モアレ干渉法によるひずみと変位測定における面外回転の影響

概要

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In the displacement and strain measurement using moire interferometry, the out-of-plane rotation of a specimen caused by bending, for example, will strongly affect the measured values. When a specimen is deformed with an out-of-plane rotation angle θ_y about the y-axis, the normal strainε_x in the x-direction is given byε_x = (1/f)(ΔN_x/Δx)+(θ^2_y/2), where f is the frequency of the reference grating and N_x is the fringe number of the fringe pattern. A photoresist master grating of 900 lines/mm was replicated on the surface of a cantilever beam specimen using silicon rubber. The measured displacement u and strainε_x in the x-direction deviated greatly from the theoretical values, but the values corrected for the rotation angle θ_y agreed well with the theoretical values.
一般社団法人日本機械学会の論文
1993-11-25