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1
Content available Defects analysis of seat belt tensioner cast body
Soroczyński Artur, Czyżewski Piotr, Rechowicz Krzysztof
Welding Technology Review
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2020
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R. 92, nr 2
33--38
EN
The article presents an analysis of the implementation of a selected element of the traveler safety system used in road transport. The results of metallographic tests were presented, and the state of stress introduced to the casting by means of forming the element by means of plastic forming was analyzed. An analysis of the manufacturing process was carried out indicating the risks that may lead to cracks in the material structure. Possible causes of founding defects were pointed out and possible technological solutions were pointed out in order to avoid them.
PL
W artykule przedstawiono analizę wykonania wybranego elementu wyposażenia systemu bezpieczeństwa podróżnych, stosowanego w transporcie samochodowym. Przedstawiono wyniki badań metalograficznych oraz dokonano analizy stanu naprężeń wprowadzanych do odlewu poprzez kształtowanie elementu metodą obróbki plastycznej. Dokonano analizy procesu wytwarzania wskazując na zagrożenia, które mogą prowadzić do powstawania pęknięć w strukturze materiału. Wskazano na możliwe przyczyny powstawania wad odlewniczych oraz wskazano możliwe rozwiązania technologiczne w celu ich uniknięcia.
2
Content available Author's method of continuum states on the example of imperfection in the construction of a large-panel building
Bieranowski Piotr
Inżynieria Bezpieczeństwa Obiektów Antropogenicznych
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2020
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Nr 2
1--10
EN
The paper presents the results of FEM computer analysis regarding cracking of the wall prefabricated element. The proprietary coating model of the Wk-70 System large-panel building construction was used. For analysis, a construction diaphragm has been separated that is integrally connected to the vertical communication structure. Modeled through the scratch in the attic wall and compared with the wall model without damage. By building the shell model, a real and transparent picture of the static work of the structure was obtained, distinguishing zones: focus, redistribution, compensation and neutralization of stresses, whose genesis results from imperfection - scratches in a reinforced concrete composite. For the first time, the author introduces his own method of assessing the safety status of large-panel buildings - by the States Continuum Method.
3
Content available Influence of Bimoment Restraints on the Load-Bearing Capacity of a Steel I-Beam
Wierzbicki Krzysztof
Civil and Environmental Engineering Reports
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2020
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Vol. 30, no. 4
33--47
EN
The study presents an analysis of steel I-beam warping. The calculations were made for hot-rolled IPE200 hinged beams with different lengths. After determining load-bearing capacity using the GMNIA method, the beams were strengthened with bimoment restraints at each end. The changes in critical moment and load-bearing capacity were then evaluated. The study presents the manner in which the material and geometric imperfections have been determined. The GMNIA calculations were conducted using the Finite Element Method in Abaqus software. The results were then compared to results obtained with traditional methods and acquired from LT Beam software.
4
Content available Rysuję bo muszę myśleć
Hecker Zvi
Pretekst
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2019
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Nr 9
23--24
PL
Tekst dotyczy rozszyfrowywania znaczenia rodzącej się koncepcji.
EN
The text refers to decoding the meaning of a germinating concept.
5
Content available Flexoelectric and surface effects on a cracked piezoelectric nanobeam: Analytical resonant frequency response
Bastanfar M, Hosseini S.A.H., Sourki R., Khosravi F.
Archive of Mechanical Engineering
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2019
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Vol. LXVI, nr 4
417--437
EN
A nanoscale beam model containing defect under the piezoelectricity considering the surface effects and flexoelectricity is established on the framework of Euler-Bernoulli theory. The governing equations of motion and related boundary conditions are derived by using Hamilton’s principle. The imperfect nanobeam is modeled by dividing the beam into two separate parts that are connected by a rotational and a longitude spring at the defect location. Analytical results on the free vibration response of the imperfect piezoelectric nanobeam exhibit that the flexoelectricity and the surface effects are sensitive to the boundary conditions, defect position, and geometry of the nanobeam. Numerical results are provided to predict the mechanical behavior of a weakened piezoelectric nanobeam considering the flexoelectric and surface effects. It is also revealed that the voltage, defect severity, and piezoelectric material have a critical role on the resonance frequency. The work is envisaged to underline the influence of surface effects and flexoelectricity on the free vibration of a cracked piezoelectric nanobeam for diverse boundary conditions. It should be mentioned, despite our R. Sourkiprevious works, an important class of piezoelectric materials used nowadays and called piezoelectric ceramics is considered in the current study.
6
Content available remote Postbuckling of an Imperfect Plate Subjected to the Shear Load
Psotny M.
Mechanics and Mechanical Engineering
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2016
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Vol. 20, nr 2
177--184
EN
The stability analysis of an imperfect plate subjected to the shear load is presented, a specialized code based on FEM has been created. The nonlinear finite element method equations are derived from the variational principle of minimum of total potential energy. To obtain the nonlinear equilibrium paths, the Newton–Raphson iteration algorithm is used. Corresponding levels of the total potential energy are defined. The peculiarities of the effects of the initial imperfections are investigated. Special attention is paid to the influence of imperfections on the post–critical buckling mode. Obtained results are compared with those gained using ANSYS system.
7
Content available remote 3D Buckling Analysis of a Truss with Horizontal Braces
Iwicki P., Krajewski M.
Mechanics and Mechanical Engineering
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2013
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Vol. 17, nr 1
49–-58
EN
The present research is devoted to the study of out–of–plane buckling of a truss with horizontal braces. The truss is a model of real roof truss scaled by factor 1/4. A linear buckling and a non–linear analysis with geometric and material non–linearity were carried out. The truss buckling and limit load for different stiffnesses and number of braces are found. Numerical analysis are verified by experiment. Threshold bracing stiffness condition for full bracing of the truss is proposed.
8
Content available remote Imperfect spherical cap with stiffening ring subjected to external pressure
Stredova D., Tomek P., Pascenko P.
International Journal of Applied Mechanics and Engineering
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2010
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Vol. 15, no 2
483-490
EN
The aim of this paper is to perform a detail numerical analysis of both perfect and imperfect spherical caps subjected to an external pressure. The problem is limited to a case of the simply supported imperfect spherical cap stiffened with the circumferential ring at its edge. Both the central and lateral initial imperfection is considered. The main task is to find the reduction factor depending on the thickness parameter R/t. In addition to a theoretical description of this special stability problem, the results serve for a preparation of future experiments with real steel specimens. The finite element geometrically nonlinear computational analyses are performed by means of the computer program COSMOS/M.
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