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2 International Journal of Applied Mechanics and Engineering

2 2003

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Exploitation and applicating research on surveying system of pyromagnetic effect during rupture process of PVC sheet with defects

Luo Y. S., Su J. X., Deng X. H., Chen W.

International Journal of Applied Mechanics and Engineering

2003

Vol. 8, no spec.

277-282

The paper introduces the exploitation of a surveying system which automatically follows the peak value of pyromagnetic effect, including the hardware of a single chip processor, a set of servo-mechanism etc., and the system software of data collecting program, data handler etc. Using it, breaking tension test under various strain-rate on PVC sheet samples with distributed micro-bores is conducted. The magnetic induction sensor automatically follows the peak value of magnetic induction density. The experimental results show that the exploitation of the surveying system is successful. During the rapture process of rheological material PVC sheet with defects, owing to the existence of internal temperature gradient leads to the occurrence of pyromagnetic effect in the fracture process zone at crack tip.

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.