Shear Stress and Tensile Stress
Ultimate Tensile Strength = Su, Ultimate Shear Strength = Ssu,
Tensile Strength Yield Strength = Syp, Shear yield point = Syp
The original data is based generally on the reference above and I have completed a very crude review to confirm the information. The copper information is however very suspect.
For copper the reference above gives a value of Ssu = Approx 0,9 x Su...On reviewing a number of copper alloys there is a wide spread from about 0,5 to 0,9 the 0.9 applied to one leaded brass cast alloy. I am tempted to remove copper from the table but as a very crude average I have simply changed the value to 0,65 please use with care or better still do not use.
Note: The relationships below are very approximate for use only as an rule of thumb estimate if no other source of information is available.
| Material |
Tensile-Relation |
Yield-Relation |
| Wrought Steel & alloy steel |
Ssu = Approx 0,75 x Su |
Ssyp = Approx 0,58 x Syp |
| Ductile Iron |
Ssu = Approx 0,90 x Su |
Ssyp = Approx 0,75 x Syp |
| Malleable iron -Pearlitic |
Ssu = Approx 1,0 x Su |
- |
| Wrought iron |
Ssu = Approx 0,83 x Su |
- |
| Cast Iron |
Ssu = Approx 1,3 x Su |
- |
| Copper / & alloys (See Note below) |
Ssu = Approx 0,65 x Su |
- |
| Aluminium / & alloys |
Ssu = Approx 0,65 xSu |
Ssyp = Approx 0,55 x Syp |
Machine design Theory and Practice .A.D.Deutschman, W.A Michels & C.E. Wilson.. MacMillan Publishing 1975
achinery's Handbook 27 th ed.
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