On Sun, 21 May 2006, Gerhard Fiedler wrote:

> Peter wrote:
>
>> Try to find the stress limit of the material (using a vise ?) and then
>> using the vehicle mass at the time of the impact and assuming an impact
>> you could work out something that may or may not reflect the (minimum)
>> speed.
>
> I think using this method without quite some real-world data points is not
> likely to get me close. There are too many variables that probably are
> researched /somewhere/, but not anywhere I would have found it.

I think that if you look at how a Brinnell hardness measurement works 
you will find clues.

Peter
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