ASTM E561-10 Standard test for K-R curve determination

ASTM E561-10 involves the resistance to fracture of metallic materials that is determined using one of the following notched and precracked specimens: the compact tension (CT) specimen or the middle cracked tension (MT) specimen. The values stated in SI should be considered as standard.

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    ASTM E561-10 keeps track of the toughness of a fracture as it is stably driven under increasing applied stress intensity factor K. The K-R curve can be matched with the crack driving curves for an untested shape to predict the degree of stable crack extension and the conditions required for unstable crack propagation.


    The growing crack extension resistance KR is equal to the applied stress intensity factor K during slow stable fracturing. Continuously or progressively increased force or displacement drives the crack ahead. The approach includes two methods for determining effective crack size: direct measurement of crack size and compliance measuring technique. 

    Specimen size:

    The specimen should be conditioned at ±0.5% of thickness.


    Secant slope can be calculated by using the following formula:

     (Δv/ΔP)I = (vi –vo)/Pi


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