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September 23, 2014

September 23, 2014

Posted by **Z32** on Thursday, October 8, 2009 at 1:04pm.

sigma' = sigma cos^2 θ = sigma(1+cos 2θ / 2)

and tau = sigma sin θ cos θ = sigma( sin2θ / 2)

- Engineering Materials -
**MathMate**, Friday, October 9, 2009 at 4:17pmThe equations given would apply to a particular case of plane stress condition where σx and σy are the principal stresses, thus the shear stress τxy is zero. Furthermore, σx equals zero, i.e. it is a case of uniaxial tensile or compressive stress.

The derivation of the general formula for the general case is presented in the classic work "Theory of Elasticity" by Timoshenko and Goodier (chapter 2 sec. 9) and is the basis of the Mohr's circle. Therefore, the same derivation will be found in many sources including web-pages.

Here's one place you may look:

http://www.efunda.com/formulae/solid_mechanics/mat_mechanics/plane_stress.cfm#transform

The Mohr's circle is a related subject that may eventually interest you, if not for the time being.

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