システムトラス球継手の疲労強度改善に関する研究

概要

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This system truss has the mechanism to induce the high bolt clamping force Thus, the initial clamping force reduces the stress range in the bolt under applied cyclic loads and so improves the fatigue life Moreover, to improve the fatigue properties of space trusses, this paper describes the fatigue tests of the single-bolt joints of system trusses conducted on actual connection models The test variables are the size (M30, M42), the manufacturing process (rolling and machining) and the stress ratio of the joining bolt And, for practical applications, the results are presented the S-N diagrams described by the stress range and the fatigue limit diagram As a result of the tests, the bolt produced by thread rolling after the heat treatment has the better safety against fatigue than that produced by thread rolling before the heat treatment, thread machining and so on There is remarkable difference in the fatigue limit by the stress ratio of the joining bolt produced by thread rolling after the heat treatment And the fatigue design formula can be led from the lower bound by which the 95% confidence level was shown.
2002-12-30