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1
Content available remote Postbuckling behaviour of graphene-reinforced plate with interfacial effect
100%
Kumar Srivastava A. , Kumar D.
Archives of Mechanics
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2018
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tom Vol. 70, nr 1
3--36
EN
The present study is aimed to study the postbuckling response of the graphene sheet (GS)-reinforced plate including the effect of van-der-Waals (vdW) bonding between GS and matrix. An equivalent solid fibre (ESF) containing GS and the interfacial region is modelled, and that are randomly dispersed into the matrix with the aid of the Boolean based random sequential adsorption (RSA) technique. The elastic constants of the nanocomposite are calculated by the FEM-based homogenization procedure. It is established that interphase zone, stacking and short GSs pose the negative effect on the elastic properties of nanocomposite and postbuckling strength of the GS-reinforced plate.
2
Content available Experimental and numerical analysis of the compression thin-walled composite plate
100%
Falkowicz K. , Mazurek P. , Różyło P. , Wysmulski P. , Smagowski W.
Advances in Science and Technology. Research Journal
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2016
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tom Vol. 10, nr 31
177--184
EN
The subject of research is a rectangular plate with a cut-out subjected to regular compression. The plate articulately supported on the short side edges, made of a composite with high strength properties. The study concerned the numerical finite element analysis linear and nonlinear stability of the structure and the experimental validation of the results. The instrument used was a numerical program ABAQUS®.
3
Content available Analysis of Thin-Walled Elements, with Ribbed Stiffeners, in the State of Post-Critical Deformations
100%
Mazurek P.
Advances in Science and Technology. Research Journal
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2023
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tom Vol. 17, no 4
61--69
EN
The paper presents the results of research on fragments of thin-walled coverings made of aluminum alloy. The exmined structures were subjected to shear stresses leading to post-critical deformations. Three types of elements were analyzed: an element without stiffeners (the referencial one), an element with three stiffening ribs and an element with five stiffening ribs. The results of numerical analyzes and static experimental research were presented. Althought this kind of solutions is commonly used in various aircraft structures, the publications about it are usually hard to rich. The research concerning ribbed stiffeners are usually performed inside laboratories of aerospace concerns and their results are not published in the open sources. The general direction of analyses of this solution is indicated in presented study.
4
Content available Postbuckling behaviour of laminated plates with a cut-out
100%
Falkowicz K. , Dębski H.
Advances in Science and Technology. Research Journal
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2017
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tom Vol. 11, no 1
186--193
EN
The subject of research is the numerical and experimental analysis of a thin-walled plate with the cut-out, made of the laminate and subjected to the axial compression. In order to ensure the stable plate work in the postcritical range, it need to force its work by higher flexural-torsional form of buckling. The scope of the research included nonlinear numerical analysis with Finite Element Method (FEM) and experimental verification of calculation results. For the composite material in numerical calculations, the model of orthotropic material in the flat state of tension was defined. For the mapping of the plate element coating finite elements of type SHELL was applied with a shape function of the second order to allow the mapping of the composite structure for the element thickness. The experimental research was carried out in a special grips providing the articulated support of the upper and lower edges of the plate. The deformation registration of compression structures were carried out with resistance extensometry. This allowed to define of postcritical equilibrium paths of real structure, showing the dependence of the force to displacement. The instrument used was a numerical program ABAQUS®.
5
Content available Fatigue Strength of Thin-Walled Rectangular Elements in the State of Post-Critical Deformation
75%
Mazurek P.
Advances in Science and Technology. Research Journal
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2019
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tom Vol. 13, no 2
84--91
EN
The paper presents the results of numerical analyses and static experimental testing of thin-walled rectangular elements subject to post-critical deformation under shear conditions. The deliberations concerned the elements made of aluminium alloy and the model material. The obtained stress distribution was used to conduct a numerical simulation of the fatigue strength for a metal plate and testing under cyclic load conditions for both types of models.
6
Content available remote Free And Forced Vibrations of a Post-Buckled Delaminated Beam-Plate Resting on a Two Parameter Elastic Foundation
75%
Bichir S. , Esmaeel R. A. , Nassar M. M.
