Abstract
This paper describes the experimental results on the deformation of the bolted twin plates measured by real time holographic interferometry. The data obtained by this experiment show the next three conclusions.(1) The shape of the deformation is conical except the small range of the rim of the plate. And the deformation is not so small and it spreads over so large area that its effect should not be omitted when the spring constant of the plate is calculated.(2) The deformation of the bolt-head is measured accurately which had not been measured till this experiment. And its three dimensional shape is conical except the bottom of the dent. And the quantity of the deformation is not so small that its effect should be considered when the spring constant of the plate is calculated.(3) The residual plastic deformation of the plate after the unloading of the compressive overload over the elastic region is measured. Though its quantity is very small, it spreads over the wide area. The results stated above show good agreement with those obtained with another instrument.
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