What is the magnitude of the maximum stress that exists at the tip of an internal crack

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What is the magnitude of the maximum stress that exists at the tip of an internal crack having a radius of curvature of 2.5 × 10-4 mm (10-5 in.) and a crack length of 2.5 × 10-2 mm (10-3 in.) when a tensile stress of 170MPa (25,000psi) is applied?

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