Glossary

Phase Angle δ

The phase angle δ is a relative measure of the viscous and elastic properties of a material.It ranges from 0° for a fully elastic material to 90° for a fully viscous material. It can be considered the “degree of fluidity”.  

Sinusoidal graph depicting applied shear deformation (black line) and material stress response (red line), highlighting phase angle (δ) and period (T).
Sinusoidally oscillating shear StrainStrain describes a deformation of a material, which is loaded mechanically by an external force or stress. Rubber compounds show creep properties, if a static load is applied.strain over time (t). The black and red solid lines represent the applied shear deformation and the material response (StressStress is defined as a level of force applied on a sample with a well-defined cross section. (Stress = force/area). Samples having a circular or rectangular cross section can be compressed or stretched. Elastic materials like rubber can be stretched up to 5 to 10 times their original length.stress) with a phase angle (δ), respectively. The black arrow illustrates the period (T).
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