he flexural (or fracture) strength of brittle materials may be determined using a variation of Equation 8.1. Compute the critical crack tip radius (row sub t in nm) for an Al2O3 specimen that experiences tensile fracture at an applied stress (sigma initial) of 275 MPa. Assume a critical surface crack length (a) of 2 * 10^-3 mm and a theoretical fracture strength of E/10, where E is the modulus of elasticity (393 GPa). Note, fracture will occur when sigma sub m reaches the theoretical fracture strength of the material. given equation:  sigma sub n = 2*sigma initial*sqrt(a/row sub t)

Elements Of Electromagnetics
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The flexural (or fracture) strength of brittle materials may be determined using a variation of
Equation 8.1. Compute the critical crack tip radius (row sub t in nm) for an Al2O3 specimen that
experiences tensile fracture at an applied stress (sigma initial) of 275 MPa. Assume a critical surface
crack length (a) of 2 * 10^-3 mm and a theoretical fracture strength of E/10, where E is the
modulus of elasticity (393 GPa). Note, fracture will occur when sigma sub m reaches the theoretical
fracture strength of the material.
given equation:  sigma sub n = 2*sigma initial*sqrt(a/row sub t)

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