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ASTM Standard Test Methods for Notched Bar Impact Testing of Metallic Materials (E 23) requires the face of the striker to have an 8 mm radius and to be 4 mm wide. At the corners where the 8 mm radius meets the sides of the striker, E 23 calls for a radius of 0.25 mm ± 0.05 mm. This 0.25 mm radius causes a problem, as it can be worn out of tolerance quickly during normal testing. This paper presents data which exhibits the effects on absorbed energy when the corner radius is enlarged. Data is also presented which compares absorbed energy obtained using an ASTM E 23, 8 mm striker with absorbed energy obtained using an ISO 2 mm striker.
Charpy impact test, impact test, striker, striker geometry
Manager, Engineering & Systems, Tinius Olsen Testing Machine Co., Inc., Willow Grove, Pennsylvania