Storage modulus and phase angle

Mathematically, it is defined as the ratio of stress (σ) to strain (ε) amplitude multiplied by the cosine of the phase angle (δ): The storage modulus is frequency-dependent and typically increases with increasing frequency. The strain of a viscoelastic body is out of phase with the stress applied, by the phase angle, d. Rheology is used to describe and assess the deformation and flow behavior of materials. Oil, honey, shampoo, hand cream, toothpaste, sweet jelly, plastic materials, wood, and metals – depending on their physical. All you have to do is tell the app how closely (or not) the response to an oscillating force follows the stimulus.