... on the severity of observable damage. Engineering approaches attempt to minimize subjectivity by introducing standardized techniques that can quantify damage, such as microcomputed tomography analysis of retrieved polyethylene components. Methods such as these provide an objective way to measure damage and can...

... Wear of the polyethylene tibial insert remains a concern in total knee replacement (TKR) because the debris generated can lead to osteolysis and implant loosening. The purpose of this study was to determine if linear penetration is an accurate surrogate for volume loss due to creep and wear...

... From 1966 to 2009, the corrugated polyethylene pipe industry has grown from its first introduction to greater than a $2.5 × 10 9 industry in North America and from 4 in. (100 mm) only to a product diameter range of 2 in. (50 mm) through 60 in. (1500 mm). Markets have changed and grown as well...

... ASTM D 3350, Standard Specification for Polyethylene Plastics Pipe and Fittings Materials, was originally approved and published in 1974 and has increasingly been referenced in numerous F17 Piping Application Standards. This paper/presentation will review the background of the original standard...

... culverts and other buried structures typically are not inspected as frequently as above-ground structures such as bridges, the proper assessment and determination of their service life becomes very important. The design service life of corrugated high density polyethylene (HDPE) drainage pipe has been...

... of the input-to-output relationship and 69.3% predictive capability. The predictive capabilities of the network may be further enhanced by utilizing a modification of the learning algorithm. wear total knee prosthesis wear simulation polyethylene UHMWPE simulator tuning backpropagation network...

... The purpose of this study was to evaluate the wear and surface damage mechanisms of polyethylene in retrieved CHARITE total disc replacements. The retrieved implants showed evidence of adhesive/abrasive wear mechanisms in the central domed region of the implants. In addition, there was also...

... Wear testing protocols of ultrahigh molecular weight polyethylene (UHMWPE), which rely on gravimetric or topographic measurements, or both, for wear determination, are usually complicated due to fluid absorption or creep, or both, of the polyethylene samples. In this study we report...

... of polyethylene: small particles were more round, large particles were more elongated. Based on this relationship, the generated number of particles and their total surface area were estimated and compared with calculations based on size alone. wear particle characterization polyethylene hip prostheses...

... Polyethylene acetabular bearings which have been purposely cross-linked with doses of radiation above the 2.5–4 Mrads historically used for sterilization are now being implanted clinically. While there are considerable data from hip simulators that suggest that the wear rate of these new, cross...

... We hypothesized that the reduced fracture toughness associated with elevated cross-linking of ultra high molecular weight polyethylene would lead to an increase in pitting and delamination in specimens tested in a knee wear apparatus. Two blocks of compression molded polyethylene were electron...

.... Crystallinity does not change significantly. In comparison with conventional material, irradiation with 50 kGy reduces the wear rate by 73%. A further reduction of 56% can be realized by increasing the dose from 50 to 95 kGy. polyethylene ultra-high molecular weight polyethylene beta irradiation...

... The purpose of this paper is to describe the development of a new wear test protocol utilizing third body particulate debris in order to assess conventional and highly cross-linked polyethylene components. A series of tests were performed using the Boston Hip Simulator to evaluate different...

... New ultra high molecular weight polyethylene (UHMWPE) materials have been introduced that utilize elevated radiation doses combined with post-irradiation heat treatments. The elevated radiation dose creates higher levels of crosslinking and is reported to cause improved abrasive wear resistance...

... to measure the resistance to SCG in all polyethylene products. The resistance to SCG as measured by the PENT test in hours has been directly correlated with the lifetime of large scale gas pipe systems and is expected to be correlated with the lifetime of all polyethylene piping systems. The PENT resistance...

... are currently in service. Lastly, the standard should consider using the glass transition temperature to monitor changes in membranes due to aging/weathering. roofing membrane single-ply roofing thermoplastic olefin thermoplastic polyolefin TPO polyethylene polypropylene flexible polyolefin FPO...

..., including: minimal disturbance to tenants, no disturbance of asbestos materials, a pleasing visual solution and providing for future long-term wall performance. curtain wall aluminum black anodized sealant polysulfide polyethylene bond breaker backer rod silicone blind fasteners stainless...

... This study was aimed at evaluating the effect of counterpart selection on the wear rate, and the surface and subsurface properties of ultra high molecular weight polyethylene (UHMWPE). The frictional and wear properties of an implant grade UHMWPE in contact with ASTM F 1537 cobalt-based alloy...

... parts led to a viscous behavior of films with a low crystallinity and modulus. However, well-consolidated parts had a high crystallinity and modulus. polyethylene ultra-high molecular weight polyethylene molding materials compression molding process-induced effects orthopaedic medical devices...

... The existence of extraneous particles in both extruded and compression molded ultra-high molecular weight polyethylene (UHMWPE) is a leading cause of scrap during the fabrication of orthopaedic implants from the material. ASTM Specification for Ultra-High-Molecular-Weight Polyethylene Powder...