What Is The Impact Strength Of Sheet Metal Used In The Construction Of Automobiles?
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I am trying to find out what the impact strength is of sheet metal used in the manufacturing of automobiles.
like 3′x3′x6″
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It depends. There are many different types of steel used in autos and none of them are used in the dimensions you list. THe mechanical properties of steel (and all metals) depends on exactly what the alloy composition is and, particularly with steels, they also depend on how the particular piece of steel was processed and heat treated. Even a very simple steel alloy can have a wide range of physical properties just depending on how it was cast, how it was processed (forged, rolled, hot worked vs cold worked, etc) and how it is heated (was it cooled slowly, quickly or very quickly, was it reheated to an intermediate temperature and, if so, for how long). Steel is used for so many different things because it’s properties can be changed and controlled to serve many different applications. The science of metals (metallurgy) is a very interesting thing.
If you are talking about brittle fracture as measured by a Charpy impact test. Most steel used in an automobile might not pass a Charpy test but due to the fact that it is very thin means it is not likely to brittle fracture.
One fairly good measure of impact resistance is grain size. If the grain size is smaller that an ASTM grain size of 5, there is very little likely hood of brittle fracture.