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3 Mechanics and Mechanical Engineering

3 2013

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Numerical Representation of Bifurcation in the Process of Determining Stress Distributions in Post-Critical Deformation States of Aviation Load-Bearing Structures

Chodorowska D., Kopecki T., Mazurek P.

Mechanics and Mechanical Engineering

2013

Vol. 17, nr 1

17--27

The study presents the results of research on the problem of obtaining credible results of nonlinear FEM analyses of thin-walled load-bearing structures subjected to post-critical loads. The similarity of numerical simulations results and actual stress distributions state depends on the correct numerical reproduction of bifurcations that occur during advanced deformations process.

Numerical Analysis of Stability of Thin-Walled Composite Column with Open Cross-Section

Dębski H.

Mechanics and Mechanical Engineering

2013

Vol. 17, nr 1

29–-35

In the paper a numerical analysis of both critical and post–critical state of a thin–walled channel–section simply supported beam under axial compression. The beam was made of carbon–epoxy symmetrical composite prepared with a pre–preg technology using 8 layers of unidirectional band. The numerical simulations were performed with Finite Elements Method (FEM) in Abaqus and Ansys environment and an analytical–numerical method based on the Koiter theory of conservative systems stability. The value of critical load was estimated according to the Tsai–Wu stress criterion. The performed calculations enabled critical state identification, as well as deformation states and effort analysis of the laminate structure in post–critical state.

Dynamic Response of Viscoplastic Thin-Walled Griders in Torsion

Czechowski L.

Mechanics and Mechanical Engineering

2013

Vol. 17, nr 1

7--16

This work deals with an analysis of isotropic or orthotropic girders subjected to transient dynamic loads. The duration of dynamic loading was assumed to be equal to a period of the natural fundamental flexural vibrations of a structure under analysis. Numerical calculations were performed with the finite element method using ANSYS ® 11.0 software. The results of computations were presented as maximum angle of the rotation of the girder in a function of the dynamic load factor, DLF (the ratio of pulse loading amplitude to static critical load). In study it has been taken into account apart from the elastic–plastic range of material with isotropic hardening as well as the strain rate effect described by Perzyna model.