# Prony Series Conversion

This pdf-file summarizes a simple mathematical approach that can be used to determine the Prony series from dynamic storage and loss modulus data.

Relaxation modlus of ramp loading

Can you please help me out in calculation the shear relaxation Modulus for ramp loading equation by nano indentation method...

Just tell me the equations to be used for the calculation for ramp laod

Hi Jorgen,

Stumble across your site through google... What can I say, a most helpful site and it is motivating me to restart my experiment to design a elastomeric shock absorber.

Forgive me for asking, but can you provide examples or tutorials with actual data to illustrate how this can be done?

[QUOTE=Jorgen,37]This pdf-file summarizes a simple mathematical approach that can be used to determine the Prony series from dynamic storage and loss modulus data.[/QUOTE]

I am afraid that I dont have any tutorials to share 🙁

Best of luck,

Jorgen

see for example at [url] http://www.viscodata.de/ [/url]

viscodata program

Interesting document and useful for using it with MARC. I have one basic question. As I understand by this document that the master curve data ( E vs Time) generated at a reference temperature Tr , is used to generate the Pronys constants which are used in MENTAT along with the WLF constants, C1 and C2. This input, as I understand, will be good for any temperature, as far as the viscoelasticity part of the modeling is concerned. Is this correct?

If so, we will still have to model the material by, for examole, Ogden method, and the constants (moduli and exponents) which should be valid for any temperature.

Thanks.

Bhag

Yes, you will still need to use a hyperelastic model (e.g. the Ogden model). The linear viscoelasticity part only controls the viscous flow response.

If you want to predict the response at different temperatures you will still need to use a hyperelastic model that can handle different temperatures.

- Jorgen

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