In the case of a post-critical failure, a substantial change in the geometry of a structure occurs. After reaching the instability of the equilibrium, a stable, strong position is reached again. The post‑critical analysis requires an experimental approach. It is necessary to manually load the structure in increments step by step.
This article shows the post‑critical analysis. A structural component can be imagined as a flat roof subjected to compression from the outside. When slowly increasing the compression, it is visible that the load is absorbed by the compression stress and transferred to a support.
When a certain compressive load is reached, the structural system becomes unstable and the post‑critical failure occurs.
When increasing the load again, it is primarily absorbed by tensile stress in the structural component.
Generally, the second‑order analysis cannot detect the post‑critical failure due to the linearization of the deformation geometry description.
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