Abstract
It is well known that the buckling of a structure includes two kinds of different physical phenomena. One is called snap-through buckling and the other is called bifurcation. In this paper, the criteria to identify the two different unstable types are developed. The analysis in the present paper shows that the type of critical points can be directly determined by the incremental equilibrium equations in the general finite element analysis and that it only depends on whether or not the load increment does work through the unstable mode associated with the critical load.
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