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This paper contains the results of the notched impact bending test compared with Charpy impact bending test. The specimen used is a cylinder notched around the circumference and the impact was given at two points at both sides of the notch. The effects of the notch were principally tested, and furthermore to test whether this two points impact system is practically applicable or not as the impact bending test, carbon steel specimens heattreated were tested and compared with the Charpy test. As the testing apparatus, the Charpy impact tester was used with a new pendulum of two points impact shown in Fig. 1. The dimension of the specimen is shown in Fig. 2. In doing the experiment, the uniformity of the material was especially considered and annealed in a vacuum furnace. Fig. 3, 4 and 5 shown the notch effect, and Fig. 6 shows the effect of the heat treatments. From the results of the experiment it was found that if the Mesnager type specimen is employed as the standard only slightly changing the dimensions of the notch ; this new type of two points impacts test can be substituded for the Charpy test with better results. In this case the authors recommend a specimen with an external diameter of 10 mm and an effective diameter of the section at the bottom of the notch of 7・5 mm. This new type of cylindrical specimen can be more easily made and set for testing compared with Charpy or Izod type. Further more as the amount of the shearing stress against the normal stress induced during the test is larger than that of the Mesnager type, this new type is more sensitive to the influence of the dimension of the notch, testing temperature and impact velocity etc. compared with the Mesnager type.
社団法人日本材料学会の論文
1957-03-15

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