高級鋳鉄管の疲労強度に関する研究
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概要
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The authors had carried out the static and the fatigue tests of high grade cast iron pipe materials to study the causes of the accidents of water supply and distribution pipes of high grade cast iron, to find out remedies for them, and to get some data for fatigue design of pipes. The test pieces used were taken out from the actual pipe bodies of three kinds in axial direction, that is from the pieces of the ruptured pipe and the unused ones manufactured in 1935 and 1954 respectively. The tests performed were divided into the following two groups : (I) Concerning with the unused pipes manufactured in 1935 and 1954, the static tests and the fatigue ones under the pulsating stress +1kg/mm^2〜σ^<max> were carried out with the test pieces taken from the pipe body near the socket, the middle and the spigot part. (II) Concerning with the unused pipes manuactured in 1935 and 1954, and with the ruptured pipe, the static tests and the fatigue ones under the repeating stresses taken as +1kg/mm^2〜+σ^<max>, +6kg/mm^2〜+σ^<max> and -σ^<max>+σ^<max> were carried out with test pieces taken from the pipe body near the socket. Main results obtained are summarized as follows : (1) The fatigue strength σ^<2 000 000> of the test pieces taken out from the socket were higher about 11・5〜38・5 than that of the one from the spigot. (2) Comparing with the others, the strengths of the ruptured pipe specimens used in these experimental researches showed a little falling. But, we can not suppose that the ruptured accident may occurs due to such falling. (3) Static strength of ruptured pipe showed 84・2% of that of unused pipe manufactured in the same year, and, the pulsating fatigue strength at n=2×l0^6 showed 83.3%. (4) According to the classification of ASTM, all sereies belong to type A of graphite flake type chart, while the ruptured pipe and the unused one manufactured in 1935 belong to size 4 and the pipe in 1954 belong to size 5 of graphite flake size chart, respectively. (5) The graphite flake size of the ruptured pipe was too coarse in comparison with the other pipes to emphasize the notch effect. This fact seems to behave as a cause of the lower fatigue resistance of the ruptured pipe. (6) The authors obtained the time strength diagram for fatigue design of high grade cast iron pipes to be used for water works.
- 社団法人日本材料学会の論文
- 1958-12-15
著者
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