modelling composite thermoplastic

[varun]

Hi,

I am modelling a HDPE liner impregnated with steel ribs, I am modelling a small cross section of 18 mm of this liner with this steel rib in between.
How it must be modelled,
whether viscoelatic model must be used or not?
and if yes how this condition can be modelled in Ansys Workbench 11.
I need to know at what load this liner will have a 5% deflection of its diameter. If anyone can please help me out.

With Regards

Varun

[Jorgen]

Unfortunately there is not exact answer to your question. There are different ways to model the HDPE liner that will give results with different accuracy. The most appropriate approach to use will depend on how accurate you need your results to be, and how much time (and money) you are willing to spend to get the results.

Can you provide more info?

-Jorgen

[varun]

Actually if I am modelling the HDPE liner with a structural steel ribs, is the time dependent behaviour of HDPE to be considered as major work of providing stiffness will be done by Steel. I am only interested only in stiffness and any deformation in the direction of the axis of this liner is of no interest.

[Jorgen]

OK, sound good.

[varun]

So what do you think, applying creep behaviour of HDPE is necessary here or not?

[Jorgen]

I personally would include the considerations of the creep behavior in order to be safe.

-Jorgen

[varun]

Thankyou Jorgen,
I am modelling this in Ansys Workbench 11, which doesnot allow modelling creep behaviour, so can you guide me how to transfer the model from Ansys workbench to Ansys and than apply creep behaviour. Well it can be done using saving the file from Ansys Wrokbench in parasolid and than reading it in Ansys. But my model is an assembly so will transferring file in this way work.

With regards,

Varun

[Jorgen]

Unfortunately I don't use Ansys enough to provide accurate instructions for the transfer :o

Best of luck,
Jorgen