耐熱合金鋼15-15N厚肉円筒の高温における内圧破壊強度

概要

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In this report shown are the test results of short-time bursting of thick-walled tubes of a heat-resisting alloy, 15-15N, subjected to internal pressure at high temperatures up to 700℃. The diameter ratio of the test tubes are from 1.75 to 7. The experimental bursting pressures are compared with the estimated pressures by several well-known design formulae. The appearances of burst tubes are also examined. The results obtained are as follows : (1) Among the formulae proposed for room temperature, the formulae by Manning and by MacGregor et al. are not quite applicable to the high temperature range in spite of tedious calculations. (2) The experimental values yields a linear relationship in the ultimate pressure-ln (diameter ratio) plots, and Faupel's formula gives a good agreement with the experimental results. (3) The crack initiates at the inside tube wall and propagates toward the outer part to cause bursting of tube. The appearance of burst surface at the cross-section indicates cleavage or shear fracture for the tubes of small diameter ratio. For the tubes of larger diameter ratio the cleavage fracture produced at the inside surface transforms into the shear type which propagates along the outward logarithmic spiral direction from the top of a large cleavage crack.
社団法人日本材料学会の論文
1973-03-15