# How to measure the force generated by a tyre when it fails?

Hello everyone,

I am trying to work out how much force is generated when a tyre fails at a certain pressure. The tyre will be inside an OSHA section 1910.177 compliant tyre cage.

What calculation would be used to solve the following?:

The tyre size is 35 x 11.5-17 with a rated inflation of 255 psi.

Maximum supply available to the tyre is 300 psi.

I need to know what force/shockwave/energy is released if the tyre were to fail inside the cage.

Worst case scenario is the tyre sidewall splits with all stored pressure/energy being released in one direction.

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Chestermiller
Mentor
The tire fails when the strength of one of the materials contained within the tire construction is exceeded. This is characterized by the state of stress within the material at the failure pressure. An analysis of the stress distribution within the tire structure can be carried out to establish the state of stress at a given pressure.

jrmichler
Mentor
A couple thoughts:

There is a volume of air at a pressure inside the tire. The energy in that volume of air at that pressure can be calculated. All of that energy is released suddenly when the tire blows. If you are not familiar with the calculations, google energy in compressed air. The expansion will be adiabatic.

If a hole blows in the tire, the escaping air is short lived rocket engine. Google rocket thrust calculator to learn more. One of the good hits is NASA. The pressure drops rapidly, so the easiest way to find the velocity of the tire is by using a numerical solution.

Or you can simply google exploding tires and watch a few videos. You can estimate forces from the damage shown.

Thank you both for your input.