This paper makes an analysis on the relation of the stress boundary with the critical tangential compressive stress as well as on its influence on critical internal wrinkling.

本文分析推导了应力分界圆与临界起皱压应力、危险断面径向拉应力之间的关系，以及对临界起皱的影响。

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An axially compressive thin-walled steel element on elastic foundation is adopted to deduce the critical stress and critical diameter to thickness ratio for circular steel tube in local buckling.

在此基础上，把薄壁钢管纵向单元作为支承在弹性地基上的压杆，推导出钢管出现局部屈曲的临界应力和临界径厚比。

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When compressive stress reaches zero, a critical value of the post-peak Poisson's ratio is achieved.

当压缩应力降至零时，峰后泊松比达到临界值。

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