A glass plate is subjected to a tensile stress of 40 MPa. If the specific surface energy is 0.3 J/m2 and the modulus of elasticity is 69 GPa, determine the maximum length of a surface flaw that is possible without fracture.

The maximum length of a surface flaw is 8.24 μm

8.24 μm

Explanation:

Given that:

The modulus of elasticity E = 69 GPa

The specific surface energy = 0.3 J/m²

The length of the surface flaw "a" = ??

From the theory of the brittle fracture;

Making a the subject of the formula; we have:

a = 8.24 × 10⁻⁶ m

a = 8.24 μm

Thus; the maximum length of a surface flaw is 8.24 μm

answer:

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