurement experiments ofof a adisc were carried out toto verify that the proposed method can improve the accuracy of DIC measurements
Summary
The mechanical properties of materials are significant in the utilization of materials. Many experts and scholars have studied this problem and made many efforts to eliminate the influence of heat waves on DIC measurement results by improving experimental devices and algorithms. Actual environments iare complex and variable, and it is difficult to predict the distortion caused by heat waves accurately Another algorithm idea is to regard the effect of heat waves on the image as a kind of noise and process the image using a denoise algorithm to achieve better DIC measurement results. The results proved that the signal to noise ratio of the processed images was significantly improved In this method, it was assumed that a point on the image, under the influence of the heat waves, is oscillating around the real value. 2, the characteristics of distortions due to heat waves are analyzed, Section 2, the characteristics of distortions due to heat waves are analyzed,and andthe theflow flowofofthe the proposed method is introduced in detail
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