鋼のクリープとその試験法

抄録

The author feviewed the present situation of the creep testing and the knowledge about. creep characteristics of steels. At first, the author stated that among the so-called the first, the second, and the third stages of creep, the second one or the steady state creep would show an inflection period from the transient creep to the accerelating period. Several long term creep test results showed this idea to be true. In the past days, short time creep testing had been mostly carried out in Japan, there were, however, many reasons to prefer the long term test, and the Japan Society for the Mechanical Engineers and'the Japan Society of Testing Materials are now going to specify the procedures for conducting the long period, high sensitivity creep test and creep rupture test. Several precautions in regard to testing machines, loading apparatus, selection of the extensometer and the temperature control equipment were resumed.
Applications of the creep data for thelengineering design had been introduced by several authors, among the so-called mechanicalequation of state advocated by Hollomon and.Lubahn, the master rupture curve of Larson and Miller and their reltd literatuewer.9 introduced in some details. In conclusion, the author cited important problems to be solved theoretically or experimentally in relation to the creep of steels.