A Dynamic Stability Criterion Suitable for Cylindrical Shells under Impulsive Loads
DOI:
https://doi.org/10.70567/mc.v41i2.5Keywords:
buckling, thin-walled cylindrical shells, dynamic buckling, explosionsAbstract
In the petrochemical industry, cylindrical hydrocarbon storage tanks may be subject to the effects of external explosive waves from detonations. The dynamic buckling limit state of thin shells under short-duration asymmetric loading has not been fully explored in the literature mainly due to the lack of appropriate criteria. In this work, a criterion is developed and proposed to estimate critical actions by measuring the restoring forces of the system in an integral (weak) sense. The instability results on the movement trajectory (quasi-bifurcation) published since 1977 by L.H.N Lee, serve as a basis for the analyses carried out. We work on an elastoplastic ring model that allows us to study in a simplified way the critical impulsive modes of cylindrical tanks as shown by the authors in previous publications. From this model, critical dynamic buckling loads of typical tanks in the oil industry are measured and the results are compared with numerical models by the finite element method. From the results it can be concluded that through the proposed criterion it is possible to obtain a good approximation to the dynamic buckling limit state.
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