レーザスペックルとフラクタル解析によるアルミニウム多結晶板の表面あれの評価

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The speckle intensity distributions of a laser beam reflected from a surface of a polycrystalline aluminum specimen were changed due to the plastic deformation of the specimen and were measured using the image processing technique. The cross section of the laser speckle pattern on a same gray level could be expressed quantitatively by an elliptic function ; the correlation between an aspect ratio of the ellipsoidal shape and the growth of anisotropy induced by the plastic deformation, the onset of yielding and localized deformation was studied in the preceding paper. In this paper, the effects of the grain size and the rolling reduction of an aluminum specimen upon both the reflected speckle intensity distribution of the laser beam from the surface of the specimen and the optical surface image obtained by the optical microscope under the plastic deformation were studied through the fractal dimensional analysis. The results obtained are summarized as follows ; (1) The speckle intensity distribution expanded with increase of plastic strain ; the degree of the expansion was increased with the growth of the grain size of specimen, while the change of aspect ratio was very small. (2) At the initial stage of the plastic deformation, the aspect ratio of rolled specimen rapidly decreased, and the change of the aspect ratio was dependent upon the rolling reduction of the specimen. (3) The good correlation between the plastic strain and the fractal dimension of the speckle intensity distribution due to the surface roughening of the specimen was obtained.
一般社団法人日本機械学会の論文
1998-02-25

レーザスペックルとフラクタル解析によるアルミニウム多結晶板の表面あれの評価

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