A compact fretting device for testing of biomaterials by means of thin layer activation

Schaaff, Petra; Horstmann, Wijbe; Dalmiglio, Matteo; Holzwarth, Uwe

doi:10.1016/j.wear.2006.01.004

Cited by 3 publications

(8 citation statements)

References 38 publications

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“…The basic design of the fretting testing device has been presented previously 28. A dog‐bone shaped Ti‐6Al‐4V fatigue sample is mounted in a load frame and cyclically deformed in tension and compression by a piezoelectric stack‐translator.…”

Section: Methodsmentioning

confidence: 99%

“…The high sensitivity is achieved by introducing radiotracer atoms in the tips of the fretting pads by proton irradiation. Under the conditions chosen for the present investigation only one out of 10 9 48 Ti atoms is transformed into the 48 V tracer atom via the reaction* 48 Ti 22 (p,n) 48 V 23 ; details of the irradiation conditions are reported in Ref 28…”

Section: Methodsmentioning

confidence: 99%

“…This excludes falsifications of the analysis performed on the lubricant because of material released elsewhere in the experimental set up, for example, that one released by the gripping parts of the specimens that are also immersed into the lubricant. The concentration‐depth profile of the 48 V radiotracers under the irradiation conditions has been presented in Refs 28. and30.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Fretting release experiments require a precise control of the relative displacements in the contact area in the micrometer range28–30 and a high precision in quantifying material release. Under the present experimental conditions the radiotracer method has a detection limit of 0.05 ng/mL, and is specific for material released from the irradiated area of interest 28. The experimental method that has been comprehensively treated elsewhere28 is shortly described in Materials and Methods section that deals with (i) the fretting test device, (ii) the sample geometry and preparation, (iii) the surface treatments applied to the fretting pads, (iv) the irradiation conditions of the fretting pads and the calibration, that is, the conversion of measured radioactivity in the lubricant into material release, and (v) the experimental procedures performed for the fretting release measurements and the electrochemical characterization of the surface‐treated materials.…”

Section: Introductionmentioning

confidence: 99%

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The effect of surface treatments on the fretting behavior of Ti‐6Al‐4V alloy

et al. 2007

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Stem modularity in total hip replacement introduces an additional taper joint between Ti-6Al-4V stem components with the potential for fretting corrosion processes. One possible way to reduce the susceptibility of the Ti-6Al-4V/Ti-6Al-4V interface to fretting is the surface modification of the Ti-6Al-4V alloy. Among the tested, industrially available surface treatments, a combination of two deep anodic spark deposition treatments followed by barrel polishing resulted in a four times lower material release with respect to untreated, machined fretting pad surfaces. The fretting release has been quantified by means of radiotracers introduced in the alloy surface by proton irradiation. In a simple sphere on flat geometry, the semispherical fretting pads were pressed against flat, dog-bone shaped Ti-6Al-4V fatigue samples cyclically loaded at 4 Hz. In this way a cyclic displacement amplitude along the surfaces of 20 mum has been achieved. A further simplification consisted in the use of deionized water as lubricant. A comparison of the radiotracer results with an electrochemical material characterization after selected treatments by potentiostatic tests of modular stems in 0.9% NaCl at 40 degrees C for 10 days confirmed the benefit of deep anodic spark deposition and subsequent barrel polishing for improving the fretting behavior of Ti-6Al-4V.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The effect of surface treatments on the fretting behavior of Ti‐6Al‐4V alloy

et al. 2007

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Description of an in situ method to measure the punch wear during blanking

Monteil

Roizard

Gréban

et al. 2008

Surface & Interface Analysis

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The purpose of this study is to develop a new method in order to measure the punch wear on a real stamping press during blanking. This in situ measuring method has been used for measuring the wear of tungsten carbide punches during blanking of thin copper alloy sheet steels (approximately 1/10 mm). As the quality of the final parts is largely influenced by the dimensions of the punch, the wear of the punch as low as a few micrometers must be avoided and consequently measured.So the difficulties to measure such a small wear amount on a high speed real industrial process (800 p/min) associated with the small overall dimensions of the punch is a great challenge.None of the existing measuring techniques (mainly geometrical) can ensure a continuous wear measurement without dismantling the blanking punch. The wear measurement technique developed for this study is the thin layer activation technique. The working area of the punch has been activated by means of a particles beam. The decay of the activity of the punch allows the punch wear to be monitored. Care has been taken to obtain a precise measurement of the punch wear during blanking.The results of the measurements of punch wear on an industrial stamping press are presented for various working conditions. For example, the influence of the punched material and the amount of lubrication upon the wear kinetics are described.

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Tribology research trends in Italy

Ciulli

2009

Proceedings of the Institution of Mechanical Engineers, Part J:

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This paper furnishes a survey of recent investigations and of the current tribology research trends in Italy. Several topics related to tribology are investigated in several different departments of universities, research centres and industries. Some basic studies on friction and lubrication also at the atomic-scale level are reported. A big effort is addressed to researches on surface topography, contact mechanics aspects and particularly on surface coatings and treatments. Indentation and scratching techniques are used for the characterization of both coatings and bulk materials down to the nanoscale. Mechanical characterisation of materials and material processing involve tribological aspects too. Investigations on the wear behaviour of different materials for applications in the field of biotribology are also being carried out. The increasing interest of the industrial world in tribological problems is producing a lot of collaborations among universities, research centres and industries. Several tribological components and practical applications are investigated, such as lubricated sliding bearings, gas and magnetic bearings, gears, sealing systems, automotive and rail components. Investigations are often completed by diagnostic studies for monitoring or maintenance purposes

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A compact fretting device for testing of biomaterials by means of thin layer activation

Cited by 3 publications

References 38 publications

The effect of surface treatments on the fretting behavior of Ti‐6Al‐4V alloy

The effect of surface treatments on the fretting behavior of Ti‐6Al‐4V alloy

Description of an in situ method to measure the punch wear during blanking

Tribology research trends in Italy

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