DISPLACEMENT FIELD AND STRAIN FIELD MEASUREMENT METHOD, AND MATERIAL TESTING MACHINE

摘要

In the present invention, in displacement-field and strain-field measurement using a material testing machine, fixed noise in an image acquired in grayscale by a video camera (23) is probabilistically modelled on the basis of the shading, and using this fixed noise probabilistic model, uncertainty is evaluated for the measured value of the center of gravity of a dot put on the surface of a test piece when a load is applied. Further, according to a propagation rule of the uncertainty, the amount of dot displacement, the displacement field and the strain field are probabilistically calculated from the dot center of gravity measurement results. Consequently, it becomes possible to show the uncertainty along with the measurement results of the physical amounts for these items.