标题： 杆件寿命的后期屈曲阶段是不可避免的吗？ 显示英文标题

标题： Is the late buckling stage inevitable in the bar life?

摘要： 通过自洽的数值模拟，我们研究了经典核球对棒状结构次级弯曲增长的动力学影响。 总体上我们考虑了14个具有不同盘和核球参数的模型。 我们发现，一个质量相当小的核球$B/D=0.1$会导致棒状结构几乎完全对称的演化，几乎不受初始恒星盘参数的影响，甚至可以抑制第一次弯曲。 同时，在我们所有没有核球的模型中，棒状结构都经历了短暂的一次性弯曲和持续的二次弯曲。 鉴于抑制二次弯曲的质量很小，我们得出结论，经典核球以及气体中心集中可能是本地宇宙中正在进行弯曲的棒状结构稀少的主要原因。 显示英文摘要

摘要： By means of self-consistent numerical simulations we investigated the dynamical impact of classical bulges on the growth of the secondary buckling of a bar. Overall we considered 14 models with different disc and bulge parameters. We obtained that a bulge with a quite modest mass $B/D=0.1$ leads to completely symmetrical evolution of the bar almost independently of the initial stellar disc parameters and even can damp the first bending. At the same time, the bars in all our bulgeless models suffer from the short primary and prolonged secondary buckling. Given the smallness of the mass suppressing secondary buckling, we conclude that a classical bulge along with the gas central concentration may be the main culprits for the rarity of bars with ongoing buckling in the local Universe.