Temat: surfaces - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: General directions in contact modelling development
Autorzy:: Maciolka, Pawel
Jedrzejewski, Jerzy
Powiązania:: https://bibliotekanauki.pl/articles/99664.pdf
Data publikacji:: 2019
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: flat surfaces
contact
asperity
FE model
Opis:: This paper presents a survey of works, selected from the period of the last twenty years, on deformations in the contact between rough surfaces. All the selected works use FEM. They deal with the modelling of individual contact asperities or the use of experiment to verify contact models. First, research directions connected with the modelling of single asperities, whose shape is usually approximated with that of a hemisphere or a half cylinder, are presented. Section 3 discusses research directions concerning models which include the layer under asperities, and models for small contact surfaces (about 1 mm²). Section 4 reviews directions in contact modelling which takes into account neighbouring asperities and laterally loaded asperities. Section 5 discusses directions in the development of models and experiments used or suitable for verifying models. Finally, conclusions concerning accurate contact deformation modelling are presented.
Źródło:: Journal of Machine Engineering; 2019, 19, 4; 91-109
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 2.

Tytuł:: Research of electrolyte low loss in typical ECM gaps
Autorzy:: Paczkowski, T.
Zdrojewski, J.
Bujnowski, S.
Janicki, D.
Powiązania:: https://bibliotekanauki.pl/articles/99886.pdf
Data publikacji:: 2012
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: ECM
electrolyte flow loss
curvilinear electrode surfaces
Opis:: This paper presents the results of research of hydraulic loss during electrolyte flow through gaps typical for ECM machining. The research was conducted on a test station where inducing an oscillatory movement of electrodes was possible. Appropriately prepared electrodes with curvilinear outlines were placed in a machining unit which allowed for measuring the pressure of the electrolyte flow in eight points on the electrode surface and also interelectrode gap inlet and outlet. Additionally, the results of pressure measurements were compared with results obtained from a computer simulation.
Źródło:: Journal of Machine Engineering; 2012, 12, 2; 86-91
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 3.

Tytuł:: Evaluation of the surface topography after precision machining
Autorzy:: Tomkowski, R.
Kacalak, W.
Lipiński, D.
Powiązania:: https://bibliotekanauki.pl/articles/99460.pdf
Data publikacji:: 2012
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: extra smooth surfaces
geometric features
surface parameters
machining
Opis:: Analysis of the geometric features and determination of the condition of the surfaces machined during an abrasive process is of crucial importance for evaluation of their wear properties. Numerous parameters can be used for assessing topography of technical surfaces. Many of them contain information that is general or poorly correlated with the wear features. The group of parameters used for such purpose should include those that do not cause information redundancy and provide distinct information. Evaluation of the surface geometric structure after precision machining is a difficult process due to the limited scope of unevenness heights that fit within the range of a few micrometers to a few nanometers. In this paper the synthetic indexes of the evaluation of extra smooth surfaces were created, taking into consideration numerous elementary parameters. The value of the synthetic index was determined as the geometric average of the partial indexes which, when compared to the arithmetic average, is more dependent on the data believed to be disadvantageous.
Źródło:: Journal of Machine Engineering; 2012, 12, 4; 71-80
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 4.

Tytuł:: Evaluation of different approaches to 3D numerical model development of the contact zone between elementary asperities and flat surface
Autorzy:: Maciolka, P.
Jedrzejewski, J.
Powiązania:: https://bibliotekanauki.pl/articles/99568.pdf
Data publikacji:: 2017
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: flat surfaces
contact
roughness
FEM
3D model
Opis:: This paper presents two triaxial finite element (FE) models: a “full model” and a “quarter model”, representing the contact between the specimen’s rough surface and the ideally smooth and flat surface of the punch. Models have a contact zone that represents the topography of the real surface and has elastoplastic properties close to those of the real contact. The contact zone was entirely modelled on the basis of roughness measurements performed on a real milled specimen made of 5083 aluminium alloy. The developmentof the FE models, the stages in their refinement and the interlinking of the contact zone with the material of the specimen are described. The results of the computed deformations occurring during the specimen contact loading with the punch were compared with the experimental results. The possible causes of the observed deviations of the computer simulation results from the experimental ones were discussed. The models were used to analyse the effect of the specimen’s material properties, i.e. Young’s modulus, yield strength, compressive strength and material hardening, on the deformations in the contact. On this basis a procedure for predicting the parameters describing the contact characteristic in cases of changes in the properties of the subsurface zone is proposed.
Źródło:: Journal of Machine Engineering; 2017, 17, 4; 40-53
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 5.

Tytuł:: Grinding and finishing sculptured surfaces using an innovative multitool head with independent pneumatic drive
Autorzy:: Baran, J.
Plichta, J.
Powiązania:: https://bibliotekanauki.pl/articles/99464.pdf
Data publikacji:: 2012
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: tribology
friction
grinding
polishing
interchangeable abrasive discs
sculptured surfaces
micromachine
Opis:: The paper presents the concept and prototypes of multitool grinding and polishing head with independent pneumatic drive for grinding and finishing large free form surfaces (FFS). Such a head facilitates selection of elastic abrasive discs, grinding process parameters and conditions, as well as proper shaping of the marks of the workpiece surface geometric structure.
Źródło:: Journal of Machine Engineering; 2012, 12, 4; 7-14
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 6.

Tytuł:: Cutting layer and cutting forces in a 5-axis milling of sculptured surfaces using the toroidal cutter
Autorzy:: Gdula, M.
Burek, J.
Powiązania:: https://bibliotekanauki.pl/articles/99538.pdf
Data publikacji:: 2017
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: sculptured surfaces
5-axis milling
cutting layer
cutting forces
toroidal cutter
Opis:: The purpose of this article was to evaluate the significance of the influence of five- axis orientation parameters of a toroidal cutter axis and the geometrical parameters of the machined sculptured surface on the intersection of the cut layer in a 5-axis machining. An impact assessment was performed by simulating concave-convex and convex-concave surfaces using a discrete method of direct transformation in a CAD environment. It was shown that only the radius of curvature of the surface in the feed direction and the angle of the tool axis affected the change in the intersection of the cutting layer. Subsequently, experimental tests were conducted that aimed at determining the mathematical models of the influence of these important parameters on the components of the cutting force. The object of the experimental studies was a convex and concave surface of a turbine blade of Inconel 718 alloy. The R300-016B20L-08L Sandvik Coromant toroid cutter was used for the tests. Based on the results of the study it was found that the lead angle in the machining of the convex surface and concave turbine blade should be continuously varied with the change of radius of curvature in the direction of the machined surface profile.
Źródło:: Journal of Machine Engineering; 2017, 17, 4; 98-122
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Informacja

Wyszukujesz frazę "surfaces" wg kryterium: Temat

Źródło danych

Dostawca treści

Kolekcja

Rok wydania

Wydawca

Temat

Autor

Typ dokumentu

Język