Hi there,(adsbygoogle = window.adsbygoogle || []).push({});

For my Final Year Project at University I am analysing Road Restraint Systems/Safety Barriers in a Finite Element Analysis package.

My problem is calculating the force exerted onto the barrier by a vehicle during a collision, more specifically the time over which this impact occurs.

Using d (this distance over which the impact occurs) isn't an option as this is an unknown that is calculated during the analysis.

What I've got so far...

E=1/2mv^{2}

Momentum = mv=2E/v

Momentum = F. delta t = 2E/v

Therefore, F = 2E/v.delta t

What I really need is an assumed value of delta t from past numerical or field tests. I've searched for journals with such information with no luck. Failing that a method or idea how else to calculate the force exerted on the barrier from a vehicle.

Any help would be greatly appreciated.

Regards,

Frostie

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Impulse and Impact time of a collision

**Physics Forums | Science Articles, Homework Help, Discussion**