On the Repeated Tension Impact Test of Carbon Steels

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In this experimental research, 0.097-0.82% carbon steels were studied under the repeated tension impact test. We made the experiment using the universal repeated impact testing machine, and further with the charpy impact testing machine beyond the limits of the capacity of the former.From the result of the tests, it may be said that the repeated tension impact test discontinuously changes from impact test to fatigue test. In the diagram of the relation between repeated tension impact energy and number of impacts to failure, two curves came out as shown in Fig. 4 and Fig. 5, and they were discontinuous. The fracture of specimens was cap and cone on one curve, and on the other, fatigue fracture. By measuring the deformation of specimens, we knew the change of α, β and ψ with the impact energy as shown Figs. 7. 8 and. 9.
社団法人日本材料学会の論文