Why Does Failure Stress Depend on Material?

rmrramani
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why failure stress depend upon material instead of size and shape?
 
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allowable stresses are material and environmentally determined.

size, shape and loading determine the applied stress.
 
Due to the constant never ending supply of "cool stuff" happening in Aerospace these days I'm creating this thread to consolidate posts every time something new comes along. Please feel free to add random information if its relevant. So to start things off here is the SpaceX Dragon launch coming up shortly, I'll be following up afterwards to see how it all goes. :smile: https://blogs.nasa.gov/spacex/
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