1 results about "Strain measurement" patented technology

The invention belongs to the technical field of composite stress and strain measurement, and provides an out-of-surface strain measuring method based on digital image correlation. The out-of-surface strain measuring method comprises the steps of: firstly, conducting a text according to an experimental scheme, correlating a camera with a force sensor in order to ensure that a distance between a lens and a test piece remains unchanged, driving the camera and force sensor to move simultaneously, slowly loading the test piece, and pressing down a camera shutter at the same time, wherein the camerashutter is not loosened during the test process until the end of loading, and images and test data before and after deformation are obtained after the test ends; secondly, writing an algorithm for calculating and searching a position of a point after deformation, so as to obtain deformation information (displacement and strain) of the test piece, and performing bilinear interpolation to obtain astrain value of an arbitrary point of the test piece through dividing regions; and finally, acquiring a strain cloud chart of the test piece through setting shades of colors according to whether the strain value is plus or minus and the magnitude of the strain value. The out-of-surface strain measuring method is convenient to operate, can be applied to deformation measurement of complicated structures, improves the calculation efficiency and expands the applicable range.