A material has a shear modulus of 7.65 GN/M^2. When a solid body of this material is subject to a hydrostatic pressure of 1GN/M^2, its volume decreases by 5%. The Poisson's ratio is 0.33, and the young’s modulus =20.4GN/M^2. The strain energy release rate is 0.5kl/m^2, which gives a critical rate of 3.383MNm^-3/2.

A bar of this material of square section side 80mm is subject to a load of 100kn. Estimate the size of sharp surface flaw that is just; large enough to cause catastrophic failure. Use a finite width correction factor y=1.12

Question

A material has a shear modulus of 7.65 GN/M^2. When a solid body of this material is subject to a hydrostatic pressure of 1GN/M^2, its volume decreases by 5%.  The Poisson's ratio is 0.33, and the young’s modulus =20.4GN/M^2. The strain energy release rate is 0.5kl/m^2, which gives a critical rate of 3.383MNm^-3/2. 

A bar of this material of square section side 80mm is subject to a load of 100kn. Estimate the size of sharp surface flaw that is just; large enough to cause catastrophic failure. Use a finite width correction factor y=1.12