67 research outputs found
On a Genetic Multiobjective Approach for the Integration and Optimization of Assembly Product Design and Process Planning
No full textOn the Integration and Optimization of Product Design and Process Planning Based on a Genetic Multiobjective Approach
No full textIntroduzione alle metodologie e tecniche per lo sviluppo del prodotto per la competizione basata sul tempo
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Static Coefficient of Friction Between Stainless Steel and PMMA Used in Cemented Hip Implants
No full textBackground. Design of cemented hip and knee implants, oriented to improve the longevity of artificial joints, is largely based on
numerical models. The static coefficient of friction between the implant and the bone cement is necessary to characterize the interface
conditions in these models and must be accurately provided. The measurement of this coefficient using a repeatable and reproducible
methodology for materials used in total hip arthroplasty is missing from the literature.
Methods. A micro-topographic surface analysis characterized the surfaces of the specimens used in the experiments. The coefficient of
friction between stainless steel and bone cement in dry and wet conditions using bovine serum was determined using a prototype computerized
sliding friction tester. The effects of surface roughness (polished versus matt) and of contact pressure on the coefficient of
friction have also been investigated.
Findings. The serum influences little the coefficient of friction for the matt steel surface, where the mechanical interactions due to
higher roughness are still the most relevant factor. However, for polished steel surfaces, the restraining effect of proteins plays a very
relevant role in increasing the coefficient of friction.
Interpretation. When the coefficient of friction is used in finite element analysis, it is used for the debonded stem–cement situation. It
can thus be assumed that serum will propagate between the stem and the cement mantle. The authors believe that the use of a static
coefficient of friction of 0.3–0.4, measured in the present study, is appropriate in finite element models
A contribution to the implementation of an adaptive controller for hydro-abrasive jet machining based on the generalized minimum variance method
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On the influence of PVD film of TiN and DLC in improving the cutting performance of Y-TZP surgical blades
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