抄録
The standard creep limits are not yet determined in our country, and this report was made so as to give some contributions for its determination. Using the author's simple creep tester(9), 13 kinds of definitions for creep limits as in Table 1, were experimentally compared. The experiments were done with four kinds of metals as given in Table 2 and at temperatures between 300° and 700°. The creep diagrams obtained are shown in Figs. 2 to 19, and the creep limits were calculated as given in, Table 3 to 7, within the error of 1kg/mm2. The creep limits can be rearranged in the next numerical order, which shows the mean percentage by taking K W I No. 1 as 100%.
(1) Simidu No. 3 180% (6) Frank. Bureau Veritas 75%
(2) Mitubisi, Sunaga 120% (7) Sasagawa's & Engl. Hatfield's Method <50%
(3) Sumitomo and K W I No. 1 100% (8) Siebel & Ulrich's Method 80%
(4) K W I, No. 2, No. 3 95% (9) Juretzek and Sauerward's Method 90%
(5) Germany DVM
Swiss
Author.} 90%
From the point of view of accuracy and easiness of the experiment, the definitions in the groups (3), (4) and (5) are the most recommendable.
