Slide 5 Fatigue FrctMech Appr

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.

F a t i g u e

&

F r a c

t u r e

M e c

h a n i c s

( M O -

0 9 1 3 3 4 )

T e

k n i k

K e

l a u

t a n

F T K -

I T S


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Fatigue crack propagationtest

F a t i g u e

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t u r e

M e c

h a n i c s

( M O -

0 9 1 3 3 4 )

2mall # medium

scale specimen

$arge scale specimen


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Fatigue crack propagationtest

F a t i g u e

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M e c

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0 9 1 3 3 4 )

3


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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

•


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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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6


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'egion II( ta%le F*P• Ferrite-Pearlite steels (

• A "M A?6, AB )*, A?3;)B, A9?


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'egion II( ta%le F*P• Austenitic stainless steels (

• AI I ?37, ?39

•

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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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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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Design e ample

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M e c

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( M O -

0 9 1 3 3 4 )

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Slide 5 Fatigue FrctMech Appr

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