日本金属学会誌
Online ISSN : 1880-6880
Print ISSN : 0021-4876
論文
CT 値ヒストグラムに基づく複合材料の大局的構造評価法の検討
奥村 真彦滝 克彦齋藤 泰洋松下 洋介青木 秀之
著者情報
ジャーナル フリー

2015 年 79 巻 10 号 p. 497-503

詳細
抄録

  The effect of perspective structure on the computed tomography (CT) value histogram of a three-dimensional (3D) X-ray computed tomographic image was investigated. Images of sphere bead packed beds were taken and the histograms were compared with each other. Normal distributions were fitted to histogram peaks to evaluate histogram shapes. Peaks corresponding to air and alumina were observed in histograms of alumina bead packed beds. The difference between mean values of the peaks decreased and peak standard deviations increased with decreasing bead diameter because of a stronger partial volume effect. Because of this effect, the CT value of a boundary voxel is between CT values of materials present in the voxel. Peaks corresponding to air and glass were observed in histograms of glass bead packed beds. The mean value of the air peak in glass bead packed beds was smaller than that observed in alumina bead packed beds because the specific gravity of glass is smaller than that of alumina. For beds packed with both alumina and glass beads, peak positions of each material differed from those obtained for beds packed with either alumina or glass beads. This indicates that the partial volume effect is caused by boundaries between not only air and beads but also alumina and glass beads. Therefore, the shape of CT value's histogram depends on the 3D structure of the bed. This suggests that the three-dimensional structure can be evaluated on the basis of histogram shape.

著者関連情報
© 2015 (公社)日本金属学会
前の記事 次の記事
feedback
Top