The S-N diagram for a titanium alloy is shown in the figure. Calculate the fraction of life consumed by the following sequence of loadings: 15,000 cycles at 80 MPa 120,000 cycles at 60 MPa 3,500,000 cycles at 50 MPa Maximum stress (ksi) 160 140 120 100 80 60 40 20 10³ 10+ 10³ 10⁰ Cycles to failure 107

The S-N diagram for a titanium alloy is shown in the figure. Calculate the fraction of life consumed by the following sequence of loadings: 15,000 cycles at 80 MPa 120,000 cycles at 60 MPa 3,500,000 cycles at 50 MPa Maximum stress (ksi) 160 140 120 100 80 60 40 20 10³ 10+ 10³ 10⁰ Cycles to failure 107

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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A cylindrical 1045 steel bar (see the figure below) is subjected to repeated compression- tension stress cycling along its axis. If the load amplitude is 23,000 N, calculate the minimum allowable bar diameter (in mm) to ensure that fatigue failure will not occur. Assume a factor of safety of 2.0. Maximum stress, S (MPa) 700 600 500 400 300 200 100 0 4340 steel 104 Ti-5Al-2.5Sn titanium alloy 70Cu-30Zn brass EQ21A-T6 Mg alloy 105 1045 steel Ductile cast iron 107 2014-T6 Al alloy 108 10⁹ 106 Cycles to failure, N Data taken from the following sources and reproduced with permission of ASM International, Materials Park, OH, 44073: ASM Handbook, Vol. I, Properties and Selection: Irons, Steels, and High-Performance Alloys, 1990; ASM Handbook, Vol. 2, Properties and Selection; Nonferrous Alloys and Special- Purpose Materials, 1990; G. M. Sinclair and W. J. Craig, "Influence of Grain Size on Work Hardening and Fatigue Characteristics of Alpha Brass," Transactions of ASM, Vol. 44, 1952.
URGENT
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