A cylindrical acetal polymer bar 64 cm long and 1.27 cm in diameter is subjected to a vibrational (tension) load at a frequency of 501 vibrations per minute with a load of 4,849 N. How many hours will the part survive before breaking? Use stress = force/area and WATCH YOUR UNITS!!

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
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A cylindrical acetal polymer bar 64 cm long and 1.27 cm in diameter is subjected to a vibrational (tension) load at a frequency of 501 vibrations per minute with a load of 4,849 N. How many hours will the part survive before breaking?  Use stress = force/area and WATCH YOUR UNITS!!

 

Stress amplitude (MPa)
60
50
40
30
20
10
1
1
104
105
106
Cycles to failure
107
108
Transcribed Image Text:Stress amplitude (MPa) 60 50 40 30 20 10 1 1 104 105 106 Cycles to failure 107 108
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Can you explain this part please?  How you got  412.72?

Stress = force/area 

Stress = 4849 (N)π412.72 (mm2)

Stress = 38.29 MPa

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