レーザホログラフィーを応用した岩石のボアソン比およびヤング率の測定

抄録

This paper shows how the laser holography was applied to obtain more accurate Poisson's ratio and Young's modulus of rocks from the determination of displacements in pure bending of prismatical thin rock bars. The small displacements can be recorded on a photographic dry plate easily and directly.
Poisson's ratio is calculated by taking the angle of two asymptotes of the hyperbolas i. s. contour lines expressing same displacement on the dry plate, and Young's modulus can be calculated by using the fringe's number of the hyperbolas in the specific distance in the bending direction. At the same time, these constants were also measured by a strain gage on which was sticked same sample.
As the results, Poisson's ratio and Young's modulus have a tendency to slightly decrease according to the increase of stress, and the values of which were obtained by the holography method were small and accurate to some extent as compared with the values by the strain gage method.