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在《关于管的挤压理论(一)》一文中,我们曾谈到,薄壁管以及中等壁厚管受水力外压挤毁是属于结构失稳破坏;而且按照管径与壁厚比值之不同,这类破坏又分为二种性质:弹性不稳定破坏和弹—塑性不稳定破坏。并且谈到,虽然管的外压稳定理论已有近百年研究历史,但除了理想园管的弹性理论公式外,其他各种已有理论计算公式都未能完满的解决各自公式命题所要解答的问题。
In the article “Squeezing theory of pipe (I)”, we have mentioned that the thin-walled pipe and medium-wall pipe are squeezed out by hydraulic external pressure and belong to structural instability damage; and according to the ratio of pipe diameter to wall thickness Differently, these kinds of damage are divided into two kinds: unstable instability and elastic-plastic instability. Besides, although the theory of tube external pressure stabilization has been studied for nearly one hundred years, all the other existing theoretical calculation formulas have not been able to satisfactorily solve the problems to be solved by their respective formula propositions, except for the flexible theory formula of the ideal circular tube .