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8/20/2019 Slide 5 Fatigue FrctMech Appr
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Fatigue Analysis usingFracture Mechanic
ApproachProf. Ir. Eko Budi Djatmiko, M c., PhD.!ur yahroni, "., M"., Ph.D.
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T e
k n i k
K e
l a u
t a n
F T K -
I T S
8/20/2019 Slide 5 Fatigue FrctMech Appr
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Fatigue crack propagationtest
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2mall # medium
scale specimen
$arge scale specimen
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Fatigue crack propagationtest
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Fatigue crack %eha&ior
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• 'egion I(• fatigue)threshold• *racks do not
propagate if + K I + K th• 'egion II(
• sta%le fatigue crackpropagation -F*P
• apply Paris la/
• 'egion III(• 0nsta%le F*P
•
8/20/2019 Slide 5 Fatigue FrctMech Appr
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'egion I( fatiguethreshold+ K th can %e predicted(• '23.4(
• + K th 5 6.7-4)3.89' ksiin 4:;
• + K th 5
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'egion II( ta%le F*P• Martensitic steels (
• A "M A947, A "M A94< >rade F, A "M A9?? >radeB, *lass 4, A "M A9?? >rade A, # A "M A679
•
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'egion II( ta%le F*P• Ferrite-Pearlite steels (
• A "M A?6, AB )*, A?3;)B, A9?
8/20/2019 Slide 5 Fatigue FrctMech Appr
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'egion II( ta%le F*P• Austenitic stainless steels (
• AI I ?37, ?39
•
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8/20/2019 Slide 5 Fatigue FrctMech Appr
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E@ect of mean stress or stressratio
• R 5 P min :P maA 5K min :K maA
•
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8/20/2019 Slide 5 Fatigue FrctMech Appr
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Design e ample
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10
8/20/2019 Slide 5 Fatigue FrctMech Appr
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8/20/2019 Slide 5 Fatigue FrctMech Appr
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Design e ample
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Design e ample
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Design e ample
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Design e ample
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Design e ample
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Design e ample
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