Properties of numerical solution of the deformation and buckling problem in shallow conical shells under external pressure

Authors

  • A. G. Karasev State Higher Education Establishment «Pridneprovsk State Academy of Civil Engineering and Architec-ture», 24-A, Chernishevskogo st., Dnipropetrovsk, Ukraine, 49600, Ukraine

Keywords:

shallow conical shell, external pressure, deformation, buckling, numerical solutions, dangerous buckling model, software

Abstract

Aim. In the last decade, a large series of tests of buckling under external pressure of small specimens of shallow closed circular conical shells in a wide range of variation of their geometry was carried out in Ukraine. A comparison of the experimental data with the results of the calculations was done. These studies have shown that there remain a number of issues insufficiently studied. The aim of the work is to analyze the results of numerical solution of two problems of deformation and buckling of closed shallow conical shells under external pressure: 1) linear (bifurcation) solution to determine the critical pressure (qcr) (Problem 1); 2) geometrically nonlinear solution of the problem of deformation and buckling of shells with the definition of the limit pressure (qlim) using axisymmetric shell FE (Problem 2). Methodology. The problems are solved numerically in the ANSYS software. To solve the Problem 1 is used quadrangular finite element (FE) SHELL 181, and to solve the Problem 2 an axisymmetric FE 208 SHELL. Results. The numerical solution of two problems of deformation and buckling under external pressure of elastic closed shallow conical shells was done in ANSYS. Research carried out for the cases of fixed encastre and hinged support of base of the cone in a wide range of shells geometry (100 ≤ R/h ≤ 2000 and 0°.5 ≤α≤ 20°). Scientific novelty. The features of geometrically nonlinear solution of the Problem 2 was defined. These features realising its shell axially symmetric deformation at all stages: before and after the limit point (except the area of the top of the cone). Practical significance. The results of numerical studies allow clarify-ing the calculation of the studied shells. Further, it will allow carrying out a comparative analysis of linear and nonlinear problems of buckling in solutions aimed at identifying of dangerous shells buckling model.

Author Biography

A. G. Karasev, State Higher Education Establishment «Pridneprovsk State Academy of Civil Engineering and Architec-ture», 24-A, Chernishevskogo st., Dnipropetrovsk, Ukraine, 49600

Ph.D. in Technical Sciences, associate professor., Department of Life Safety

References

Alumyae N.A. Ob opredelenii sostoyaniy ravnovesiya krugovoy konicheskoy obolochki pri osesimmetrichnyih nagruzkah [To determination of stability state of circular conical shell under axisymmetric loads]. Prikladnaya matematika i mehanika [Applied mathematics and mechanics]. – 1953. – V. 17, № 5. – pp. 23-26. (in Russian)

Volmir A.S. Gibkie plastinyi i obolochki [Flexible plates and shells]. – M.: Gostehizdat, 1956. – 419 p. (in Russian)

Grigolyuk E.I., Kabanov V.V. Ustoychivost obolochek [Stability of shells]. – M.: Nauka, 1978. – 359 p. (in Russian)

Krasovskiy V., Prokopalo E., Varyanichko M. Eksperimentalnoe i teoreticheskoe issledovanie ustoychivosti zamknutyih pologih konicheskih obolochek pri vneshnem davlenii [Experimental and theoretical study of stability of closed shallow conical shells under external pressure]. Theoretychni osnovy budivnytztva [Theoretical Foundations of Civil Engineering]. – Polish-Ukraїnian Transactions – Dnepropetrovsk – 2005. №13. –pp. 175-188. (in Russian)

Shkutin L.I. Opredelenie kriticheskoy velichinyi davleniya dlya pologih konicheskih obolochek [Determination of the critical value of the pressure for shallow conical shells]. Trudyi VI Vsesoyuznoy konferentsii po teorii obolochek i plastin [Proceedings of the VI All-Union Conference on the Theory of Shells and Plates]. – M.: Nauka, 1966. – pp. 849-852. (in Russian)

Shubin I.A., Shkutin L.I. Eksperimentalnoe issledovanie ustoychivosti pologih konicheskih obolochek pri staticheskom nagru-zhenii davleniem [Experimental study of the stability of shallow conical shells under static pressure loading]. Prikladnaya mehanika [Applied mechanics]. – 1966. – V.2, № 6. – P. 63-70. (in Russian)

ANSYS Inc. Academic Research, Release 13.0, Help System, Mechanical Analysis Guide.

Karasev А.G. Initial imperfection influence on the buckling load of closed elastic isotropic shallow conical shells. Mathemat-ics and Mechanics of Solids – April 2016 vol. 21 no. 4 pp.444-453, doi: 10.1177/1081286514526082.

Published

2016-10-20

Issue

Section

Life Safety