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Badanie właściwości mechanicznych stali S355JR o różnych typach budowy mikrostruktury

Lipiec Sebastian

Stal, Metale & Nowe Technologie

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2023

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nr 1-2

36--40

PL

W artykule analizowana jest stal S355JR o różnych typach budowy mikrostruktury: poddana normalizacji, ze strukturą ferrytyczno-perlityczną (FP), oraz po wygrzewaniu austenityzującym, następnie chłodzona z dużą prędkością poprzez hartowanie w oleju, ze strukturą ferrytyczno-bainityczną (FB).

XX

An important aspect in the engineering design process is to know the true material characteristics of steels used in specific microstructures. These steels, depending on, among other things, heat treatment or working conditions and regimes, are characterised by a different microstructure. It is important to know the levels of both strength, ductility and fracture toughness of steels with different microstructure. This paper presents the results of an experimental study of S355JR steel with two types of microstructure: ferritic-perlitic and ferritic-bainitic. The basic strength and ductility characteristics of the steel determined by uniaxial tensile test and the results of fracture toughness tests are presented.

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Numerical and experimental true strain assessment on sheet forming using mapped versus free meshing

Lajarin S. F., Magalhães J. S. F., Marcondes P. V. P.

Journal of Achievements in Materials and Manufacturing Engineering

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2011

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Vol. 49, nr 2

323--330

EN

Purpose: The main aim of the present study was to analyze the influence of the algorithmic theories of generation and control of triangular, quadrilateral, hexahedral and tetrahedral meshing, i.e. which are the most common types of meshes used in the software of finite elements for large plastic deformation. The importance of these methods is due to the fact that they are the spine of Finite Element Methods (FEM). Design/methodology/approach: It was numerically evaluated the parameters influencing mapped (structured) and free meshing on sheet forming simulation (stretching). For the tests a stretching tool with geometry proposed by Nakazima was used. The study presents the results in terms of the major true strains (ε1, ε2, ε3) and a comparison with experimental data was carried out (validation). Findings: The analysis showed that Shell-type elements are dependent of the element format choice and the way of application in the geometry. Objects built with Shell type elements, i.e. components that will suffer large plastic deformation are extremely sensitive to the mesh format, refinement and way that it was applied. A relationship was also shown among equivalent meshes for elements in the format Tri and Quad. Research limitations/implications: To describe the complete influence of the type of meshing are beyond the scope of this study as it was used only one commercial software and one method of forming. Practical implications: The correct choice of the meshing parameters can provide more accurate results during the simulations of sheet stretching process. Originality/value: The paper shows the differences and implications of the correct choice of meshing during finite element analysis.

3

Naprężenia ściskające przy 10 % odkształceniu względnym próbek normowych pobranych z płyt EPS o różnej grubości

Owczarek Z.

Warstwy, Dachy i Ściany

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2008

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nr 3

93-96