Cylinders are primary components of civilian and naval marine structures and may be subject to impulsive loads that can induce a dynamic buckling response. This paper presents a comparative nonlinear finite-element numerical study of the effects of impulse time duration on the dynamic buckling response of a cylinder. The case of combined hydrostatic and impulsive pressures is also investigated to study the effects of an impulsive load on the buckling stability of a submerged cylinder. Dynamic buckling behavior is established by monitoring the nonlinear growth of initial shape imperfections in the finite-element models. The results show that the predominant harmonics and amplitudes of response are affected by the time duration of the pulse, tending towards the static buckling response with increased pulse duration. The combined hydrostatic and impulsive pressures produce significantly greater buckling deformations than either produce on their own, indicating that design against buckling stability, where impulsive loads are possible, should not consider the static and dynamic components independently.

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