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Unformatted text preview: MASSACHUSETTS INSTITUTE OF TECHNOLOGY DEPARTMENT OF MECHANICAL ENGINEERING CAMBRIDGE, MASSACHUSETTS 02139 2.002 MECHANICS AND MATERIALS II HOMEWORK # 6 Distributed : Wednesday, April 14, 2004 Due : Wednesday, April 21, 2004 Problem 1 A fatigue crack growth test was done on a compact tension specimen of a hard (HRC=60) tool steel. A table of respective values of stress intensity factor range, K I , and correspond- ing fatigue crack growth rates, da/dN , are given in the table. da/dN (mm/cycle) 4 . 26 10 6 9 . 12 10 6 1 . 75 10 5 3 . 51 10 5 K I ( M P a m ) 6 . 84 8 . 76 10 . 35 13 . 3 Plot these points on log-log coordinates (over a suitable range!) and graphically esti- mate values of the Paris-law fitting constants A and m that describ e fatigue crack growth in this material according to da = A ( K I ) m . dN Be sure to give appropriate units!...
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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
- Mechanical Engineering