Rheological storage modulus unit

What is a storage modulus?

The storage modulus is the elastic modulus, stiffness, or Young’s modulus that describes the elastic energy stored in the material during deformation.

What is the difference between loss modulus and storage modulus?

The storage modulus G' (G prime, in Pa) represents the elastic portion of the viscoelastic behavior, which quasi describes the solid-state behavior of the sample. The loss modulus G'' (G double prime, in Pa) characterizes the viscous portion of the viscoelastic behavior, which can be seen as the liquid-state behavior of the sample.

Why is a complex modulus higher than a storage modulus?

In both cases the complex modulus would be higher, as a result of the greater elastic or viscous contributions. The contributions are not just straight addition, but vector contributions, the angle between the complex modulus and the storage modulus is known as the ‘phase angle’.

Why do viscoelastic solids have a higher storage modulus than loss modulus?

Viscoelastic solids with G' > G'' have a higher storage modulus than loss modulus. This is due to links inside the material, for example chemical bonds or physical-chemical interactions (Figure 9.11). On the other hand, viscoelastic liquids with G'' > G' have a higher loss modulus than storage modulus.

What is complex shear modulus G*?

with complex shear modulus G* (G star, in Pa), shear-stress amplitude τ A (in Pa), and strain amplitude γ A (dimensionless, or expressed in %). G* describes the entire viscoelastic behavior of a sample and is called the complex shear modulus G*.

Which product has the smallest storage moduli?

Similarly, the hotdog and tofu products display the smallest storage moduli, including animal hotdog with 13.5 kPa, plant-based hotdog with 11.9 kPa, extrafirm tofu with 11.0 kPa, and firm tofu with 5.7 kPa. Theoretically, for isotropic materials, the storage modulus relates to the Young’s modulus or elastic stiffness as , where is Poisson’s ratio.