Static_Failure_2 - Ductile Material Failure •Yielding...

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Unformatted text preview: Ductile Material Failure •Yielding occurs when the distortion strain energy per unit volume reaches the strain energy per unit volume for yield in simple tension 2 / 1 2 1 3 2 3 2 2 2 1 2 ) ( ) ( ) (                     2 / 1 2 2 2 2 2 2 2 ( 6 ) ( ) ( ) (                   zx yz xy x z z y y x           For pure shear?? Y S    Y S 577 . max   How? Yielding criterion 1-Distortion Energy Theory (DE): von Mises 2-Maximum Shear Stress (MSS): Tresca • Yielding occurs when the maximum applied shear stress becomes equal to the shear stress at yielding • Slip lines are formed at 45 deg of the axis of tension  1 >  2 >  3  2=  3=0  =  /2  1=  What if all stresses are equal?   y y S S    3 1 m ax 2    ys S For uniaxial stress Yielding criterion        23 1 23 2 2...
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Static_Failure_2 - Ductile Material Failure •Yielding...

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