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。
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。
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。
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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