Mechanics and Mechanical Engineering
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2005
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tom Vol. 9, nr 2
207--222
EN
In this study, the free and forced vibrations of a delaminated beam-plate resting on a two-parameter (Pasternak type) elastic foundation are investigated. We consider a homogeneous isotropic clamped beam-plate compressed axially and subject to an external time dependent force. In order to study the vibration of the delaminated beam-plate relative to a post-buckled state we should solve the static deformations. This has been accomplished by the successive substitution method.The free and forced vibration analysis are then performed. Results are represented in both graphical and tabulated forms and shows that the natural frequencies are affected by the change in the delamination length, depth and location and also affected by the change in the elastic foundation parameters.
7
Content available remote Numerical and Experimental Analysis of Compression Plate with Cut-Out
71%
Falkowicz K. , Dębski H.
Mechanics and Mechanical Engineering
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2016
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tom Vol. 20, nr 2
167--175
EN
A buckling and post{buckling behavior analysis of thin-walled composite plate under a compressive force is presented. The plate with central notch was made of a carbonepoxy composite - a laminate consisting of eight symmetrically oriented plies. The one layer arrangement was taken into consideration. The main objective of the study was to investigate the behavior of the considered plate under quasi-static compression. A numerical analysis was conducted with the Abaqus commercial FEM software package. The experimental test was performed under standard conditions on a universal Zwick/Roell Z050 testing machine. The results obtained in the numerical methods are compared to these obtained experimentally. The experimental results were then used to develop new FEM models that allowed one to describe the post{buckling behavior and to estimate the ultimate load-carrying capacity of the composite plates under investigation.
8
Content available remote Postbuckling of an Imperfect Plate Loaded in Compression
63%
Havran J. , Psotny M.
Mechanics and Mechanical Engineering
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2016
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tom Vol. 20, nr 2
143--149
EN
The stability analysis of a plate loaded in compression is presented. The non–linear FEM equations are derived from the minimum total potential energy principle. The peculiarities of the effects of the initial imperfections are investigated using the user computer code. Special attention is paid to the influence of imperfections on the post– critical buckling mode. The FEM computer program using a 48 DOF element has been used for analysis. FEM model consists of 4x4 finite elements. Full Newton-Raphson procedure has been applied.
9
Content available Cylindrical shells made of stainless steel – investigation of postbuckling
63%
Stehr S. , Stranghoner N.
Civil and Environmental Engineering Reports
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2017
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tom No. 25(2)
185--197
EN
The relevant load case of open thin-walled shells is often wind loading during construction. Because of the missing stabilization effect of the roof they show a very high sensitivity to buckling which results into higher wall thicknesses. As part of the European RFCS research project BiogaSS the Institute for Metal and Lightweight Structures of the University of Duisburg-Essen carried out investigations on open thin-walled tanks made of austenitic and duplex stainless steels under wind load to study a possible economic advantage which might be gained from the consideration of the elastic postbuckling behaviour. This contribution presents not only experimental and numerical results but also first recommendations regarding the range of possible buckling reduction factors which might be incorporated in future revisions of EN 1993-1-6 and EN 1993-4-2.
PL
Najbardziej adekwatnym przypadkiem obciążenia otwartych, cylindrycznych powłok cienkościennych jest obciążenie wiatrem podczas wznoszenia powłoki. Wobec braku stabilizującego efektu dachu, powłoki wykazują bardzo dużą wrażliwość na wyboczenie, która prowadzi do konieczności zwiększenia grubości ścian powłoki. Instytut Konstrukcji Lekkich i Metalowych Uniwersytetu Duisburg-Essen przeprowadził badania stateczności otwartych zbiorników cienkościennych wykonanych z nierdzewnych blach ze stali austenicznej i ze stali duplex poddanych działaniu obciążenia wiatrem. Celem tych badań było określenie możliwych korzyści ekonomicznych wynikających z uwzględnienia sprężystych stanów pokrytycznych. Badania te były częścią Europejskiego Projektu RFCS BiogaSS. Prezentowana praca przedstawia nie tylko wyniki badań eksperymentalnych i analiz numerycznych, lecz także pierwsze propozycje zaleceń dotyczących zakresu redukcyjnych współczynników wyboczeniowych, które w przyszłości mogą być włączone do norm EN 1993-1-6 i EN 1993-4-2.
10
Content available remote Postbuckling of an Imperfect Plate Subjected to the Shear Load
63%
Psotny M.
Mechanics and Mechanical Engineering
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2016
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tom 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.
11
Content available Experimental and numerical analysis of compression thin-walled composite plates weakened by cut-outs
54%
Falkowicz K. , Falkowicz K.
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nr 4
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