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Methods for in-situ reinforcing of concrete building structures with external reinforcement based on carbon fiber to restore their service able technical state

Rimshin V., Kurbatov V., Kuzina E., Shubin L.

Budownictwo o Zoptymalizowanym Potencjale Energetycznym

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2018

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Vol. 7 Nr 2

7--14

EN

In this article, a method is proposed for calculating the reinforcement of concrete ceiling slabs with carbon composite materials based on the finite element model in the computer program SCAD Office PC. This method allows the most complete and accurate representation to be obtained of the structure stress-strain state before and after reinforcement with composite materials. Therefore, it allows high-quality designing and reduces the cost conducting calculations and tests on a large scale. The design values are taken from the initial data, and include conclusions based on the results of analysis of the technical state of the structures and drawings from the calculation section of the CS (reinforced concrete structures).

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Structure Analysis and Fatigue Life Prediction of the Large Scale Handling Device

Vaško M., Handrik M., Sága M., Kopas P., Vaško A.

Machine Dynamics Research

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2010

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Vol. 34, No. 4

102-109

EN

The goal of the paper was to present predictions of the fatigue lifetime of the large scale welded construction. The structural modelling and the stress-strain analysis were realised using finite element method. To determine the fatigue damage or the residual lifetime the "von Mises" equivalent stress was compared with normal stress from classical S-N (Wohler) curve (Fig. 5). The results were compared with reality, i.e. with measuring on real equipment. Distribution of the critical points confirmed consensus between both approaches (computational and experimental).

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Stress-strain analysis of the femoral component of ZIREMA total hip endoprosthesis

Žitňanský M., Rehák L'., Naď M., Ďuriš R.

Journal of Achievements in Materials and Manufacturing Engineering

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2010

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Vol. 43, nr 1

379--384

EN

Purpose: The results of the research project, which relates to the original design for total hip joint replacement, are presented in this paper. Solution of this project was recommended and supported by the Government Office of the Slovak Republic. Design/methodology/approach: Research methodology of total hip joint replacement has focused on a comprehensive analysis of this type of implants, which are implanted into patients around the world. Based on this knowledge and experiences of many years of leading Slovak orthopedists as well as experts in the field of material engineering such analysis was carried out in this study to and test a new type of femoral component. Findings: The result of the project was the design and implementation of original new type of hip replacement. Research limitations/implications: The new type of femoral component was experimentally tested in prestigious laboratories and is ready for clinical application in patients.Practical implications: After the completion the entire research and development it will be available for use in the SR situation. Originality/value: Product of research and development is an original Slovak cementless hip joint replacement coxal pull-up marked as ZIREMA.

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Numeryczna i eksperymentalna analiza wpływu geometrii matrycy na rozkład naprężeń i odkształceń podczas wyciskania materiałów złożonych

Nowotyńska I., Kut S.

Rudy i Metale Nieżelazne

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2009

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R. 54, nr 10

604-608

PL

W artykule zaprezentowano analizę rozkładu odkształceń oraz naprężeń w procesie wyciskania kompozytów warstwowych z zastosowaniem matryc o różnej geometrii. Przedstawiono rozwiązanie opierające się na metodzie elementów skończonych. Zaprezentowano przykładowe wyniki badań obejmujących rozkład odkształceń oraz naprężeń w kształtowanym materiale. Dokonano oceny efektywności zastosowania matryc o różnych kątach pochylenia powierzchni czołowej podczas wyciskania materiałów złożonych.

EN

In this paper the analysis of the stress and strain analysis during extrusion process of composite materials though different dies geometry has been presented. Solution based on the finite element method has been shown. Some results of the investigations including the strain and stress distribution have been presented. The efficiency of using of dies with different geometry during extrusion of composite materials have been evaluated.

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Strain-stress analysis of the surface replacement of the hip joint

Vosynek P, Navrat T

Modelling and Optimization of Physical Systems

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2009

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z. 8

113--118

EN

Today is the surface hip replacement very often surgery because of new studies and improvements. For young and active people iťs the best way to delay implantation of a conventional total hip replacement. The objective of this study was to perform finite-element analyses of computational model of the total surface replacement and physiological hip joint. We obtained strain-stress states from these analyses. All results were compared one another and then were confronted with results of the physiological hip joint. The three-dimensional computational model consists of these components: pelvic and femoral bone, muscles, artificial socket, and surface hip replacement. We were using FEM system ANSYS. The geometrical models of bones were generated by means of computed tomography (CT) images. The FE model of bone reflects two types of the bone tissues (trabecular and cortical bone) and muscles which are important when standing on one leg. The model of the muscle corresponds to isometric contraction. The implants material and bone tissues were modelled as isotropic linear elastic material. The model was loaded by force, corresponding to load by standing on one leg.

CS

Cílem této práce bylo určit deformačně-napěťové stavy v kyčelním kloubu s aplikovanou totální povrchovou náhradou pro různá ustavení femorální komponenty vůči stehenní kosti a srovnat je s deformačně-napěťovými stavy zjištěnými u fyziologického kloubu. Řešená soustava se skládá z křížové, pánevní, stehenní kosti, svalů, umělé jamky a femorální komponenty. Výpočty byly provedeny v konečnoprvkovém systému ANSYS. Geometrický model kostí byl vytvořen pomocí řezů získaných z počítačové tomografie. Zatížení odpovídá stoji na jedné dolní končetině. V práci je prezentována srovnávací analýza a výsledky deformačně-napěťových analýz, z nichž vyplývá celá řada velmi zajímavých poznatků.

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Stress-Strain Analysis of Ideally Plastic Material in Notches

Grudziński J., Buczyński A.

Machine Dynamics Problems

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2008

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Vol. 32, No. 3

20-33

EN

Reliability and fatigue life estimations of structural and mechanical components exercising multiaxial loads need predictions of evolution of stress and strain fields. The solution of the problem demands high accuracy regarding stress-strain distribution especially in zones affected by stress concentrators such as cracks, geometrical or structural notches etc. The paper is addressed to numerical analysis of material plastic flow near the root of the U-type notch, located in a plate made of ST37 steel, under non-symmetric cyclic loads. The FEM will be applied to solve the problem, formulated in 2D space. The material behavior will be predicted by using the ideal plasticity cyclic model.

7

Stress-strain analysis of temperature loading collector system

Jendželovský N., Sumec J.

Roczniki Inżynierii Budowlanej

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2006

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z. 6

37--40

EN

This contribution analyzing the stress-strain behavior of beam structure temperature loaded which are placed on the elastic subsoil and modeled by two-parametrical model subgrade. Mathematical model is represented by linear differential equations of thin-walled beam problem of bending and torsion under the temperature effects. From the practical point of view, we shall deal with mechanical response of two-way chamber underground collector system.

SK

V článku je analyzovaná napätosť dvojkomorového železobetónového kolektora ležiaceho na pružnom podloží. Vnútro kolektora je zaťažené dvoma rozdielnymi vnútornými teplotami. Uvažovaný je dvojparametrický model podložia s dvoma variantmi konštánt C1, C2. Analyzovaný je vplyv podložia na priebeh vnútorných síl a zovšeobecnených premiestnení.