High-sensitivity measurements of deformation in a fatigue-loaded weld specimen using a portable moire interferometer

摘要

The present experiment demonstrates the application of high-sensitivity moire-interferometry to measurements of deformation around an artificial notch in a weld material on a specimen consisting of two 50 mm thick steel plates welded together. The tests were performed at the standard sensitivity of 417 mm per fringe order and the field of view was 20 mm by 20 mm. The 125 mm wide specimens were loaded in four-point bending under loads as high as 350 kN. The load was applied using a servo-controlled hydraulic testing machine. The compact moire interferometer was attached to one of the four loading points of the machine and was moving with it during load application. The experiment was performed in an industrial type facility without any means of reducing the vibrations of the experimental setup. The interferograms were analyzed using a digitizing tablet and hybrid technique of data processing.