Chinese Journal of Liquid Crystals and Displays, Volume. 35, Issue 8, 861(2020)
Design and application of digital speckle patterns in digital image correlation method
Aiming at the digital image correlation (DIC) experiment, ordinary paint speckle can not meet the requirement of ultra-high temperature environment, the method of designing and transferring the digital speckle patterns (DSPs) is studied. The design of the digital speckle patterns determine the circle center coordinates of each speckle by matrix transformation, and then a random degree is applied to each circle center coordinate, and it is programmed by Matlab. The laser marking technology is used to transfer it to the surface of the test piece. The accuracy of speckles are analyzed by roundness and area ratio, and the paint speckles and DSPs are compared and analyzed by the average speckle gradient method. The results show that the accuracy of DSPs transferred by laser marking technology is higher than that of ordinary spray paint speckle, and the quality is stable. The DSPs is used in the high-temperature welding test. In the test, the speckle is deformed along with the test piece, and no phenomena such as shedding and melting under high-temperature occurred.
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QIAN Wei, JIANG Ming. Design and application of digital speckle patterns in digital image correlation method[J]. Chinese Journal of Liquid Crystals and Displays, 2020, 35(8): 861
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Received: Jan. 12, 2020
Accepted: --
Published Online: Aug. 18, 2020
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