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Dynamic modulusDynamic modulus is the ratio of stress to strain under vibratory conditions (calculated from data obtained from either free or forced vibration tests, in shear, compression, or elongation). It is a property of viscoelastic materials. Additional recommended knowledge
Viscoelastic lagViscoelasticity is studied using the dynamic mechanical analysis. Where we apply small oscillatory strain and measure the resulting stress:
Stress and strain in a viscoelastic material can be represented using the following expressions:
where
Storage and loss modulusThe storage and loss modulus in viscoelastic solids measure the stored energy, representing the elastic portion, and the energy dissipated as heat, representing the viscous portion [1]. The tensile storage and loss moduli are as follows:
Similarly we also define shear storage and loss moduli, G' and G''. Complex variables can be used to express the moduli E and G as follows: where See also
ReferencesCategories: Solid mechanics | Non-Newtonian fluids |
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Dynamic_modulus". A list of authors is available in Wikipedia. |