Analysis of the stress-strain state of a cylindrical multilayer shell of a protective structure under explosive loads
DOI:
https://doi.org/10.32347/2410-2547.2026.116.511-520Keywords:
multilayer structures, explosive loading, quasi-static formulation, Tsai-Wu strength criterion, blast wave profile, non-stationary vibrationsAbstract
The work involves modeling and analyzing of the stress state of shell bodies of a multilayer structure under quasi-static and dynamic loads. The quasi-static and non-stationary stress-strain state of heterogeneous building elements of structures made of significantly different structural materials is investigated.
Testing of the applied calculation methods is performed by comparing the results of solutions obtained for a two-dimensional and three-dimensional model of a multilayer cantilever beam.
The response of a cylindrical multilayer coating of a protective structure to an explosive load in a quasi-static and non-stationary setting is analyzed. In quasistatic statement displacement and complex stress state was explored and most loaded points were defined. A layer-by-layer strength assessment of a heterogeneous structure is performed using the Tsai-Wu strength criterion.
When modeling an explosive load in a non-stationary setting, the phases of positive and negative pressure are taken into account. An analysis of the oscillations that occur in the structure under such loads is performed. The damping of vibrations is modeled using Rayleigh damping. The dynamics of changes in displacements and stresses at selected points of the structure are described. There were defined frequency and decrement of free vibrations after load removal.
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