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My S4 survived a Hail Storm, Friends Acura TL did not

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Old 09-20-2010, 03:35 PM
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Default Thickness has a very significant effect on strength

Originally Posted by rcoppens
Thickness is not the issue......it is the spec of the hood.

usually, hoods are 1-1.5mm thick......but it is the spec of the material that will determine the resistance.

Not sure what Audi uses .... but likely a mild steel (possibly a bake hard or cold rolled 2 or 3) with a galv-anneal coating. Pretty standard, so likely you were in a lucky location.......
I don't know what the sheet metal thicknesses of the Audi and Acura are but, a 1.5mm thickness will resist bending 3.375(1.5 cubed)times the resistance of a 1 mm thick sheet of the same material. It would be interesting to know the relative thicknesses of the cars hoods and tops. This thickness vs strength is one of the major tradeoffs against weight.
Old 09-20-2010, 06:31 PM
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Pretty sure the hood is aluminum, not steel.
Old 09-21-2010, 10:09 AM
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Default Hood is steel-Tested with magnet

Originally Posted by westwest888
Pretty sure the hood is aluminum, not steel.
The hood material attracts a magnet. It would be nice if it were aluminum but it is not,
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