*SHEAR TEST DATA

Using shear test data to define a viscoelastic material

Optional parameters

SHRINF

To specify creep test data, set this parameter equal to the value of the long-term, normalized shear compliance $j_{S} (\infty)$ .

To specify relaxation test data, set this parameter equal to the value of the long-term, normalized shear modulus $g_{R} (\infty)$ . The shear compliance and shear modulus are related by $j_{S} (\infty) = 1 / g_{R} (\infty)$ . The fitting procedure will use the specified value in the constraint $1 - \sum_{i = 1}^{N} {\bar{g}}_{i}^{P} = g_{R} (\infty)$ .

Data lines to specify creep test data

First line

Normalized shear compliance $j_{S} (t)$ . $(j_{S} (t) \geq 1)$
Time t. $(t > 0)$

Repeat this data line as often as necessary to give the compliance-time data.

Data lines to specify relaxation test data

First line

Normalized shear relaxation modulus $g_{R} (t)$ . $(0 \leq g_{R} (t) \leq 1)$
Time t. $(t > 0)$

Repeat this data line as often as necessary to give the modulus-time data.