ASTM E23-12 Notched Bar Impact Testing of Metallic Materials

ASTM E23-12 Notched Bar Impact Testing of Metallic Materials

These test methods explain the Charpy (simple-beam) and Izod (cantilever-beam) tests for notched-bar impact testing of metallic materials. The importance of notched-bar impact testing and procedures for evaluating the center of the strike are standard test methods in ASTM E23-12. The values expressed in SI units are considered standard.


    The standard test method of ASTM E23-12 tells about the behavior of metal when subjected to a single application of a force resulting in multi-axial stresses associated with a notch, coupled with high rates of loading and, in some instances, high or low temperatures, is the subject of these impact testing procedures.


    In ASTM E23-12, a suitable specimen, a set of anvils, and specimen supports on which the test specimen is placed to receive the blow of the moving mass, a moving mass with sufficient energy to break the specimen placed in its path, and a device for measuring the energy absorbed by the broken specimen are the essential features of an impact test.

    Specimen size:

    The testing machine is of robust structure, like a pendulum, and built to conform to the requirements annually. Charpy impact machines is checked directly and indirectly.

    Perpendicularity between notch axis and specimen edge is 62° and Angle of notch is 61°.

    Finish requirements Ra= 2μm on notched surface and opposite face


    h = S (1 – cos (β))

    h1 = S (1 – cos (α))


    h = initial elevation of the striker, 

    S = length of the pendulum distance to the center of strike, 

    β = angle of fall,

    h1 = height of rise, m, and

    α = angle of rise.


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