Webinars
Nano-fretting: expanding the operational envelope of nano-mechanical testing
Wednesday 29th May 2013, 12:00 noon EST
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Summary
This Figure shows the data from a million cycle nano-fretting experiment on a DLC coating on a silicon substrate. The coating fails after around 450,000 cycles.
Miniaturisation of mechanical devices results in severe contact conditions generated by relatively small forces. Performance of materials at small contact scales is a significant challenge and tribology becomes an enabling technology for any small scale devices with moving components. Fretting experiments performed at small contact scales bring specific challenges including increased importance of surface energy and adhesion, role of wear particles and impact of surface roughness.
In this webinar Dr. Tomasz Liskiewicz will look at some of the latest results obtained using nano-fretting module attached to NanoTest platform. Outline of the presentation:
- Nano-fretting regime definition
- Experimental setup
- Small scale fretting of biomedical materials
- Small scale fretting of ta-C films on Silicon
- Indentation, scratch and small scale fretting on Silicon
Figure shows the load dependence of fretting tests on alloys for biomedical applications. SEM images show increased surface damage with increasing load and highlight the weakness of 316L steel to this kind of wear.
The 30 minute presentation will be followed by a more general discussion of the topic drawing on the expertise of Prof. Beake and other members of the Micro Materials applications team.
This webinar is the second in a series covering a number of different practical application areas in which nanoindentation and related techniques have helped to advance understanding.
The first talk given by Prof. Ben Beake of Micro Materials discussed the role of high temperature nano-mechanical testing in improving coatings for high speed machining applications. Future talks include Dr Peter Hosemann of UC Berkeley, who will discuss the use of nanoindentation and related techniques in characterising materials for Nuclear applications, and Dr Vineet Bhakri of the University of Western Ontario.
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For any queries or to be added to the mailing list for future webinars please contact info@micromaterials.co.uk
Speaker profile
Dr TW Liskiewicz, Technical Adviser, Charter Coating Service
Tomasz recently joined Charter Coating Service in Calgary, Canada, after working for eight years in School of Mechanical Engineering at the University of Leeds in the UK. He has background in Materials Science and expertise in Tribology and Surface Engineering including functional coatings for low friction, anti-wear and corrosion resistant applications. In Leeds he had been managing Advanced Coatings Design Lab with state of the art Physical Vapor Deposition platform. Within Charter Coating organization he is providing an expert advice on protective coatings failure analysis, coatings testing and characterization, surface preparation and functional coatings selection. Tomasz has a keen interest in the fields of biomimicry and TRIZ problem solving methods.
Appointments
2013-present: Technical Advisor/Consultant, Charter Coating Service Ltd., Calgary, Canada
2011-2012: Lecturer, School of Mechanical Engineering, University of Leeds, UK.
2006-2011: Research Council Academic Research Fellow in Engineering Design, School of Mechanical Engineering, University of Leeds, UK
2005-2006: Research Fellow, School of Mechanical Engineering, University of Leeds, UK
2004-2005: Research Fellow, Institute of Materials Engineering, Technical University of Lodz, Poland
2000-2004: PhD Student, Lodz Technical University, Poland & Ecole Centrale de Lyon, France
Professional Memberships
- Society of Vaccum Coaters, USA
- Institute of Physics(MInstP), UK
- Higher Education Academy (Fellow), UK
- Institute of Mechanical Engineers (MIMechE), UK
- Tribology Society, Poland
Recent Publications
- Lgried M, Liskiewicz T, Neville A, Electrochemical investigation of corrosion and wear interactions under fretting conditions, Wear, 2012, Vol. 282-283, Pages: 52-58
- Beake BD, Liskiewicz TW, Pickford NJ, Smith JF, Accelerated nano-fretting testing of Si(100), Tribology International, 2012, Vol: 46, Pages: 114-118
- López AM, Khazravi M, Richardson R, Dehghani A, Roshan R, Liskiewicz T, Morina A, Jayne DG and Neville A, Locomotion Selection and Mechanical Design for a Mobile Intra-abdominal Adhesion-Reliant Robot for Minimally Invasive Surgery, Lecture Notes in Computer Science, 2011, Vol.6856/2011, Pages:173-182
- Beake BD, Liskiewicz TW, Smith JF, Deformation of Si(100) in spherical contacts – Comparison of nanofretting and nano-scratch tests with nano-indentation, Surface and Coatings Technology, 2011, Vol: 206, Pages: 1921-1926
- Roshan R, Neville A, Jayne DG, Liskiewicz T, Gaskell PH, Chen L, Taylor GW, Montellano Lopez A, Morina
A, Effect of tribological factors on wet adhesion of a micro-structured surface to peritoneal tissue, Acta Biomaterialia, 2011, Vol: 7, Pages 4007-4017
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