Fatigue Analysis Problem Solution : Basquin's Law
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FATIGUE ANALYSIS : PROBLEM 6.9 SOLUTIONMUHAMMAD JOSHUA YB1406563866DEPARTMENT OF METALLURGY AND MATERIALS
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APPLICATION OF BASQUIN’S LAW
= constant• ≈ cycles
0.07 < b < 0.13
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QUESTION
Cyclic fatigue of an aluminum alloy showed it failed under a stress range σ = 280 MPa after 105 cycles, and for a range 200 MPa after 107 cycles. Using Basquin’s law, estimate the life of
the component subjected to a stress range of 150 MPa.
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SOLUTION 1
• 1 = 280 • 2 = 200• 1 = • 2 =
= (
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=
= (
= b
= 0.073
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• = 150 Mpa ; Nf ?
= = 5 X 10^8 Cycles
= constant = 648.775
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SOLUTION 2
•
• Jika A dan b diketahui
∆𝜎 (𝑁𝑓 )𝑏
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• Sf = 200 ; Nf = 10^7• A = Sf / • = 200 / 10^(7 x -0.117)• = 1318.3
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• Sf = 150 MPa; Nf = ?
• = 1.2 x 10^8
• Note : Result difference due to the differences of laboratory condition fatigue limit and nature condition fatigue limit
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REFERENCES
• Meyers, Marc . 1998. Mechanical Behavior Of Materials , Second Edition . Cambringer.• ocw.mit.edu, lecture’s Notes• Institute technology Of India, lecture’s Notes (Ocean
Structures Engineering)• Smallman , R.E. 1998 . PHYSICAL METALLURGY And
ADVANCED MATERIAL ENGINEERING. Prentice Hall.