loss tangent

symbol: $\tan \delta$
synonym: loss factor
https://doi.org/10.1351/goldbook.12783
Tangent of the phase angle (\(\delta\)) between stress and strain during a forced sinusoidal oscillation.
Note: \(\tan \delta\) is also equal to the ratio of loss modulus to storage modulus.
Source:
PAC, 2013, 85, 1017. (Glossary of terms relating to thermal and thermomechanical properties of polymers (IUPAC Recommendations 2013)) on page 1032 [Terms] [Paper]
Citation: 'loss tangent' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.12783 RIS BibTex EndNote
Div. IVTextXMLJSON