problem_set5 - Materials 101 Introduction to Structures and...

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Materials 101 Introduction to Structures and Properties Winter 2010 Problem Set 5 Due: Tuesday, Feb. 23, 2010 8:00 am 1. Brittle Fracture 1.1 Callister Problem 8.5 A s p e c i m e n o f a 4 3 4 0 s t e e l a l l o y w i t h a K c = 54.8 MPa m 1/2 is exposed to a stress of 1030 MPa. Will this specimen experience fracture if it is know that the largest surface crack is 0.5mm long? Why or why not? Assume that the parameter Y has a value of 1.0. 1.2 Callister Problem 8.7 Suppose that a wing component on an aircraft is fabricated from an aluminum alloy that has a K c = 26 MPa m 1/2 . It has been determined that the fracture occurs at a stress of 112 MPa when the maximum internal crack length is 8.6 mm. For this same component and alloy, compute the stress at which facture will occur for a critical internal crack length of 6.0mm. 1.3 Callister Problem 8.9 C a l c u l a t e t h e m a x i m u m i n t e r n a l c r a c k l e n g t h allowable for a Ti-6Al-4V alloy component that is loaded to a stress one half of its yield strength (=910 MPa). For this alloy K
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problem_set5 - Materials 101 Introduction to Structures and...

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