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The cohesive strength of a brittle material is 25 GPa. Assuming that fracture occurs when local stress at the crack tip reaches cohesive strength of
The cohesive strength of a brittle material is 25 GPa. Assuming that fracture occurs when local stress at the crack tip reaches cohesive strength of the material, calculate the nominal fracture stress of the material containing crack of 5 m length with radius of curvature at the crack tip of 0.25 nm. What would be the nominal fracture stress is the crack is blunted by drilling holes of diameter 0.2 m at the crack tip? Comment on the results (5 points)
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