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Unformatted text preview: K I = 100 MP a m K I . After 60 , 000 cycles of the loading describ ed, the bar fractures, with failure due to a throughthickness edge crack of [failure] length a f = 14 mm , emanating from the tensile side of the bending stress eld. 1 The stress intensity factor for a rectangular beam containing an edge crack of length a and subjected to bending moment M can be expressed as K I = Q b a, where b is the peak tensile bending stress in the uncracked beam, subjected to bending moment M , and the conguration correction factor can be taken as constant, Q = 1 . 12, providing the relative crack depth a/w < . 3. Estimate the initial crack size, a i , that grew to cause the nal fracture. 2...
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This note was uploaded on 02/23/2012 for the course MECHANICAL 2.002 taught by Professor Davidparks during the Spring '04 term at MIT.
 Spring '04
 DavidParks
 Mechanical Engineering

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