Find stress intensity factor - thick cylinder, Mechanical Engineering

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Find stress intensity factor - thick cylinder:

A thick cylinder of r_i = 10 mm, r₀ = 70 mm carried equal and symmetric radial cracks 6 mm long on opposite sides of inner surface. The inner surface is jacketed with a thin rubber membrane and pressurised with 2 N/mm² pressure. Find SIF.

Solution

r₀ / r_i= 70 /10 = 7; a / (r₀ - r_i) = 6 / (70 - 10) = 0.1

From Figure, for r₀ / r_i=7 and a / (r₀ - r_i) =0.1, Y= 0.46

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