Institute for Logistics and Production Systems

Miskolc, Hungary

Institute for Logistics and Production Systems

Miskolc, Hungary
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Paczelt I.,University of Miskolc | Beleznai R.,Institute for Logistics and Production Systems
Computers and Structures | Year: 2011

The p-extension concept in the finite element method has been developed for simple straight two-layered wire rope strand which considers all possible inter-wire motions, contact and dry friction between the wires in case of small displacement and deformation. The special nonlinear contact theory has been developed for considering contact. While formulating contact kinematic conditions, the Poisson effect and wear between the elements are also considered. The structure can be subjected to tension, torsion and bending loading. The linear elastic material properties are assumed for the calculations. Several case studies are presented in the paper to verify the applicability and accuracy of the FE code. © 2010 Elsevier Ltd. All rights reserved.


Beleznai R.,Institute for Logistics and Production Systems | Lenkey G.B.,Institute for Logistics and Production Systems | Lauerova D.,Nuclear Research Institute Řež
Journal of Nuclear Materials | Year: 2010

Weibull stress model represents a basic local approach model used in the ductile-to-brittle transition region for description and prediction of cleavage fracture for materials of both PWR and WWER reactor pressure vessels. In the Weibull stress model used most frequently until now [1], the parameters are determined by a calibration procedure using the fracture toughness values of high and low constraint specimens. In the present paper, the results of SEN(B) pre-cracked specimens of 10 × 20 × 120 mm size, with deep and shallow cracks, are utilized. Specimens were made of material of WWER-1000 reactor pressure vessel, and were tested at Nuclear Research Institute Rez. Determination of Weibull stress was performed for both the case of including plastic strain correction into the Weibull stress formula and without it. © 2010 Elsevier B.V. All rights reserved.


Beleznai R.,Institute for Logistics and Production Systems | Szavai S.,Institute for Logistics and Production Systems
Strength of Materials | Year: 2010

We have performed finite element calculation of precracked Charpy-like three-point bending specimen, in order to analyze the effect of warm prestressing on fracture toughness value of reactor pressure vessel steels. Two different hardening laws were applied in the calculation. J-integral was determined in both cases and comparative analysis was made. © 2010 Springer Science+Business Media, Inc.


Beleznai R.,Institute for Logistics and Production Systems | Paczelt I.,University of Miskolc
Proceedings of the 8th International Symposium on Tools and Methods of Competitive Engineering, TMCE 2010 | Year: 2010

Parametric analysis of strands can be performed with tractable computer codes because analytical description is not enough accurate for wear calculation, but such software is not available yet. The developed model should provide appropriate response about the analyzed phenomena for the designer. The presented p-version finite element code, which was developed for simple straight, two-layered wire rope strand structure, is applicable for this, because it describes the geometry well, and takes into account all possible inter-wire motions, contact and friction effects between the wires. A special nonlinear contact theory was developed for the contact consideration based on the Hertz-theory. Increasing the polynomial order of the displacement based p-version finite elements provides the possibility for error estimation and increasing the accuracy of the results. The structure can be subjected to tension, torsion and bending load. Linear elastic material properties were used for the calculation. The developed code is an applicable tool for design of wire rope strands, requires low computer resources and short computational time, and means the base for wear analyses, which is the further task in the presented research work. The presented case study demonstrates the efficiency and applicability of the method. © Organizing Committee of TMCE 2010 Symposium.

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