The influence of structural defects on the dynamic characteristics of layered conical shell structures
DOI:
https://doi.org/10.32347/2410-2547.2025.115.213-223Keywords:
dynamics, three-layer conical shell, inhomogeneous aggregate, circular discontinuity, boundary conditions, finite element method, influence of structural defectsAbstract
The problem of dynamic deformation of a three-layer conical shell with rigidly clamped ends under the action of an internal distributed load was considered. The theoretical study of transient dynamic processes of three-layer conical shell structures with discrete-symmetrical rib-reinforced aggregate in the presence of annular discontinuities in the reinforcing ribs of such structures has been carried out. Finite element modeling has been performed and numerical calculations of normal strains and von Mises stresses of the load-bearing layers of the structure, determining its stress-strain state, have been carried out.According to the Hamilton-Ostrogradsky variational principle, the equation of motion of a three-layer conical shell with discrete-inhomogeneous aggregate has been obtained. The stress-strain state of three-layer structures under axisymmetric internal impulse loading has been investigated. The results of the magnitude of the first natural frequency of the considered structures are presented.The numerical results obtained by the finite element method made it possible to determine the significance of the influence of defects in the form of circular discontinuities on the characteristics of the stress-strain state of three-layer conical shells in the presence and absence of interlayer filler.Calculations of the values of normal strains and von Mises stresses of the inner layer of the three-layer conical structure with rigid clamping of its edges in the presence of a break in the fifth reinforcing rib showed a change in the middle surface between the fourth and fifth ribs. And in the presence of an interlayer filler, the values of these characteristics turned out to be practically the same.The calculated value of the first natural frequency of the considered three-layer structures in the presence of a defect in the form of a break in the fifth reinforcing rib almost does not change.
References
Zajcev B.F., Protasova T.V., Klimenko D.V. ta іn. Dinamicheskij analiz kompozitnogo obtekatelya rakety pri otdelenii s uchetom rassloeniya struktury (Dynamic Analysis of a Composite Missile Fairing During Separation Taking into Account Structural Delamination) // Aviacionno-kosmicheskaya tekhnika i tekhnologiya. – 2020. – № 8/168. – P. 19–26.
Rychkov S. P. Modelirovanie konstrukcij v srede Femap with NX Nastran (Modeling of structures in the Femap with NX Nastran environment)– M.: DMKPress, 2016. – 784 s.
Segerlind L. Primenenie metoda konechnyih elementov (Application of the finite element method). M.: Mir, 1979- 392 p.
Akimov D.V., Gryshchak V.Z., Gomenyuk S.I. and et. Finite-Element Analysis and Experimental Investigation on the Strength of a Three-Layer Honeycomb Sandwich Structure of the Spacecraft Adapter Module. Strength of Materials, 2016, vol.48, iss. 3, pp. 379–383.
Bakulin, V.N. Layer-by-Layer Study of the Stress and Strain State of Sandwich Conical Aircraft Compartments with Rectangular Cutouts. Russ. Aeronaut. 65, 668–676 (2022).
Lugovoi P. Z., GaidaichukV.V., Оrlenko S.P., Kotenko K.E. Dynamics of Sandwich Conical Shells with a Discretely Inhomogeneous Core Under Nonstationary Loading "International Applied Mechanics", 2022, 58(4), P. 410–422.
Timoshenko S.P., Woinowsky-Krieger S. Theory of Plates and Shells. Second Edition. New York etc.: McGraw-Hill Book Company INC, 1959. 636 p.
Wang Q., Li W., Zhao Z., Liu D., Gao S. Three-Dimension Crack Propagation Behavior of Conical-Cylindrical Shell, Structures, Volume 69.
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