The Role of Strike Marks on the Reproducibility of Charpy Impact Test Results

TL;DRAbstract

Charpy V-notch specimens from one lot of high-strength steel were tested using three machines to determine reference values for three measures of toughness: absorbed energy, lateral expansion, and height of shear lips. The broken specimens were examined to determine the location and magnitude of changes in specimen features made during testing. The features of interest were the height and location of the shear lips, the location of the lateral expansion projections ranked by height, and the location, length, width, and angle of the first- and second-strike marks. Changes in these features were compared to the changes in average absorbed energy for each of the machines in its standard condition. To correlate changes in these features with intentional machine modifications, ten series of tests were made on a fourth machine. Patterns which could predict the direction of change in absorbed energy for most modifications were observed. The trends indicated by these data are: (1) each modific

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