Research Reports 2004@Up date@2006.7.10
Abstracts of
Papers
- Plastic Deformations of
Micro-Spheres by Solidified Lubricants and Lubricants' Shear Characteristics
under Very High Pressure (Part 1) | Observation of Plastically-Deformed
Micro-Spheres | [in Japanese], Yuichi NAKAMURA, Yutaka ISHIBASHI* and Yasushi
KUROSAKI: Tribologist, 49-6, pp. 518-524, 2004.
- Fractal analysis of
adhesion on tool surface in compression of aluminum strips by using AFM [in
Japanese], Masahito MATSUI, Yasushi KUROSAKI and Yusuke MIYAUCHI: Journal of
Japan Institute of Light Metals, 54-1, pp. 9-13, 2004.
Adhesion properties in simple compression of
aluminum strips are analyzed in the micro/nanometer range by employing the
zeroset and power spectrum fractal analyses. An atomic force microscope (AFM)
is used to estimate the fractal dimensions. It is found that the adhesion and
tool and specimen surfaces have fractal structure. Various fractal dimensions
obtained for the adhesion and tool and specimen surfaces are compared to each
other and discussed. When the surface roughness of tool is same, the ratio of
the total adhesion area depends on the fractal dimension. Though the AFM
apparatus is difficult to distinguish the adhesion particles from the tool
surface, the power spectrum dimension has possibility of distinguishing the
adhesion particles from the tool surface. Finally, a method for computer
simulation of the nanometer scale surface structure is presented, and
satisfactory images are constructed.
- Nanofractal Analysis on
Material Surfaces Using AFM, Mir Behdad Khamesee, Yasushi Kurosaki, Masahito
Matsui and Kenichi Murai: Materials Transactions, 45-2, pp. 469-478,
2004.
The surface structures of four
materials (a pure aluminum sheet, an aluminum alloy sash, a thickness gauge
and a magnetic tape) are observed on the nanometer scale by atomic force
microscopy (AFM) and analyzed by one-dimensional fractal analyses. It is
confirmed for all the surfaces that they have a self-affined fractal property
under a resolution of 1nm. The two-dimensional fast Fourier transformation
(2D-FFT) analysis is also applied to these surfaces and their characteristics
are clarified. The power spectrum model for surface simulation is proposed and
its validity is confirmed by experimental results. A method for simulating
surface structure of any materials is presented, and its validity is shown on
some materials whether in-plane isotropic or anisotropic. A computer aided
engineering (CAE) system composed of 2D-FFT and inverse FFT (IFFT) for
quantitative estimation of surface nanostructures is advanced and applied to
various surface problems. It enables the mass data of material surface to
compress into only three parameters.