ASTM E647 − 13a Measurement of Fatigue Crack Growth Rates

ASTM E647 − 13a Measurement of Fatigue Crack Growth Rates

The determination of fatigue crack growth rates from near-threshold to maximum controlled instability is covered by this test procedure. This test is essentially dependent on the magnitude of the fatigue crack growth rate that is measured during the procedure.

    Scope:

    To determine the impact of fatigue crack propagation on component life when subjected to cyclic loads. The data is created in a realistic environment and combined with statistics on fracture toughness. To set material selection and inspection guidelines damage-tolerant applications must meet certain requirements.

    Procedure

    This test method comprises cyclic loading of notched specimens that have been precracked in fatigue to an acceptable degree. The size of the crack is determined visually or via an equivalent method approach, based on the number of fatigue cycles elapsed, and this data are subjected to numerical analysis in order to determine the crack rate growth. The rate of crack propagation is represented as a function of the range of stress-intensity factors. 

    Specimen size

    The size of the specimen is variable and must be adjusted for yield strength and applied force.

    Data

    The crack-tip (∆K) value is used to express the results specified by the theory of elasticity.

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