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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 51 for “"ultra-high molecular weight polyethylene"”.
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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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Orientation of channel die-compressed ultra-high molecular weight polyethylene
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1997.
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Mechanically Processed Alumina Reinforced Ultra-high Molecular Weight Polyethylene (UHMWPE) Matrix Composites
Alumina particles 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 …
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Wear of ultra-high molecular weight polyethylene manufactured with laser powder bed fusion
… a cobalt chromium (CoCr) femoral component and a polyethylene tibial insert that is constrained in a tibial tray. The articulation between the femoral component and tibial insert replaces the function of the natural knee joint. Advances in design, manufacturing, and materials have increased the …
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Methods for increasing the thermal conductivity of ultra-high molecular weight polyethylene (UHMWPE)
… was conducted to determine methods for producing ultra-high molecular weight polyethylene with high thermal conductivity by way of polymer chain orientation. The first portion of this report surveys current research involving polyethylene chain orientation and manufacturing. This section includes …
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Fused Deposition Modeling of Composite Reinforced by Continuous Ultra-High Molecular Weight Polyethylene Fiber
… Modeling (FDM) of composites with compliant high-strength fibers couldexpand opportunities for the design and fabrication of complex compliant structures. However, this area of additive manufacturing (AM) is currently not reported in the open literature. This study pursued developing an …
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The effect of molecular orientation on the wear of ultra-high molecular weight polyethylene
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1998.
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Feasibility of waste-derived hydroxyapatite mixed with ultra high molecular weight polyethylene composites for fused deposition modeling process
… formulation samples were characterized by their weight percentage. The feasibility of each HAp/UHMWPE composite samples has been studied by their morphology, thermal and rheology properties by using SEM/EDS, TGA/DSC and Rheology test. Formulation sample U50H50 with 50 wt.% of HAp has shown the …
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On the Influence of Gamma-Irradiation Sterilisation and Ageing on the Fracture Properties of Ultra High Molecular Weight Polyethylene
Pitting and delamination wear of ultra high molecular weight polyethylene (UHMW-PE) tibial plateaux for total joint replacements have habitually been attributed to a fatigue crack growth mechanism associated with a combination of high sub-surface cyclic shear stresses and degradation of the …
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Evaluation of hydroxyapatite (HA) from waste eggshell strengthened with ultra high molecular weight polyethylene (UHMWPE) by using injection molding process
This research presents the capability of the waste eggshell as a part of material improvement for the biomedical purpose. Hydroxyapatite ceramics (HA) has been investigated because of its excellent biocompatibility and tissue bioactivity properties. HA from the waste eggshell has been extracted …
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An assessment of polymeric materials and surface treated steels as cavitation erosion resistant materials
… components), together with the poly amides and polyethylenes, showed the highest erosion resistances. The effect of prior immersion (3 weeks at 70°C) in either a dilute or concentrated form of hydraulic fluid has been investigated for both polyacetal and ultra high molecular weight polyethylene …
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An investigation of friction and wear mechanisms in selected thermoplastics
… ball sliding on polycarbonate, rigid PVC, and ultra-high molecular weight polyethylene specimens in dry and lubricated conditions. A delay in debris formation was observed in the rigid PVC and polycarbonate dry sliding trials. In each case a higher rate of friction force increase coincided with …
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The sliding wear of polymers against steel
… steel base. The polymers investigated 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 …
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The wear behaviour of UHMWPE and ion implanted UHMWPE against differing counterfaces
… has been made of the tribological behaviour 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 …
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Surface replacement of proximal interphalangeal joint (SR-PIPJ) arthroplasty - A case series
… alloy component articulating with an ultra-high molecular weight polyethylene component. After experiencing a high rate of subsidence and complications with a pyrocarbon implant, our unit has changed to the cemented SR system in the hope of decreasing these complications. The main aim …
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Design of a low cost hydrostatic bearing
… of bearing features was cut into a flat sheet of ultra high molecular weight polyethylene which was then formed into a cylindrical shape. The shaped plastic was adhered to an aluminum housing then connected to a pump. Experimental data shows that the lumped resistance model provides a good …
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Using cold spray to package electronic implants
… implants. Two biocompatible packaging materials, ultra high molecular weight polyethylene (UHMWPE) and titanium, were cold sprayed on two different electronic material substrates, silicon and polyimide. The results from these experiments are presented in this work.
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Characterization of UHMWPE Laminates for High Strain Rate Applications
… an effort to characterize the properties 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 …
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