A component is made from a wide steel alloy plate It has a p

A component is made from a wide steel alloy plate. It has a plane-strain fracture toughness of 83.8 MPa Squareroot m. If the plate is exposed to a tensile stress of 350 MPa during service use, what is the minimum length of a surface crack that will lead to failure? (Assume Y = 1.0.)

Solution

assuming Y=1

The equation used is K= Stress*sqrt(pi*c) where c is the length of crack

K= 83.8 MPa, stress 350 MPa

(83.8/350)^2 = pi*c

c = .01825 m, or 18.25 cm