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Dynamic 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.
Viscoelasticity 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:
Storage and loss modulus
The 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 . 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:
|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.|