This paper describes micro-Raman spectroscopy of ultra-high molecular weight polyethylene wear debris isolated from revised knee replacements. The novel application of micro-Raman spectroscopy to the analysis of in vivo-generated wear debris was used to evaluate the chemical nature of individual, retrieved polyethylene particles. The analysis revealed the presence of beta-carotene on particles ...

An experimental investigation into material transfer and wear has been performed for the case of a ferrite probe sliding at high speeds (between 25 cm/set and 1250 cm/set) and low loads (10 gm) on a steel disk, a nickel plated disk, and a polymercoated disk, the latter containing finely dispersed abrasive particles. Autoradiographic methods together with microdensitometer analysis have been app...

Being one of the most critical phases a flight, landing deserves specific attention, especially when aircraft is subject to external disturbances such as wind. A notable concern associated with touchdown events, crosswind present, tire wear. This work aimed first at developing nonlinear flight simulator able handle entire maneuver in non-null wind conditions, considering airborne phase, ground ...

Raman tweezers allow us to trap and analyze nanoparticles generated during tire abrasion brake pad friction.

To analyze the influence of suspension kinematics on tire wear, detailed simulation models are required. In this study, a non-linear, flexible multibody model rear axle system is built up in software MSC Adams/View. The physical comprises kinematics, compliance, and dynamics as well non-linear behavior using FTire model. chosen because it has separate tread to compute contact pressure friction ...

To date, life cycle assessment (LCA) does not include a methodology for assessing the impacts of plastic litter leaked to environment. This limits applicability LCA as tool compare potential single-use plastics and their alternatives on ecosystem quality human health. As contribution tackle this issue, work proposes simplified fate characterization factors (CFs) modeling two types microplastics...

The bearing couple of a polyethylene acetabular cup and a polished metal or ceramic femoral head has been a successful combination in hip arthroplasty for over 30 years, but it is now recognised that fine micron and submicron polyethylene wear particles can cause adverse cellular reactions which may lead to osteolysis and loosening. In prostheses showing high wear, the penetration of the femora...

Wear is the primary mechanism by which industrial plant deteriorates. By observing the amount and mechanism of wear periodically one is able to monitor the deterioration of plant. Traditionally this has been done by SOAP (spectrometric) analysis of used oil. In industrial drives this has a major deficiency, the most important size fraction, that is the particles above 10 microns are ignored. In...

Femoral components of hip replacements are commonly anchored in the femur with bone cement or poly(methyl methacrylate) (PMMA). Wear or fracture of bone cement can lead to loosening of the femoral component, which drastically affects the success and longevity of hip replacements. Self-reinforced composite PMMA (SRC-PMMA) has been previously developed for potential use, as a precoat material for...

Introduction The orthopaedic industry has expended significant research effort in recent years in reducing wear of UHMWPE articulating surface components. One such approach has been in the development of a heavily crosslinked polyethylene. Crosslinking for long has been known to improve the wear resistance of industrial polyethylene. Clinical experience for over 20 years and an increasing magni...