Autor: Maciołka, P. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Experimental Investigation of Flat Surfaces in Contact
Autorzy:: Maciołka, P.
Powiązania:: https://bibliotekanauki.pl/articles/99890.pdf
Data publikacji:: 2015
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: test stand
contact deformation
procedures
clamping
Opis:: This paper presents a method of measuring deformations in the contact between flat surfaces and a way of estimating the shares of elastic and plastic deformations in the total contact deformations. Experiments showed that the share of plastic deformations in the total contact deformations varied depending on the strength parameters of the specimens and the roughness parameters of the contacting surfaces, amounting to a few per cent and to 37% for respectively steel specimens and specimens made of aluminium alloy AW5754. A strategy for estimating all the deformation components for the tested specimen types and the kinds of machining is presented.
Źródło:: Journal of Machine Engineering; 2015, 15, 2; 92-104
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Modelling the behaviour of a contact layer between the workpiece and a locator
Autorzy:: Maciolka, P.
Jedrzejewski, J.
Powiązania:: https://bibliotekanauki.pl/articles/1429343.pdf
Data publikacji:: 2008
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: roughness
contact
model
Opis:: The assurance of high precision alignment of workpieces with low stiffness requires thorough knowledge about the phenomena taking place in the contact area under the influence of forces exerted by actuators. It is indispensable to utilise the model of a contact and deformations taking place in it. In order to solve the problem of contact, the contact geometry was modelled by means of a flat and rough surface model based on stereometric measurements, as well as by means of the finite element method (FEM). In a FEM method, a spherical structure of the surface layer was assumed and only one zone was taken into consideration, i.e. 0.4.Rt (maximum surface roughness). Zone structure allows easy changing of mechanical properties of material during the introduction of data defined by a strengthening curve in the plastic region. The possibility of expanding the model by consecutive zones allows taking into consideration the physical properties in complex analyses of the surface layer. This paper presents the problem of contact related to the alignment and fixing process, a model of contact deformations between a flat and a rough surface, as well as the algorithm for determining the model of a surface profile according to the bearing ratio curve.
Źródło:: Journal of Machine Engineering; 2008, 8, 3; 42-53
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

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

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Skocz do pozycji: 4.

Tytuł:: A device for the experimental investigation of surface contact under load
Autorzy:: Maciołka, P.
Jędrzejewski, J.
Grochowski, M.
Powiązania:: https://bibliotekanauki.pl/articles/99403.pdf
Data publikacji:: 2014
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: contact mechanics
asperity deformation
measurement
Opis:: The structure of a device for the investigation of the contact deformations of flat surfaces under normal load is described. The conditions, for which the device must satisfy in order to ensure normal load are defined. Errors which may occur during the loading of a rough specimen, relating to the mechanical structure of the device, the specimen itself and the measuring systems, are estimated. Finally, the device is subjected to testing which includes specimen roughness measurements before and after loading, the loading and unloading of the specimens in the device and again measuring their roughness. The device developed herein can be characterisedby its vacuum mounting method of the specimen and also by the accurate and simple loading mechanism, i.e., movable member.
Źródło:: Journal of Machine Engineering; 2014, 14, 3; 97-112
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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