Tangent line of storage modulus graph

What is the ratio of loss modulus to storage modulus?

The ratio of the loss modulus to the storage modulus is defined as the damping factor or loss factor and denoted as tan δ. Tan δ indicates the relative degree of energy dissipation or damping of the material.

What is a storage modulus?

The storage modulus is a measure of how much energy must be put into the sample in order to distort it. The difference between the loading and unloading curves is called the loss modulus, E ". It measures energy lost during that cycling strain. Why would energy be lost in this experiment? In a polymer, it has to do chiefly with chain flow.

How do you find the tangent of a phase lag?

Clearly G∗ = 1/J ∗ G ∗ = 1 / J ∗ and vice-versa. The remaining fundamental quantity is the tangent of the phase lag, tan(δ) tan (δ), often simply called "tan delta" and sometimes called the "loss tangent". The in-phase and out-of-phase components of the dynamic modulus are known as the storage modulus and loss modulus, respectively.

What happens if loss modulus is greater than storage modulus?

If storage modulus is greater than the loss modulus, then the material can be regarded as mainly elastic. Conversely, if loss modulus is greater than storage modulus, then the material is predominantly viscous (it will dissipate more energy than it can store, like a flowing liquid).

What is storage modulus in tensile testing?

Some energy was therefore lost. The slope of the loading curve, analogous to Young's modulus in a tensile testing experiment, is called the storage modulus, E '. The storage modulus is a measure of how much energy must be put into the sample in order to distort it.

What are loss modulus and Tan() peaks?

he Tg measured from the loss modulus and tan(δ) are simply the temperature at the peak. The loss modulus peak occurs at a higher temperature than he Tg measured through E’/G’ onset and at a lower temperature t an the tan(δ) peak. Figure 2 shows the loss modulus and tan(δ) peak for polycarbonate. These peaks can be relativel