How to obtain Allowable Shear Stress

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  • #3
minger
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If not specified directly by your materials reference, a general rule of thumb is that the theoretical ratio between shear and tensile stress for a homogeneous, isotropic material is 0.577.
 
  • #4
FredGarvin
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you are looking in terms of yield strength, the max shear stress theory and max distortion energy theory help.

Max shear stress: Ssy=.5Sy
Distortion-Energy theory: Ssy=.577Sy
 
  • #5
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Thanks everyone.
I get the answers 0.5X, right ^_^.

Btw, I wonder what's the effect of Heat Treament on SAE-4340/ any steel. for example Quenching.

What's the multiply factor on Yield and ultimate strength?
 
  • #6
FredGarvin
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If you look in Machinery's Handbook, there is a nice section relating steel hardness to a relatively accurate form of estimating tensile properties. When you heat treat something, usually a Rockwell or some other hardness is mentioned as a requirement.

In my latest copy (26th edition) it starts on page 473-474.

My company did some internal testing quite some time ago with a lot of different alloys and found a relatively good relationship between the two parameters. The Machinery's section is pretty good.
 

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