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Fatigue, Shakedown, Ratcheting for ASME Code

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Fatigue, Shakedown, Ratcheting for ASME Code

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    1. Fatigue, Shakedown, Ratcheting for ASME Code

    2. Stabilized Cycle in Component

    3. Strain Range

    4. Cyclic Curve

    5. Twice-Yield (2xY) for EP-FEA Input Loading=Load range Stress strain law=cyclic stress range-strain range Output Stress components=stress range components Strain components=strain range components

    6. Fatigue Damage Use calculated strain range at critical location Get allowed cycles from strain-based design fatigue curve Determine fatigue damage for each cycle

    7. Role of Plastic Shakedown Refers to advancement of hysteresis loop at a point Not a failure mode Only required to justify use of strain-based fatigue curve

    8. Plastic Shakedown Example

    9. Ratcheting Refers to incremental growth of gross dimensions Is a global failure mode

    10. Ratcheting Check Not needed for only primary loading that meets static loading requirements Needed for cyclic thermal loading plus primary loading with a mean

    11. Cone Cyl Junction

    12. Plastic Shakedown Check Not required if ratcheting check passes Reason: Advancement of hysteresis loop cannot be sustained

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