応力緩和における見掛けの非線型粘弾性

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It is generally known that linear amorphous polymer keeps a linear viscoelasticity for normal measurement (e.g. without large deformation, or without very low temperature etc.). In statical stress relaxation experiment by the specific adjustment, however, it is found that such amorphous polymer shows an apparently non-linear behavior. The problem with the specific adjustment here is how to adjust the zero point before the measuring, and so the method is devided into two classes. Both the adjustments (called method A and method B) indicate quite different non-linear theological behaviors. Method A: the zero point is adjusted with a sample fixed with the upper clamp in the upper part, only using the adjusting weight (rider). After adjusting the zero point, the sample is setted with the lower clamp, then the measurement of relaxation is started without readjustment of the zero point. method B : the sample is set previouslly with lower clamp and the zero point is adjusted with the upper clamp only using the adjusting weight (rider). then the sample is setted with the upper clamp, and the measurement is started. In both method (A and B), as readjustment of the zero point is not made before starting measurement, the zero point will shifft a little to the left hand (in the method A) or the right hand (in the method B) when the sample is completely fixed. Assuming that these shifted values are each δ_a or δδ_b, the correspondence between the real zero point and the apparent zero point is tabulated as follows. [table]
社団法人日本材料学会の論文
1966-05-15

応力緩和における見掛けの非線型粘弾性

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