Dynamic moiré measurement of strains induced in a titanium tube plate during the rolling of a series of tubes

The strains developed in a Ti tube plate by the process of roller expansion of tubes were measured by moire interferometry. The max. strains during the process were recorded by photographing the fringe patterns during rolling at a rate of five frames/s. The tubes were rolled according to a prearranged pattern, and the deformations over the whole tube plate element were recorded between the rolling of successive tubes; by this means, the effect of each tube rolling on the overall strain pattern was assessed. 7 ref.--AA