Nonlinear Deformation of Cylinders from Materials with Different Behavior in Tension and Compression

Authors

Oleksandr Z. Galishin, S. P. Timoshenko Institute of Mechanics of NAS of Ukraine (3, Nesterova str., Kyiv, 03057, Ukraine), e-mail: plast@inmech.kiev.ua, ORCID: 0000-0003-0286-872X

Serhii M. Sklepus, S. P. Timoshenko Institute of Mechanics of NAS of Ukraine (3, Nesterova str., Kyiv, 03057, Ukraine), Anatolii Pidhornyi Institute of Mechanical Engineering Problems of NAS of Ukraine (2/10, Pozharskyi str., Kharkiv, 61046, Ukraine), e-mail: snsklepus@ukr.net, ORCID: 0000-0002-4119-4310

Abstract

A new numerical-analytical method for solving physically nonlinear deformation problems of axisymmetrically loaded cylinders made of materials with different behavior in tension and compression has been developed. To linearize the problem, the uninterrupted parameter continuation method was used. For the variational formulation of the linearized problem, a functional in the Lagrange form, defined on the kinematically possible displacement rates, is constructed. To find the main unknowns of the problem of physically nonlinear cylinder deformation, the Cauchy problem for the system of ordinary differential equations is formulated. The Cauchy problem was solved by the Runge-Kutta-Merson method with automatic step selection. The initial conditions were established by solving the problem of linear elastic deformation. The right-hand sides of the differential equations at fixed values of the load parameter corresponding to the Runge-Kutta-Merson’s scheme are found from the solution of the variational problem for the functional in the Lagrange form. Variational problems are solved using the Ritz method. The test problem for the nonlinear elastic deformation of a thin cylindrical shell is solved. Coincidence of the spatial solution with the shell solution was obtained. Physically nonlinear deformation of a thick-walled cylinder was studied. It is shown that failure to take into account the different behavior of the material under tension and compression leads to significant errors in the calculations of stress-strain state parameters.

Keywords: thick-walled cylinder, different behavior in tension and compression, physically nonlinear deformation, uninterrupted parameter continuation method.

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Received 05 October 2023

Published 30 March 2024