The Traffic Accident Reconstruction Origin -ARnews-

Re: Need help on rear-end collision with articulated vehicle.

Ed Phillips (edphill@aol.com)
Thu, 20 Nov 1997 19:50:06 -0500 (EST)

A plot of this dynamic would be most helpful. Here's my first thoughts. Why should the truck-trailer driver be hurt instead of the Nissan driver? The primary force is acting through the trailer and Nissan. If the Nissan displaces post-impact 88 ft. at 0.56 thats a 38.4 mph post-speed. If it is fair to assume a collinear nature (probably not) that's a speed change of 20.6 mph from the 59 mph impact speed. The truck-trailer would have a much lower delta v. Newton 3.

The 100 ms time is for fixed barrier collisions, and your thread implies the trailer is acting like a rolling "fixed" barrier. So I should think it a reasonable application for the Nissan, and therfore the truck-trailer. I don't know anyone can really help unless you can tell us more about the nature of the injuries and the t-t driver position when struck. Also does he have some hx for low back injuries.

Newer F-250's should have well padded seats. How did you solve this for impact speeds? Sounds like a good deal of work finding the c.g. and post-motion for the t-t. Sounds like an interesting Physics problem. Oh, yeah, why the big friction variation pre and post for both vehicles?

Ed

Ed Phillips
edphill@aol.com

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