**IS0 3219-1**:2021 Rheology 一 Part 1: Vocabulary and symbols for rotational and oscillatory rheometry.

3.30

rheopexy

rheopectic behaviour

reversible, time-dependent increase of shear viscosity i (L42) at a constant shear rate y (3.33) or shear stress r (141)

3.31

rotational speed

rotational frequency n

number of rotations per unit time

Note 1 to entry: The rotational speed n has the SI unit reciprocal seconds (s’), in practice It is often given in reciprocal minutes (min’).

3.32

rotational test

test where both shear planes of the measuring geometry are rotating relative to each other around the same axis of rotation

3.33

rotational test with controlled (shear) rate rotational test with CR

rotational test where the shear rate y (138) is given as a function of time t

Note 1 to entry: In case there is no absolute measuring geometry (see ISO 3219-2) used, it is a speed-controlled rotational test (3.32).

3.34

rotational test with controlled (shear) stress rotational test with CS

rotational test where the shear stress z (141) is given as a function of time t

Note 1 to entry: In case there is no absolute measuring geometry (see ISO 3219-2) used, it is a torque-controlled rotational test (3.32).

3.35

shear compliance

I

ratio of shear deformation j’ (14) and shear stress r (141)

Note ito entry: The shear compliance) is the reverse of the shear modulus G(3.31). Note 2 to entry: The shear compliance) has the unit reciprocal pascal(Pa’).

3.36

shear loss modulus

viscous shear modulus

G

measure of the viscous behaviour (3..5_4) of a viscoelastic material

Note ito entry: The shear loss modulus C” has the unit pascal (Pa).

Note 2 to entry: The shear loss modulus G” is the imaginary part of the complex shear modulus G.

3.37

shear modulus

G

ratio of shear stress r (3A1) and shear strain y (140)

Note I to entry: The shear modulus C has the unit pascal (Pa).IS0 3219-1 pdf download.