Buckling behavior of a double-layer cylindrical shell under uniform axial pressure
In order to study the buckling performance of double-layer(DL)stainless steel cylindrical shells under uni-form axial compression,three DL cylindrical shells with nominally identical are designed,fabricated,and measured.The length-to-diameter ratio of all cylindrical shells is 1.7.In this paper,the load-displacement curve and ultimate strength of cyl-indrical shells are obtained by axial compression test.The arc length method is used to analyze the nonlinear buckling beha-vior of cylindrical shells,therefore,the equilibrium curve and critical load are obtained and compared with the test results.In addition,the imperfection-sensitivity of DL cylindrical shells is studied by numerical analysis.Furthermore,a theoretical equation for evaluating the load-bearing capacity of DL cylindrical shells is derived.The results reveal that the average ulti-mate strength of DL cylindrical shells is approximately 1.85 times higher than that of single-layer(SL)cylindrical shells.DL cylindrical shells are imperfection-sensitivity structures.The imperfection-sensitivity of the DL cylindrical shells is consist-ent with the imperfection-sensitivity of inner shells.Moreover,the imperfection-sensitivity of DL cylinders decreases with the increase in length-to-diameter ratio.The results of the test,numerical,and theoretical approaches are highly consistent.
万方数据
维普
