Simulation of a polymer flow under compression between two glasses.

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  • Last Post 14 February 2020
vikrambathala4 posted this 12 February 2020

Hello,

 

I am trying to simulate the polymer flow under compression between two glasses at different temperatures(room temperature to melting points), I have a DMA test data of the polymer at different temperatures and frequency sweeps.(like Loss modulus, Storage modulus, Viscosity and Phase lags).

and I am stuck up with the following questions.

 

 

 

I know that Visco-elastic material consists of both Solid and liquid properties, if the phase lag between storage modulus and loss modulus is close to zero then it is more of a solid, and if it close to 90, it is more of an liquid. But my polymer material has a phase angle of 40 at 240 degree C.

I confused that whether I should consider my polymer as a very soft viscous elastic solid or thick Viscous fluid ? how to decide

Which solver should I use

1. Should I use the Ansys mechanical and model the polymer as solid visco-elastic material. Then, can I use the DMA data for fitting the coefficients of material models.

 

2. Should I use the Ansys Polyflow to model the polymer as non Newtonian fluid and inputting the viscosity data I got from the DMA test at different temperature for the fluid model.

 

Any solution would be appreciated.

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bducoeur posted this 14 February 2020

Hello,

As you are in between fluid and solid, you will make an assumption.  You might need to use two different solftware depending you are more on the solid state or on the fluid state.  If you consider it is fluid, I would recommend using Polyflow as you can do pressing of viscoelastic material.

In the following section of the help :

https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/prod_page.html?pn=Polyflow&prodver=20.1&lang=en ,you have the possibility to download “Polyflow Example Files”

Example 40, 80, 81, 87, 109, 120, 124 are dealing with pressing

If you want to include viscoelastic behavior, you can find useful information here:

https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v201/en/poly_pm/poly_pm.html

and here :

https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v201/en/poly_pm/pm_ug_sec_guidelines_pressing.html

Example 3, 15, 16, 24, 28, 39, 41, 45, 51, 62, 67, 72, 73, 74, 88, 90, 99, 100, 103, 105, 106 are dealing with viscoelastic.  Not necessary with pressing but pressing and viscoelastic can be combined.

Best regards,

Benjamin

vikrambathala4 posted this 14 February 2020

Thanks

 

Benjamin

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