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本文用测量材料的周期性应力与应变相位差的方法来测量单端夹持样品的内耗,可得到单一频率的内耗温度谱。将相位法同强迫共振法测得的内耗温度谱相比较,两条曲线在Tg以下的低温端吻合较好,而在Tg以上的高温端有一定的差别。这与玻璃化转变后共振频率的漂移较大有关。
In this paper, we measure the internal friction of a sample with a single end by measuring the phase difference between the periodic stress and the strain of the material, and obtain the internal temperature spectrum with a single frequency. The phase method is compared with the internal friction temperature spectrum measured by the forced resonance method. The two curves agree well at the low temperature end below Tg, while there is a certain difference between the high temperature end and the high temperature end. This is related to the large shift of resonance frequency after glass transition.