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# Pneumatic Tyre Static Structure Analysis ( Need help on how to simulate the pressurize air in tyre )2

## Pneumatic Tyre Static Structure Analysis ( Need help on how to simulate the pressurize air in tyre )

(OP)
Dear All,

I need help on how to simulate pressurized air in tyre for static structure analysis.

My model has 4 bodies which are rim( structural steel), floor (concrete), rubber( rubber) and air.

I create body that represent air but when I try assigning material property to the body,and I push solve button, I got error saying that I need to define elasticity of the air.

Need pros and experts opinion, if there is any other way to just create air or what material property for air should I follow.

This project is part of my Master degree dissertation.

Attached is 3D data for your reference.

### RE: Pneumatic Tyre Static Structure Analysis ( Need help on how to simulate the pressurize air in tyre )

Why you dont apply pressure load to inner surface?

### RE: Pneumatic Tyre Static Structure Analysis ( Need help on how to simulate the pressurize air in tyre )

(OP)
Mr. Karachun,

Is what u mean is to apply pressure load to inner tyre and delete body that represent the air?

### RE: Pneumatic Tyre Static Structure Analysis ( Need help on how to simulate the pressurize air in tyre )

Yes. Apply some nominal pressure, run analysis, export deformed geometry, measure volume of deformed tire, recalculate pressure according to new volume, repeat. The idea is that pressure is constant at any point of tire at one time. Maybe you can start with some part of load, like 10% and incrementally calculate pressure and increase load on wheel axis.

### RE: Pneumatic Tyre Static Structure Analysis ( Need help on how to simulate the pressurize air in tyre )

Hi Shahril,

It may be worthwhile to look at acoustic elements to represent air. That way, the pressure is directly coupled to the deformed volume without need for looping. The element does make some assumptions such as small density change so it's worth understanding the limitations to see if it fits your requirements.

Kind regards,
Jason

### RE: Pneumatic Tyre Static Structure Analysis ( Need help on how to simulate the pressurize air in tyre )

I thought - when I pump the wheel in the car, at the end the pressure in the tire takes into account the load on the wheel, since the car is on the ground. If the tire pressure is given for a wheel standing on the ground and loaded with the weight of the structure, then the author can set this pressure and avoid using additional elements and loping. Shahril can compare two options - using acoustic elements and using pressure.

### RE: Pneumatic Tyre Static Structure Analysis ( Need help on how to simulate the pressurize air in tyre )

L_K's proposed hydrostatic fluid elements looks more promising than acoustic elements for tires.

#### Quote (karachun)

...then the author can set this pressure and avoid using additional elements and loping
karachun- Yes, while my intuition is the tire air pressure could increase as the car takes on heavy passengers and cargo. My assumption may be incorrect.

Kind regards,
Jason

### RE: Pneumatic Tyre Static Structure Analysis ( Need help on how to simulate the pressurize air in tyre )

Yes, in this case you are right.

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