電縫鋼管の座屈に関する実験的研究

Abstract

An experimental study is made of the buckling phenomena of a circular welded tube of highstrength steel. Main emphasis is on the effect of residual stresses and plastic working in the pro-duction process, on the buckling strength. A test specimen has a cross-section of 101 .6q~ x 2.9t.Some specimens are annealed and others as-delivered. It is found that the magnitude of re-sidual stresses goes up to 70% of the yield point stress, and a considerable gradient is observed inthe residual stresses in the radial direction across the thickness. Experimental results agree wellwith the theory which takes account of the effect of both residual stresses and plastic working.