Inspection
Work Planning
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The progressive structural damage that occurs when a material is subjected to repeated or cyclic loading.
Fatigue is the gradual initiation and propagation of cracks within a material caused by repeated cyclic stresses that are below the material's ultimate tensile strength. Over time these cracks grow until the remaining cross-section can no longer support the applied load, resulting in sudden fracture. Fatigue is one of the most common failure mechanisms affecting rotating equipment, welded structures, piping systems and pressure-containing components.
Fatigue assessment is essential for predicting equipment life, preventing unexpected failures and supporting inspection, design and fitness-for-service evaluations.
Fatigue damage depends upon stress range, loading frequency, material properties, geometry, surface condition and environmental influences rather than simply the magnitude of a single applied load.
Fatigue is a specific Failure Mechanism caused by repeated cyclic loading and should not be confused with overload failure resulting from a single excessive load.
Materials Engineering; Mechanical Integrity; Reliability Engineering.
Structural integrity.; Rotating equipment.; Pressure equipment.; Life assessment.; Failure investigations.
ASME BPVC Section VIII Division 2
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