Amagnesium oxide component must not fail when a tensile stress of 10.5 mpa is applied. determine the maximum allowable surface crack length if the surface energy of magnesium oxide is 1.0 j/m2. the modulus of elasticity of this material is 225 gpa.

Maximum permitted surface crack length is 1.29 mm

Explanation:

As per the question:

Tensile stress,

Surface energy of magnesium oxide, SE =

Modulus of elasticity of the material, E = 225 GPa =

Now,

To calculate the maximum allowable surface crack length:

the displacement produced by the body.  

the amount of force subjected to the body.  

the angle between the direction of force and displacement