PL
 |
EN
Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 5

Liczba wyników na stronie
first rewind previous Strona / 1 next fast forward last
Wyniki wyszukiwania
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 1 next fast forward last
1
Content available Overload Stress and its Influence on Durability of Ceramic Elements in Hip and Knee Joints Endoprostheses
Nabrdalik Marcin, Sobociński Michał
Archives of Metallurgy and Materials
|
2022
|
Vol. 67, iss. 2
729--734
EN
The paper presents mathematic-statistic methods defining the influence of stress on ceramic elements’ durability of hip and knee joints endoprostheses. The tests were conducted with Finite Elements Method in the ADINA System. The obtained results state the influence of load on the values of durability and stress, that get formed in ceramic parts of joints, and help to detect and solve technical problems and thus, counteract the subsequent effects resulting from premature wear of endoprosthesis elements. The paper emphasizes necessity of discovering new materials, that will be bio-compliant and wear resistant. Although ceramic materials like Al2O3, ZrO2, are brittle and less resistant to load than metallic implants, their improving mechanical parameters (excellent tribological properties), make them becoming new standard in biomaterials for clinical use. That opens new possibilities especially for hip or knee joints alloplasty.
2
Content available Numerical-Experimental Research on Some Parameters of Hip and Knee Endoprostheses, Determining Value and Form of Contact Stress Between their Elements
Nabrdalik Marcin, Sobociński Michał
Archives of Metallurgy and Materials
|
2022
|
Vol. 67, iss. 1
277--282
EN
The paper presents Finite Elements Method numerical analysis of strength of friction pairs most often used in hip and knee joints alloplasty. Analytic solutions are to indicate and define the areas where damages or premature wear of cooperating elements may occur. Analytical-experimental research states complete and thorough analysis. Accurate technical simulation of the joints of the human motor system, is difficult to conduct due to high level of complexity of human bio-bearings. All attempts to simulate the work of human joints, lead only to an approximate reflection of real human joint motion. To properly face the above problems, along with numerical analysis, there have been conducted empirical tests on the simulator of knee joint endoprosthesis.
3
Change of some parameters of UHMWPE depending on the usage
Sobociński Michał, Nabrdalik Marcin
Modelowanie Inżynierskie
|
2021
|
T. 42, nr 73
48--53
EN
Long-term storage in adverse conditions of polymer materials, initiates ageing process as it affects their useful properties. That process covers all physical and chemical conversions taking place in the structure and effects in conversion of parameters of the material. The subject of this paper was to emphasize changes in some chosen parameters of UHMWPE gained during tests conducted on friction nodes applied in endoprostheses. The frictional – wear tests have been proceeded on samples of UHMWPE paired with contra - samples made of CoCrMo and Ti6Al4V alloys. There have also been conducted Shore’s D hardness tests, as well as DSC analysis. DSC thermograms analysis shows, that the load used at friction – wear tests affected the crystallinity chase and thermal features of polyethylene.
PL
Długotrwałe przechowywanie materiałów polimerowych w niekorzystnych warunkach powoduje inicjowanie procesu starzenia. Proces ten w tym przypadku rozumiany jest jako całokształt przemian fizycznych i chemicznych zachodzących w ich strukturze, wpływających na zmianę właściwości tworzyw polimerowych. Celem pracy było wskazanie zmiany wybranych parametrów UHMWPE zebranych podczas badań prowadzonych nad skojarzeniami węzłów tarcia stosowanymi w endoprotezoplastyce. Badaniom tarciowo - zużyciowym poddano próbki wykonane z UHMWPE współpracujące z przeciwpróbkami wykonanymi ze stopu CoCrMo oraz Ti6Al4V. Przeprowadzono także badania twardości Shore'a D oraz analizę za pomocą różnicowej kalorymetrii skaningowej DSC.
4
Content available Modeling and computing of stress and strain distribution in UHMW polyethylene elements of chosen artificial human joints
Nabrdalik Marcin, Sobociński Michał
Polish Journal of Chemical Technology
|
2020
|
Vol. 22, nr 3
1--8
EN
The aim of the study was to present numerical strength analysis of the virtual knee and hip joints for the most popular tribological pairs used in prosthetic arthroplasty based on the Finite Elements Method. FEM makes it possible to calculate the stress in particular elements of the tested models. The research was dedicated to elucidate abrasive wear mechanisms during surface grinding of a polyethylene UHMW and a metal elements of endoprostheses. Strong adhesion was found between the abrasives and workpieces, which might be attributed to the chemical bonding between the abrasives and workpieces in synovial liquid. Therefore, the wear of UHMWPE is both chemical and physical. Abrasive wear effect, as a result of the abrasive wear process, is associated with material loss of the element surface layer due to the separation of particles by fissuring, stretching, or micro-cutting.
5
Content available Numerical analysis of stress distribution generated in spherical polyethylene inserts by knee joint endoprotheses’ sleds
Nabrdalik Marcin, Sobociński Michał
Polish Journal of Chemical Technology
|
2019
|
Vol. 21, nr 2
1--5
EN
The paper presents analysis of stress distribution in the friction node of knee joint endoprosthesis where sleds are made of various titanium alloys and CoCrMo cooperate with spherical polyethylene inserts. Currently used titanium alloys consists of Nb, Ta, Zr or Mo and with lesser value of Young’s modulus than Ti6Al4V alloy, or steel CoCrMo, which significantly varies from other metal materials. The obtained results make it possible to indicate the “weak points” of the accepted solution, and thus counteract the subsequent effects resulting from premature wear of endoprosthesis elements. The analysis was conducted with numerical method of ADINA System 8.6. The Finite Elements Method allowed to compute and present stress distribution quickly in all elements of the model.
first rewind previous Strona / 1 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.