Question

6. Si$_3$N$_4$ has a surface energy equal to 3 J/m$^2$, a Young's modulus of 350 GPa and an atomic spacing of 0.2 nm. Estimate the theoretical strength of this material. 7. The experimentally observed fracture stress of Si$_3$N$_4$ in tension is 550 MPa. Calculate the flaw size that would cause this failure stress, if the fracture toughness, K, of Si$_3$N$_4$ is 5 MPa m$^{1/2}$

          6. Si$_3$N$_4$ has a surface energy equal to 3 J/m$^2$, a Young's modulus of 350 GPa and an atomic
spacing of 0.2 nm. Estimate the theoretical strength of this material.
7. The experimentally observed fracture stress of Si$_3$N$_4$ in tension is 550 MPa. Calculate the
flaw size that would cause this failure stress, if the fracture toughness, K, of Si$_3$N$_4$ is 5
MPa m$^{1/2}$

$6. Si3N4 has a surface energy equal to 3 J/m^2, a Young's modulus of 350 GPa and an atomic spacing of 0.2 nm. Estimate the theoretical strength of this material. 7. The experimentally observed fracture stress of Si3N4 in tension is 550 MPa. Calculate the flaw size that would cause this failure stress, if the fracture toughness, K, of Si3N4 is 5 MPa m^1/2$

Added by Cole W.

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