Design Calculation Technique for Thick-Walled Composite Constructions Operating Under High-Speed Loading

Abstract

The scientific paper presents a technique for calculating a thick-walled axially symmetrical construction consisting of a steel rod (reinforcing component) and an external thick-walled shell made of carbon fiber. The construction is loaded with linear load distributed along its length, associated with the operating external pressure, and inertial forces. The technique is based on a one-dimensional model of a composite rod of variable cross-section, roughly taking into account transverse deformations, which is necessary when analyzing a thickwalled construction operating under pressure. In the proposed approach, the geometry of the product is divided into sections and approximated by fragments in the form of truncated cones and, in the particular case, in the form of cylinders. As a result of calculations, the distribution of normal tensile/compression stresses in the shell and in the reinforcing rod, as well as tangential stresses at the boundary of their contact, are determined. As a result of test calculations, a fairly good consistency of the considered one-dimensional model with refined finiteelement modeling is shown. It has been established that the concentration of shear stresses is realised due to the presence of substantially inhomogeneous deformations in the areas of sharp changes in geometry, a reduction in the radius of the shell (the appearance of edge effects), and in the area of a sharp increase in the radius of the bevel of the shell where external pressure is in place.

Numerical Analysis of Deformation Characteristics of Elastic Inhomogeneous Rotational Shells at Arbitrary Displacements and Rotation Angles

“…Since for approximation of VAT parameters in initial and deformed states the same type finite-difference approximations ( 14)-( 19) are used, then at (q 1 ) i = (q 2 ) i = 0 the nondeformed state given by relations ( 14), ( 15) is the exact solution of grid equations (20), that confirms the correctness of developed difference approximations ( 14)-( 21). To construct a computational algorithm for solving the system of nonlinear grid equations (20), a quasi-dynamic form of the establishment method is used [3][4][5]9]. To construct the evolutionary problem, the grid analogs of equilibrium equations (20) are replaced by nonstationary equations that have the same form as the shell's equations of motion in a viscous medium [1][2][3]5].…”

“…The works related to the study of inhomogeneous elastic shells are reviewed in publications . Estimating formulas, taking into account the structure of equations (23), can be written in the form (27) [5,8,9]:…”

“…21 within the m-layer [9][10][11]. The equilibrium equations of the deformed element of a rotational shell have the following form (11) [4,5,8]:…”

CAM model parameterisation methodology and its further unification in Siemens NX environment

“…The meaning of this technical solution is based on the fact that it is possible to impose geometric and dimensional constraints on the body, leading to a transformation of the shape itself. This feature will not require changes to operations previously worked out in the construction tree [7].…”

Numerical Simulation of the Stress-Strain State of a Hybrid Titanium-Polymer Composite Material for Optimizing the Design of Aircraft Structures

“…-the analysis of the structure of samples from TPCM, the production of which was tested in previous works [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15], was carried out;…”