電磁変換式粘弾性測定器の試作 : レオロジー一般

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Electromagnetic Transducers, known as Fitzgerald's apparatus, have been widely used in the measurement of dynamic mechanical properties of high polymers. The resonance dispersion in crystalline polymers can only be found by using this apparatus. We have constructed the twin type electromagnetic transducers, following the same principle. An alminium tube with two coils at both ends is suspended in a magnetic field by eight wires. A pair of disk-shaped specimens is inserted between the tube and a floating mass. When the alternating current is passed through one coil, the specimens are sheared. The electrical impedance of the other coil is measured by a high precision bridge. The mechanical impedance of specimen can be calculated from the difference of electrical impedance measured with specimens and without specimens. The complex shear modulus or compliance is obtained from the mechanical impedance. The plot of the electrical transfer impedance of tube is smooth over a frequency range from 50 to 8000 cps, though a small peak occurs at about 9000 cps. The value of transducer constant K^2, which related the electrical impedance to the mechanical impedance, has been determined to be 1.1×10^5 ohms dynes sec/cm. In order to obtain the two effective figures in the value of the complex shear modulus, the measurement with electrical bridge in the precision of five effective figures is necessary. The temperature of apparatus should be kept constant to the accuracy of 0.1℃. The complexity of calculation needs the use of electric calculating machine. The preliminary experiments on plasticized polyvinyl chloride and irradiated polyethylene have been carried out over a frequency range of 100 to 6000 cps.
社団法人日本材料学会の論文
1961-05-15

電磁変換式粘弾性測定器の試作 : レオロジー一般

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