rechnergeführtes procedure for determining the oberflächenspannungs and dehnungsverteilungen in a deformed body

摘要

A method and apparatus for measuring strain distribution on a deformed surface utilizes a video or photographic camera for taking two images of the surface which are taken at an angle to each other. The surface carries a deformed grid which has grid points that are digitized using images from the camera. The digitized points each form one set of two- dimensional coordinates. Each point of the one set of coordinates is correlated with a corresponding point of the other set. The two sets of two-dimensional coordinates are then used in conjunction with the geometrical relationship between the images to calculate a single set of three-dimensional coordinates for the grid points. The three-dimensional coordinates are then used in groups of three adjacent points to calculate strain over the surface.