Calculate plastic zone - fatigue crack propagation mechanism, Mechanical Engineering

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Calculate plastic zone:

Calculate plastic zone ahead of crack in above problem if σY = 250 MPa.

Solution

From Eq.

924_Calculate plastic zone.png

Here KI is taken as KI max since the plastic deformation will be caused by higher stress, s_max.

∴ r_Y= [70√∏a]² / 2∏aσ²y= (4900a xP )/(2Px (350)² ), a =70/2 =35mm

= 4900 x35 /(2x350x350) = 0.7 mm

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