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In a plate of aluminium alloy 7075 a central defect is present with a total length of 3 mm. a) Calculate the critical stress for fracture using the Griffith criterion and using Kic. b) Explain possible differences. Given: surface tension y,-1.14 10 mm Youngs modulus E 7x 104 N/mm2 fracture toughness Kic 1040 N/mm32 Answer a) Griffith ơ,-5.8 MPa. Kki Ơ,-479 MPa

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