Quasi-static stability of a ribbed shell interacting with moving load

Abstract

Loss of stability of thin-walled structural elements of aircraft is the most common type of destruction. In this work, the definition of the critical velocity of a pressure wave moving over the surface of an acclivous, ribbed cylindrical shell, which is the most common design element of all aviation and rocket systems, is considered. The article takes into account the discreteness of the location of stiffeners (stringers), in contrast to other works, where ribbing is taken into account only within the framework of a constructive orthotropic model. In the quasi-static formulation, the problem of the stability of a shallow shell with a discrete arrangement of stringers under the action of a moving radial load has been solved. The range of critical speeds of movement of the load is defined. An example is considered.

Effect of High Velocity Deformation on Strength of ArmoredComposite Materials

“…The volumetric content of fibers was 60%, the diameter of the fibers was 5 μm. Samples of three types were considered: 1) a quasi-homogeneous layered composite with a unidirectional reinforcement scheme, 2) a unidirectional composite with a wavelike layered structure, and 3) a pure matrix [26][27][28][29][30][31][32][33][34][35][36][37].…”

Creation of Polymer Coatings for Improving of Protective Properties of Surfaces

“…From the point of view of strength calculations, thin-walled metal structural elements with polymer coatings can be presented in the form of two-or three-layer plates (depending on whether the coating is applied on one or both sides) with a tougher metal middle layer and much more pliable outer layers-coatings [25][26][27]. Currently, not many experimental and theoretical works are known in which the analysis of the macroscopic mechanical behavior of such structural elements is carried out taking into account the effects of the influence of residual stresses [28][29][30]. It is possible to note a wide variety of works in the field of research of functional-gradient thinwalled structures with coatings (see, for example, [26][27][28] and references therein).…”

Effect of Shape of Armoring Fibers on Strength of Composite Materials

“…Currently, a large number of studies have been carried out to obtain and study the strength of composite materials [1][2][3][4][5][6][7][8][9]. A large amount of experimental data dedicated to the synthesis and exploration of heterophase composites were obtained [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26].…”