ISO 18437-6:2017 機械的振動と衝撃—粘弾性材料の動的機械的特性の特性評価—パート6：時間と温度の重ね合わせ | ページ 6

3.1

dynamic visco-elastic function

fundamental visco-elastic property, i.e. storage moduli and loss moduli, measured in tension, shear and compression and loss factor as functions of frequency and temperature

3.2

storage modulus

M′

real part of the complex modulus

Note 1 to entry: It is a measure of the energy stored and regained during a loading cycle.

Note 2 to entry: Storage moduli in tension, shear and compression are denoted as E′, G′ and K′, respectively.

Note 3 to entry: It is expressed in pascals (Pa).

[SOURCE:ISO 472:2013, 2.998, modified — Notes to entry have been added.]

3.3

loss modulus

M′′

imaginary part of the complex modulus

Note 1 to entry: It is a measure of the energy lost (dissipated) during a loading cycle.

Note 2 to entry: Loss moduli in tension, shear and compression are denoted as E′′, G′′ and K′′, respectively.

Note 3 to entry: It is expressed in pascals (Pa).

[SOURCE:ISO 472:2013, 2.559, modified — Notes to entry have been added.]

3.4

loss factor

tan δ

ratio of the loss modulus (3.3) to the storage modulus (3.2) measured in tension, shear, compression or longitudinal compression

Note 1 to entry: It is given by the quotient tan δ = M′′/M′_.

[SOURCE:ISO 472:2013, 2.557, modified — the definition has been revised.]

3.5

time-temperature superposition

TTS

principle by which, for visco-elastic materials, time and temperature are equivalent to the extent that data at one temperature can be superimposed upon data taken at different temperature merely by shifting the data curves along the logarithmic time axis

Note 1 to entry: In case of dynamic measurements, the term “frequency-temperature superposition” would be more accurate, but is less commonly used. The term “method of reduced variables” is also used to refer to this principle.

[SOURCE:ISO 18437‑2:2005, 3.3, modified — “frequency axis” has been replaced by “logarithmic time axis” and Note 1 to entry has been added.]

3.6

thermorheologically simple material

material for which time-temperature superposition (3.5) is applicable

Note 1 to entry: A material which fails to superimpose, due to multiple transitions or crystallinity is, for example, thermorheologically complex.

Note 2 to entry: In thermorheologically complex systems, all relaxation times at a certain temperature may not be simply related to the relaxation times at a different temperature by a constant ratio. Thus, a multiphase system is thermorheologically complex if the individual shift factors (3.7) depend on time as well as temperature.

3.7

shift factor

measure of the amount of shift along the logarithmic (base 10) axis of frequency for one set of constant-temperature data to superimpose upon another set of data

Note 1 to entry: The expression “shift factor” commonly refers to horizontal shift factor.

[SOURCE:ISO 18437‑2:2005, 3.4, modified — Note 1 to entry has been added.]

3.8

vertical shift factor

measure of the amount of shift along the logarithmic (base 10) axis of modulus to account the effect of a change from reference temperature to the temperature of interest

3.9

master curve

curve constructed by time-temperature superposition (3.5) , which is identical to the behaviour of material that would be found (measured) at broad frequency range at the reference temperature if the experiment can be performed