Modelling expansion of balloon

OliScott · May 31, 2019, 19:38

Dear all,

I want to use the solid mechanics tools in Openfoam Extend 4.0 to model a balloon expanding to determine how to make our device. The balloon has water either side of it - as the water outside is drawn back the balloon expands and the water inside is drawn in, and vice versa. If the balloon is too thin it breaks as the water is being drawn in. Neither do we want it too thick for various reasons. Hence I want to determine the stress/strain in this balloon to determine the material and thickness we need to make for it to work.

I need to model the point when the balloon is being expanded, drawing fluid inside. Can anyone give me any advice on how to setup this case please? Is it possible to just model the rubber balloon itself? If so is the elasticNonLinTLSolidFoam solver most appropriate? Or is it necessary to include the fluid in the simulation?

Many thanks!

karachun · June 3, 2019, 04:48

Pressure load is enough.
You should be familiar with hyperelastic material models and know parameters of your rubber. You can search on databases like Matweb.
https://www.academia.edu/32416590/An...stic_Materials
https://caeai.com/blog/tips-tricks-f...stomers-part-1
https://caeai.com/blog/tips-tricks-f...stomers-part-2

May 31, 2019, 19:38	Modelling expansion of balloon	#1
OliScott New Member Oli Join Date: Dec 2018 Posts: 1 Rep Power: 0	Dear all, I want to use the solid mechanics tools in Openfoam Extend 4.0 to model a balloon expanding to determine how to make our device. The balloon has water either side of it - as the water outside is drawn back the balloon expands and the water inside is drawn in, and vice versa. If the balloon is too thin it breaks as the water is being drawn in. Neither do we want it too thick for various reasons. Hence I want to determine the stress/strain in this balloon to determine the material and thickness we need to make for it to work. I need to model the point when the balloon is being expanded, drawing fluid inside. Can anyone give me any advice on how to setup this case please? Is it possible to just model the rubber balloon itself? If so is the elasticNonLinTLSolidFoam solver most appropriate? Or is it necessary to include the fluid in the simulation? Many thanks! Last edited by OliScott; June 1, 2019 at 13:18. Reason: Adding picture

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June 3, 2019, 04:48		#2
karachun Senior Member Join Date: Nov 2015 Posts: 244 Rep Power: 11	Pressure load is enough. You should be familiar with hyperelastic material models and know parameters of your rubber. You can search on databases like Matweb. https://www.academia.edu/32416590/An...stic_Materials https://caeai.com/blog/tips-tricks-f...stomers-part-1 https://caeai.com/blog/tips-tricks-f...stomers-part-2