Mechanical Testing - Notched Bar or Impact Testing - TWI
The current British Standard for Charpy testing is BS EN ISO 148-1:2009 and the American Standard is ASTM E23. The standards differ only in the details of the strikers used. The standard Charpy-V specimen illustrated in Fig.1. is 55mm long 10mm square and has a 2mm deep notch with a tip radius of 0.25mm machined on one face.