The tensile strength of brittle materials may be determined using a variation of Equation 8.1. Compute the

Question:

The tensile strength of brittle materials may be determined using a variation of Equation 8.1. Compute the critical crack tip radius for a glass specimen that experiences tensile fracture at an applied stress of 70 MPa (10,000 psi). Assume a critical surface crack length of 10-2 mm and a theoretical fracture strength of E/10, where E is the modulus of elasticity?