| Summary: | 碩士 === 國立中央大學 === 光機電工程研究所 === 107 === The purpose of this paper is to measure the strain distribution of workpieces fabricated by laser additive manufacturing. According to the experiment, the influence of the laser additive manufacturing parameter on the variable distribution is known, such as different growth directions and heat treatment. The method used for strain distribution measurement is the digital image correlation method, and the software is Ncorr.
We perform the tensile test on the workpiece and record it with the camera. The image is Gaussian filtered for strain analysis. Before performing the strain distribution measurement experiment, we need to confirm the accuracy and efficiency of the digital image correlation method. Experiments on the effects of different parameters on digital image correlation methods, use a laser displacement meter with a displacement platform. When the number of seed points is 2 or 4, the analysis is performed using the subset size of 60 pixels. The result is only 0.1 μm from the average difference of the laser displacement meter.
This paper also discusses the error of measurement, which is the random error and system error caused by the environment. In terms of camera erection, the vertical and horizontal axes of the camera and the test piece will also cause errors, and the spot size and correction will also bring a slight error. Compared with other strain measurement methods, the experimental structure of the system not only has the advantage of not touching the workpiece, but also can discuss the large-area changes and reduce the cost. Therefore, the digital image correlation method is a set of potential technologies for measuring mechanical parameters.
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