When this separation strains the cable material beyond its elastic limit, instability or birdcaging occurs in the form of the permanent deformation.

当内外股分离给缆线材料所造成的压力操作了弹性极限后， 易位或者不稳定的情况就会产生，进而造成永久的变形。

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The concept of the structural performance safety index is put forward and its calculation method is derived based on the structural deformation limit state equation.

提出了结构性能安全指数的概念，并以结构的变形极限状态方程为基础得到了结构设计性能安全指数的计算方法和结构性能等级的划分标准。

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According to the limit deformation, a method for calculation of the critical curvature of the tube is developed.

根据材料的极限变形，导出管轴临界弯曲半径的计算方法。

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