高張力鋼(50kg/(mm)^2 級)変質部の切欠き疲れ強さに関する研究

概要

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In the previous paper (1), experimental results were reported about the effect of a notch at the H.A.Z. in mild steel for fatigue fracture. By analysing the test data, it was known that the ε_0 value, an important measure of notch sensibility to fatigue fracture, was constant and about 0.05mm In this paper, the value of ε_0 was investigated for the H.A.Z. in a high tensile steel of 50kg/(mm)^2 class. Testing method and specimen shape were the same as in the previous report for the mild steel. The hardness levels of H.A.Z. were controlled from 290 to 400 Vickers for notched specimens. Their fatigue strengths were compared with the ones for non-notched specimens, which were also controlled in the similar range of hardness level by using an apparatus to reproduce synthetic welding thermal cycle. The experiment revealed that the value of ε_0 was also about 0.05mm for H.A.Z. in the high tensile steel, regardless of the hardness level and notch sharpness.
社団法人溶接学会の論文
1963-04-25