1. Fractal Analysis of Free Surface Profile of Sheet Metals under Uniaxial Tension [in Japanese]. Yasushi KUROSAKI, Masahito MATSUI, Takumi KITOH* and Tomoyuki TAKAYAMA: Transactions of the JSME Ser. C, Vol. 62, No. 602, pp. 4107-­4113, 1996. Also, Proc. of AEPA, Higashi­Hiroshima, pp. 863-­868, 1996.
   
   Characteristics of the free surface profile of aluminum sheets under uniaxial tension are examined by employing fractal analysis. As a fractal analysis method applicable to a self­affine surface, a zeroset method for generating intersections of the surface profile in a base plane is presented. It is found that the fractal dimensions of a surface resulting from plastic deformation tends to be constant (2.35), and each asperity has a uniform fractal structure. Other fractal analysis methods are also applied to surface profile curves, and characteristics of various fractal dimensions are discussed.
   
   
2. Application of Fractal Analysis to Adhesion Phenomena in Metal Forming. Yasushi KUROSAKI and Masahito MATSUI: Advanced Technology of Plasticity 1996, Vol. 2, Proc. 5th ICTP, Columbus, pp. 401-­404, 1996.
   
   Adhesion particles on the tool surface in simple compression of aluminum strips are analyzed by introducing a concept from fractal geometry. Fractals are seen in the shape of particles and in both the tool and specimen surfaces. The shape of particles is found to be statistically self­similar, and estimation of its fractal dimensions depends on the surface topology of specimens, irrespective of the compressive strain, tool surface finishing and lubrication. The total adhesion area increases with an increase in the fractal dimension of the tool surface. A method for computer simulation of the adhesion is presented.
   
   
3. A New Viscometry of Lubricants under High Pressure by Rayleigh Light Scattering Technique Using DAC, Yuichi NAKAMURA, Ikuya FUJISHIRO*, Masayuki TSUNODA*, and Tatsuya MATSUI*: Proc. of International Tribology Conference, Yokohama, II, pp.657-662, 1996.
   
   A new viscosity measuring system was designed and set up employing Rayleigh light scattering technique using a diamond-anvil high-pressure cell. Two kinds of experiments were attempted. The one was the measurement for dilute suspensions of polystyrene latex spheres in liquid lubricants and a W/O emulsion. Definite correlation functions induced by Brownian motion of small spheres in lubricants were obtained. The other experiment was the measurement for 5P4E (polyphenyl ether) without mixing polystyrene spheres. Very weak but observable correlation functions were obtained and the viscosities of glassy state 5P4E (viscosity is about 1012 Pa･s) could be obtained.
   
   
4. Traction Characteristics under High Pressure, High Rolling Speed, and High Temperature, Hiroya ACHIHA*, Shinichi NATSUMEDA*, Yuichi NAKAMURA and Ikuya FUJISHIRO*: Proc. of International Tribology Conference, Yokohama, I, pp.139-144, 1996.
   
   The objective of this research is to grasp the traction characteristics of traction drive machinery under practical severe conditions such as automobile transmission. The traction was measured by a specially designed four-disk machine. This machine allows measurement at a mean Hertzian contact pressure of 2 GPa, and maximum rolling speed of 30 m/s. As for theoretical approach, the non-Newtonian behavior of traction fluid was deduced so that the theoretical traction curve could be fitted to the experimental one using the viscosity of traction fluid which was measured under high pressure and high temperature by means of falling ball in a diamond-anvil pressure cell.

Abstracts of Books and Reviews

1. Micro-Measurements of Lubricant's Properties under Very High Pressure [in Japanese], Yuichi NAKAMURA: Proc. of JAST (Japanese Society of Tribologists) Tribology Conference, Tokyo, pp.343-345, 1996.
   
   Application of a diamond-anvil pressure cell (DAC) for tribological micro-measurements was introduced. A falling sphere viscometry with 50 μm sphere in DAC facilitated the viscosity measurement over 1 GPa. Brillouin light scattering measurement in DAC was an effective technique for the evaluation of phonon sound velocity induced by atoms or molecules' motion. Photon-correlation technique with laser light scattering in DAC enabled the viscosity estimation from Brownian motion of sub-micron spheres in lubricant and the viscosity estimation of glassy state lubricants (viscosity is about 1012 Pa･s) from structural relaxation of molecules.