大形平板試験片によるHT80鋼のLBB挙動に関する研究

概要

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The leak before break (LBB) behavior of pipings and pressure vessels is quite important in a nuclear or chemical plant. If a component cannot be broken under the most critical conditions but a leakage occurs at a limited part of the system, then no more protection systems to prevent pipe-whip accidents after a break are necessary and sufficient repair can be done before a catastrophic accident breaks out. In this study, discussion was made to clarify the leak or break conditions of a structual steel (HT 80). Relatively large specimens with various surface flaws were tested by a 200 ton hydraulic tensile machine, operating at about 0.07 Hz, applying axial stresses to the specimens in air at room temperature. The results showed that LBB conditions were slightly dependent on initial crack size and that a crack extention was remarkably slow during the period between leak and failure.
一般社団法人日本機械学会の論文
1988-05-25