T0301-2-2 自己組織化TiO_2ナノチューブ集合薄膜の破壊特性(マイクロ・ナノの視点からの強度・力学特性評価)

概要

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Self-organized TiO_2 nanotube arrays are formed by anodic oxidization. Nanoindentation experiments with three different indenters (flat punch, cone and triangular pyramid) are conducted to explore the mechanics governing the strength of the TiO_2 nanotubes. Load-displacement responses strongly depend on the tip geometry and the size of nanotubes. A stress-based fracture model considering the graded, porous and discrete structures of the nanotube arrays is proposed, and fracture stress is estimated based on the model. The fracture stresses in the experiments by different indenters are almost the same regardless of the indenter shape, indicating the validity of the model. The model can predict the size effect in strength of the nanotube arrays as well.
一般社団法人日本機械学会の論文
2009-09-12