midas NFX nafem benchmark

NAFEMS Benchmark: Torsional buckling of cantilever

Problem Description

Figure 1 shows a cantilever structure subjected to a point load P in the negative Z-direction at the neutral axis of the beam at the point E. A conservative load with no initial imperfection makes a linear buckling problem whereas a non-conservative load that follows the deformation with an initial imperfection produces instability. The cantilever structure is discretized using shell elements. The geometric imperfection is given in Table 1.

Figure 1. Cantilever model for torsional buckling

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