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.

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Figure 1. Cantilever model for torsional buckling

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