Experimental and numerical research on buckling behavior of helically stiffened cylindrical shells
In order to investigate the buckling behavior of helically stiffened cylindrical shells under uniform external pressure,two sets of helically stiffened cylindrical shells and unstiffened cylindrical shells were fabricated,geometrically measured,and hydrostatically tested.Secondly,based on the measured initial geometric imperfections,nonlinear numerical analyses were carried out for the samples.The numerical analyses were in good agreement with the experimental results.Fi-nally,the effects of the ratio of the length of the cylindrical shell to the pitch of the rib(length-to-pitch ratio)and the cross-sectional type of the rib on the buckling load of the helically stiffened cylindrical shell were studied.The results indicate that helically stiffened can achieve a 52.6％ultimate load gain for cylindrical shell.The buckling load of helically stiffened cyl-indrical shell increases with the increase of length-to-pitch ratio,but it is greatly affected by the amplitude of imperfections.Compared with the rectangular section and I-shaped section,the helical rib with L-shaped section has the best buckling load improvement effect,with a maximum increase of 14.6％.
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