The two kinds of nonlinear buckling (primary buckling and secondary bifurcation buckling) of elastic arches are elaborated in detail.
本文详细阐述了拱的非线性屈曲的两种形式，即极值点屈曲和二次分叉屈曲；
A primary formula to calculate the buckling critical load is put forward, when U-shaped bellows only subjected to bending, and will be discussed for the future.
此外，本文提出了在弯矩载荷作用下，U形波纹管膨胀节失稳临界弯矩的初步计算公式。
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