The fatigue life of a certain steel was found to be 10* cycles at + 70 MPa and 10 cycles at + 50 MPa. A part made from this steel was given 10" cycles at + 61 MPa. If the part were then cycled at + 54 MPa what would be its expected life?
The fatigue life of a certain steel was found to be 10* cycles at + 70 MPa and 10 cycles at + 50 MPa. A part made from this steel was given 10" cycles at + 61 MPa. If the part were then cycled at + 54 MPa what would be its expected life?
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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Transcribed Image Text:The fatigue life of a certain steel was found to be 104 cycles at + 70 MPa and
10° cycles at + 50 MPa. A part made from this steel was given 10 cycles at +
61 MPa. If the part were then cycled at + 54 MPa what would be its expected
10.
life?
306
MECHANICAL BEHAVIOR OF MATERIALS
700
600
500
Figure 17.33. S-N curve for a SAE 4140
steel.
4140 steel
400
300
102
103
104
105
106
107
N, cycles to failure
100
7075-T6 aluminum
R= 0
10
0.1
0.01-
10
20
50
100
AK, MPavm
Figure 17.34. Crack growth rate of 7075-T6 aluminum for AK = 0. Data from C. M. Hudson, NASA TN D-5300,
1969,
da/dN, um/cycle
Stress, MPa
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