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Experimental solution for viscosity coefficient of solid alloy material

Luo Y. S., Dohda K., Wang Z.

International Journal of Applied Mechanics and Engineering

2003

Vol. 8, no spec.

271-276

This paper deals with the experimental method and solution for viscosity coefficient of solid alloy materials, such as, solid aluminum alloy Lc4. Standard creep specimen of f10mm with male screw ends were adopted, and groups of creep tests were carried out under high-temperature on RD2-3 type creep-machines. Tests under a constant temperature but different stress levels, and under a constant stress but different temperature levels were carried out. The effects of temperature and stress on strain and strain rate were analyzed. By putting the experimental data into the constitutive equation of the rheological model of viscoplastic material, the viscosity coefficients of the solid alloy materials under different temperature levels and stress levels were derived easily. They are similar to viscosity coefficient of non-Newtonian fluid. This experiment is simply to be operated, and the calculation is conveniently to be solved.

Friction behavior of aluminum alloy 3004 sheets in ironing process

Dohda K., Wang Z.

Applied Mechanics and Engineering

1999

Vol. 4, no spec.

133-138

The purpose of this research is to investigate the effect of, ?, the angle between the ironing direction and the rolling direction of the rolled sheets, on the friction behavior in the ironing process of aluminum alloy 3004 sheets under various frictional conditions by changing the viscosity of lubricant, the thickness of lubricant film, working velocity etc.. Experiments showed that the difference in the friction coefficient due to? becomes smaller with increasing viscosity of the lubricant/working velocity or decreasing surface roughness of the rolled sheet. For the lowest viscosity of lubricant in the present experiment, the friction coefficient for ?=0° is about 3 times of the friction coefficient for ?=90°.