Geometric Parameters Specified in GB/T 229-2007 and Machining Methods of Charpy V-notch impact specimens

In the new impact test standard of current GB/T229-2007, the geometric parameters of Charpy V-notch impact specimens of are greatly different from the old version issued in 1994. Through comparison and analysis of geometric parameters for new and old standard and for ASTM E23-02a and impact test report, it can be recognized that relaxation and stipulation on the geometric parameters of impact specimens by GB/T 229-2007 is more scientific and rational. Machining methods of the Charpy V-notch impact specimens are compared and it is confirmed that the combined machine tool will be the development direction for machining impact specimens.