Effects of the striking edge radius of the Charpy impact test on the absorbed energy and the abrasion of the striker were investigated. The absorbed energy of the 8mmR was higher than that of the 2mmR when the absorbed energy was above 200N-m. The cause of this difference is that the bending deformation of the test specimen and the friction between the anvil and the test specimen are large in case of the 8mmR. The abrasion of the 8mmR striker was extremely large and it is too difficult to maintain the radius dimension according to ASTM E 23.
The effectiveness of fatigue strength improvement methods, namely TIG-dressing and hammer peening, were examined using out-of-plane gusset welded joints of high strength steel (SM570). In addition, the mechanism of each improvement method was discussed with respect to the decrease in stress concentration and residual stress at the weld toe. Finally, various methods for improving the effectiveness of these fatigue strength improvement methods are proposed.
The effects of the striking edge radius of the Charpy impact test on the absorbed energy and lateral expansion were investigated. The effects of the changes of the length of test specimens and effects of symmetry of test specimens was also investigated. The absorbed energy of the 8mmR's was higher than the 2mmR's as in the study by Naniwa et al.[1]. For every machine tested, the absorbed energy was higher when the striking point did not contact the specimen opposite the notch. The effects of the length of test specimens were larger when the asymmetric test specimens were tested.
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