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Calculated based on the cohesion force suggest that the tensile strength of glass should be 10...

Calculated based on the cohesion force suggest that the tensile strength of glass should be 10 GPa. However, a tensile strength of only 1.5% of this value is found experimentally. Griffith supposed that this low value was due to the presence of cracks in the glass. Calculate the size 2a of a crack normal to the tensile direction in a plate.

Given: Young’s Modulus E = 70 Gpa

Surface tension Ye=0.5 J/m^2

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