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November 28, 2011 Forensic Engineering No Comments

Crash Test: Head-On Collision

1962 Cadillac and 2002 Cadillac

 

This video has good technical information which is unfortunately not presented in a scientific manner related to the head-on impact between a 1962 Cadillac Sedan de Ville and 2002 Deville at 50 miles per hour.

From an analytic and forensic engineering analysis perspective there is a great deal of very relevant safety-related documentation in this type of crash test.

This crash test conclusively shows that modern cars are much safer than older classic cars regarding crumple and crush zones, in addition to seat attachment to body integrity issues which are visibly shown in the video.

The information is good but you will have to survive the presentation.

 

httpv://www.youtube.com/watch?v=O-WYKYrq5FI&feature=player_embedded”>

Europe Test Crash of Ford Focus at 120 MPH

 

Focus Immediately Before Impact

Focus Immediately Before Impact

The European TV show Fifth Gear had the Transportation Research Laboratory (TRL) crash a Ford Focus at 120 mph.

This staged crash test represents a worst case collision scenario where the car impacts a rigid, non-deformable, barrier.

After impact you will see the non-flammable Stoddard Test Fluid coming out of the fuel tank. The test fluid is put there to test fuel tank physical integrity.

 

Here are calculations associated with 40 mph and 120 mph collisions. The 120 mph collision has 9 times the energy of a 40 mph collision.

 

Note that with this equation the energy goes up with the square of the speed, which means that there is 4 times as much energy at 40 mph than 20 mph (40×40= 1600 and 20×20=400).

You can clearly notice that your car takes a lot longer to stop from 60 or 70 mph than from 40 mph because of the square the speed energy issue. To simplify the calculation some more, if you square 60 = 3600 and the square of 40 = 1600 so there is more than twice the energy at 60 than 40.

With 10 the square is 100 and 15 the square is 225. Auto crash testing is typically conducted at speeds up to 40 mph (40×40=1600). There is 16 times as much energy at 40 than 10.

Remember to drive safely. The reality associated with the math applies every time you get behind the wheel.

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