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Showing 1 to 20 of 48 for “"UHMWPE"”.
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The wear behaviour of UHMWPE and ion implanted UHMWPE against differing counterfaces
… of ultra high molecular weight polyethylene (UHMWPE) and ion implanted UHMWPE during water lubricated reciprocating sliding against differing stainless steel and Yttria Partially Stabilised Zirconia (YPSZ) counterfaces. A new laboratory test apparatus was designed, built and commissioned to …
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Improved UHMWPE for use in total joint replacement
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1997.
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Piezoresistive UHMWPE WMCNT Sensors for Instrumented Total Knee Replacements
… to the ultra-high molecular weight polyethylene (UHMWPE) transforms the electrically insulating UHMWPE to a nano-composite whose resistance changes with the applied stress. A steel mold and a two-stage compression molding process were developed to instrument and hermetically seal the embedded …
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Characterization of UHMWPE Laminates for High Strain Rate Applications
… of ultra-high molecular weight polyethylene (UHMWPE). As a composite of polymers, the properties of UHMWPE are time-dependent. It is desired by research sponsors to know the properties of the material at high strain rates, in order to simulate the use of these materials in computer models. …
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The sliding wear of UHMWPE against ceramics in solutions containing proteins
… of ultrahigh molecular weight polyethylene (UHMWPE) sliding against partially stabilised zirconia (PSZ) and alumina ceramic counterfaces in various lubricating media was investigated. Wear tests were conducted in order to investigate the effect that the addition of proteins to the lubricating …
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Finite Element Analysis to Investigate Lipid Absorption in UHMWPE Under Mechanical Loading
Ultra-High-Molecular-Weight Polyethylene (UHMWPE) has long been considered the gold standard for tibial inserts in total knee arthroplasty (TKA) due to its mechanical strength, low friction, and biocompatibility. Despite advancements in crosslinking and post-irradiation stabilization, oxidative …
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Mechanically Processed Alumina Reinforced Ultra-high Molecular Weight Polyethylene (UHMWPE) Matrix Composites
… filled Ultra-high Molecular Weight Polyethylene (UHMWPE), with Al2O3 contents 0, 1, and 2.5 wt% were milled for up to 10 hours by the mechanical alloying (MA) process performed at room temperature to produce composite powders. Compression molding was utilized to produce sheets out of the milled …
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Characterization and processing of composite PP/UHMWPE filament for fused deposition modelling application
… Molecular Weight Polyethylene (PP/UHMWPE) biomaterial composite was employed to manufacture implant to reconstruct large skull bone defect using Fused Deposition Modelling (FDM). This effort aimed to reduce the cost and processing time of manufacturing of a product like this and …
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Methods for increasing the thermal conductivity of ultra-high molecular weight polyethylene (UHMWPE)
… thermoforming of UHMW-polyethylene. Sheets of UHMWPE were stretched and tested for anisotropy in thermal conductivity. For samples with draw ratios of X 10, anisotropy in thermal conductivity was observed to increase. These results show potential for future development of this proposed …
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Interactive influences of crosslinking, counterface roughness and kinematics on the wear of crosslinked UHMWPE
Ultra high molecular weight polyethylene (UHMWPE) wear debris has been shown to be a major cause of long term failure of total joint replacements. In vitro studies have shown that not only is the size and shape of the particles important for cellular response but also the volumetric concentration …
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THE PHOTOCHEMISTRY OF POLYENYL RADICALS AND ITS APPLICATION TO UHMWPE FOR USE IN ARTIFICIAL CARTILAGE
… (150 °C) to remove free radicals in irradiated UHMWPE was explored. It was found that, in contrast to the allyl free radical which is converted by 258 nm light to alkyl free radicals, polyenyl radicals are not converted to alkyl radicals by UV light. None-the-less, by sandwiching UV light …
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MECHANISTIC STUDY OF CRACK INITIATION AND PROPAGATION IN CROSSLINKED ULTRA HIGH MOLECULAR WEIGHT POLYETHYLENES (UHMWPE) SUBJECTED TO STATIC AND CYCLIC LOADING
… of ultra high molecular weight polyethylene (UHMWPE) has been successfully used for the last four decades. However, these bearing materials can fail as a result of in vivo mechanical loads. Reports suggest that the fracture resistance of UHMWPE could be improved which can help the longevity of …
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Evaluation of hydroxyapatite (HA) from waste eggshell strengthened with ultra high molecular weight polyethylene (UHMWPE) by using injection molding process
… mineral constituent. The HA then was mixed with UHMWPE inside the brabender plastograph machine to form a feedstock. In order to support the process ability of injection molding, the flow ability of the feedstock during injection molding process should be in pseudoplastic form where the viscosity …
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Wear of ultra-high molecular weight polyethylene manufactured with laser powder bed fusion
… of ultra-high molecular weight polyethylene (UHMWPE) and the entanglement of long polymer molecules prevents use of extrusion-based AM techniques such as fused filament fabrication (FFF). Hence, in this work, we use laser-powder bed fusion (L-PBF) to manufacture UHMWPE specimens. We print and …
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Feasibility of waste-derived hydroxyapatite mixed with ultra high molecular weight polyethylene composites for fused deposition modeling process
… of waste-derived hydroxyapatite (HAp) reinforced UHMWPE composites for Fused Deposition Modeling (FDM) process was investigated. Compared to the commercial HAp, derived from natural resources such as corals, fish bone and eggshells have been converted into HAp and show the similarity with the …
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Drug eluting prosthetic joints through drug cluster morphology control
… of Ultra-High Molecular Weight Polyethylene (UHMWPE), which resulted in maximized drug elution and mechanical strength retention. The optimized antibiotic eluting UHMWPE elutes antibiotic at a higher concentration for a longer period of time than antibiotic eluting bone cement while retaining …
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Micromechanics of ultra-high molecular weight polyethylene fibre composites
Ultra-high molecular weight polyethylene (UHMWPE) fibre composites are considered to be state-of-the-art materials for penetration and ballistic impact protection applications. The composites are made of strong UHMWPE fibres with a soft compliant matrix. The extreme anisotropy caused by the …
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The sliding wear of polymers against steel
… were ultra high molecular weight polyethylene (UHMWPE), ultra high molecular weight polyethylene-with a friction reducing additive (UHMWPE/FILL), polyoxymethylene (POM), poly(ethylene terephthalate) (PETP), molybdenum disulphide filled polyamide 6 (PA6/MoS₂) and graphite filled poly(amide-imide) …
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