A tensile sample of width 10mm contains an internal crack, Mechanical Engineering

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A tensile sample of width 10mm contains an internal crack

A tensile sample of width 10mm contains an internal crack of length 0.3mm. When loaded in tension the crack suddenly propagates when the stress reaches 450 MPa. What is the fracture toughness K_1c of the material of the sample? If the material has a modulus E of 200 GPa, what is its toughness? (Assume Y =1)

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Mechanical Engineering: A tensile sample of width 10mm contains an internal crack

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Mechanical Engineering: A tensile sample of width 10mm contains an internal crack

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