NONCONTACT MEASUREMENTS OF NORMAL DEFORMATION FIELDS OF A CONSTRUCTION SURFACE BY VIDEOGRAMMETRY METHODS WHILE STRENGTH TESTING

摘要

A videogrammetry method using one digital camera for noncontact measurements of a distributed normal deformation of construction elements with a flat surface or having a small curvature is developed. Investigations of the surface buckling are performed at the local shell budding of typical cylindrical fuselage panels of a passenger plane made of aluminum alloy and at the general buckling of a full-scale flat panel of a perspective aircraft wing box made of polymer composite material with a loading up to destruction. It is found that in both cases, the buckling deformation of the surface has two main modes with the opposite sign of normal deviations. The maximum deformation deviations of positive and negative modes of the panel made of aluminum alloy are +1.26 and -2.47 mm, and those of the positive and negative modes of the panel made of composite material are ±1.33 mm directly before the destruction.