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Study on the surface of the polymer insert of the knee replacement using pulsed thermography

Krzywicka M., Grudziński J., Tatarczak J., Ścibisz P.

Inżynieria Materiałowa

2016

Vol. 37, nr 2

76--80

Providing of joint prostheses with high reliability is particularly important because the loss of their functional properties may cause invasive surgery revision. The main exploitation problems with prostheses are loosening (septic or aseptic) and the wear of inserts made of UHMWPE. Identification of the types and mechanisms of cooperating surfaces wear of the knee prostheses affects the improvement of materials selection, design and increase their reliability and durability. Typical kinds of damage of UHMWPE element of the prosthesis include abrasive wear, plastic deformation and creep, fatigue wear (pitting), changing the chemical composition and colour, changing in the structure, cracking. This paper presents the test results of the UHMWPE insert surface of the knee replacement which was used by the patient for 13 months. Microscopic studies, pulse thermography and 3D scanning of the UHMWPE insert were carried out. 3D scanning element has paved the way for reconstruction of the shape of the working surface of the insert of prosthesis. Surface defects in the tested insert were revealed by using innovative methods of pulsed thermography. In order to identify defects, located on the surface, microscopic studies were carried out. They have shown a complex mechanism of wear. Many signs of abrasive wear, fatigue wear (pitting) and microcracks have been observed. Analysis of the bio-bearing operation also indicates the signs of early fatigue wear. The causes of wear of tested elements include too high load applied exceeding several times the weight of the human body, closed space in which products of friction are accumulated.

Celem pracy jest określenie charakteru uszkodzeń powierzchni wkładki endoprotezy stawu kolanowego wykonanej z PE-UHMW usuniętej reoperacyjnie z powodu obluzowania aseptycznego po 13 miesiącach użytkowania z wykorzystaniem nowoczesnych technik badania powierzchni materiału.

Komputerowa analiza pracy układów prostowniczych wykorzystanych w przemyśle rolno-spożywczym

Ścibisz M., Ścibisz P.

Inżynieria Rolnicza

2010

R. 14, nr 7

199-205

W artykule opisano możliwość wykorzystania programu multiSim do analizy uszkodzeń układów prostowniczych stosowanych w przemyśle rolno-spożywczym. Opisano zaprojektowane w programie multiSim typowe układy prostowników trójfazowych i jednofazowych oraz przedstawiono wygenerowane w tym programie przebiegi wyjściowe przy braku uszkodzeń elementów prostowniczych jak i przy uwzględnieniu typowych ich uszkodzeń. Wyniki symulacyjne zostały porównane z przebiegami otrzymanymi w rzeczywistych układach. Badania potwierdziły przydatność stosowania programu symulacyjnego, ale również wykazały ograniczenia w jego wykorzystaniu.

The article describes the possibility of using the multiSlim program for analyzing damages within rectifiers used in the agricultural and food industry. Typical three-phase and one-phase rectifiers designed with the multiSlim program were described as well as output generated by this program either with no damage of the rectifier elements or with typical damage included was presented. The simulation results were compared to the courses obtained in actual systems. The tests confirmed that the simulation program is useful but also indicated limitations of its use.