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Shear Stress vs Tensile Stress

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Shear Stress vs Tensile Stress

Relationship between Shear stress and tensile Stress

Ultimate Tensile Strength = Su, Ultimate Shear Strength = Ssu, Tensile Yield Strength = Syp, Shear yield point = Ssyp
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

References: Machine design Theory and Practice .A.D.Deutschman, W.A Michels & C.E. Wilson.. MacMillan Publishing 1975.
Machinery's Handbook 27 th ed.

Note: 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...

Links containing Strength of Metals Information
  1. Copper Development Association ...Large quantity of information on copper
  2. ...Lots of information on a large range of materials