Effect of Deflection Rate on the Notch Toughness of Mild Steels:A simplified method to judge the notch-sensitivity of materials (No.4)

概要

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In order to specify the notch toughness of steels the authors recently proposed the adoption of the criterion : φ=(maximum load)/(maximum load-point deflection) at room temperature on the notched slow bending test. In this report the behaviors of φ under three kinds of deflection rates were investigated, using the V-type standard charpy specimens, in connection with the notch toughness of materials. As the results of this experiment, the behaviors of φ were found as follows: (a)φ value remains constant within certain temperature range into which room temperature is included. (b) The larger deflection rate causes the transition temperature and φ value of material to be higher. And thus the larger φ value is connected with the higher transition temperature. Consequently the presumption of the notch toughness of materials by φ value in the notched slow bending test could be substantiated in the case of various deflection rates.
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