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HW_CH_9 - IE 320 Spring 2003 Homework Ch 9 Introduction to...

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Homework Ch. 9 2 Introduction to Materials Science 9.1 Cite at least two situations in which the possibilityof failure is part of the design of a component or product. 9.7 The tensile strength of brittle materials may be determined using a variation of Equation 9.1b. Compute the critical crack tip radius for an Al2O3 specimen that experiences tensile fracture at an applied stress of 275 MPa. Assume a critical surface crack length of 2 x 10 -3 mm and a theoretical fracture strength of E/10, where E is the modulus of elasticity. 9.18 Suppose that a wing component on an aircraft is fabricated from an aluminum alloy that has a plane strain fracture toughness of 40 MPa m. It has been determined that fracture results at a stress of 365 MPa when the maximum internal crack length is 2.5 mm. For this same component and alloy, compute the stress level at which fracture will occur for a critical internal crack length of 4.0 mm.
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3 Introduction to Materials Science 9.28 Briefly explain why BCC and HCP metal alloys may experience a ductile-
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