Two definitions of material dissipation factor

In summary, material dissipation factor, also known as loss tangent or tan delta, is a measure of energy loss in a material when subjected to an alternating electric field. It is represented by the ratio of the material's imaginary permittivity to its real permittivity. It can be measured using various techniques, such as dielectric spectroscopy and impedance spectroscopy, and is affected by factors such as temperature, frequency, and moisture content. It has two definitions: the ratio of energy loss to stored energy and the ratio of resistive to reactive components. Material dissipation factor is commonly used in electrical engineering and material science for designing and testing components and studying dielectric properties.
  • #1
senmeis
69
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TL;DR Summary
material dissipation factor
Hi,

I have seen two versions of definitions of material dissipation factor Df:

The first one:
Dk (dielectric constant) = K = relative permittivity = ɛ -jɛ’ , ɛ = energy stored and ɛ’ = energy lost.
Df (dissipation factor/loss tangent) = ratio of ɛ’ and ɛ

The second one:
On slide 8 of webinar http://www.globalcommhost.com/roger...17_JC_microstrip_coplanar_stripline_final.pdf:
The imaginary component of complex permittivity is Df (dissipation factor).

Which one is correct?
 
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  • #2
The first definition is correct. Regarding the second one, I think it's just a sloppy formulation.
 

1. What is material dissipation factor?

Material dissipation factor, also known as loss tangent, is a measure of the energy lost as heat during a cyclic deformation of a material. It represents the ratio of the energy dissipated to the energy stored in a material during each cycle of deformation.

2. What are the two definitions of material dissipation factor?

The two definitions of material dissipation factor are the mechanical definition and the electrical definition. The mechanical definition is based on the ratio of the energy dissipated to the energy stored in a material during mechanical deformation. The electrical definition is based on the ratio of the energy dissipated to the energy stored in a material during electrical deformation.

3. How is material dissipation factor measured?

Material dissipation factor can be measured using various techniques such as dynamic mechanical analysis, dielectric analysis, and viscoelastic spectroscopy. These techniques involve applying a cyclic deformation or an alternating electric field to the material and measuring the resulting energy dissipation.

4. What factors affect the material dissipation factor?

The material dissipation factor is affected by factors such as temperature, frequency of deformation, and the type of material. Higher temperatures and frequencies typically result in a higher dissipation factor, while stiffer materials tend to have a lower dissipation factor.

5. What is the significance of material dissipation factor?

The material dissipation factor is an important parameter in understanding the energy loss and heat generation in materials, which can affect their performance and durability. It is also used in the design and testing of materials for various applications, such as in the automotive and aerospace industries.

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