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Yield stress in torque?!?

thread177-143792

Yield stress in torque?!?

Yield stress in torque?!?

(OP)
According to all that I found, The modulus of elasticity in torsion is about 60% of that in tension. (ASTM A229) Is the same true for the yield stress? And is there a way that I can find out this information. MATWEB is where I got all of my other information.

tseils
eServ LLC
www.eserv.biz

RE: Yield stress in torque?!?

The relationship between elastic moduli in tension and shear can be approximately 60%, but it is exactly:

G = E/2(1-ν)

You can read more here:

http://www.efunda.com/formulae/solid_mechanics/mat_mechanics/elastic_constants_G_K.cfm?search_string=elasticity

The same is not true for yield stress.  You need to review failure criteria like Tresca (Maximum Shear Stress) or von Mises (Distortion Energy) to understand the relationship between yielding in shear vs. tension.

You can read more here:

http://www.efunda.com/formulae/solid_mechanics/failure_criteria/failure_criteria_ductile.cfm?search_string=von%20mises

Regards,

Cory

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