ORBi: Guo Weichao - The influence of friction on elasto-plastic material in nanoindentation

Reference : The influence of friction on elasto-plastic material in nanoindentation


	Document type :	Scientific congresses and symposiums : Paper published in a book
	Discipline(s) :	Engineering, computing & technology : Mechanical engineering
	To cite this reference:	http://hdl.handle.net/2268/2824

Title :	The influence of friction on elasto-plastic material in nanoindentation
Language :	English
Author, co-author :	Guo, Weichao [Université de Liège - ULg > > > Doct. sc. ingé. (aérosp. & méca. - Bologne)]
	Ponthot, Jean-Philippe [Université de Liège - ULg > Département d'aérospatiale et mécanique > LTAS-Mécanique numérique non linéaire >]
	ZHANG, W. H. [The Key Laboratory of Contemporary Design & Integrated Manufacturing Technology, Northwestern Polytechnical University, Xi'an 710072, China > > > >]
	RAUCHS, G. [Laboratoire de Technologies Industrielles, Centre de Recherche Public Henri Tudor, L-4221 Esch-sur-Alzette, Luxembourg > > > >]
Publication date :	2008
Main document title :	Proceedings of ACOMEN’2008, Advanced Computational Methods in Engineering
Publisher :	M. Hogge, R. Van Keer, L. Noels, L. Stainier, J.-P. Ponthot, J.-F. Remacle, E. Dick
Collection and collection volume :	University of Liège, Belgium,
Pages :	14
Audience :	International
Event name :	Fourth International Conference on Advanced COmputational Methods in ENgineering (ACOMEN 2008)
Event date :	26-28 May 2008
Event place (city) :	Liège
Event country :	Belgium
Keywords :	[en] Nanoindentation ; Friction ; Piling-up or Sinking-in ; Hardness ; Finite element
Abstract :	[en] A comprehensive computational study is undertaken to identify the influence of friction in nanoindentation of elasto-plastic materials, the impacts of friction on calculation results with conical and spherical indenters are shown in this paper. The results clearly demonstrate that, for some elasto-plastic materials, the P  h curves obtained either by spherical or conical indenters with different friction coefficients cannot be distinguished. However, if utilizing the parameter  (see text for details), to quantify the deformation of piling-up or sinking-in, it is easy to find that the influence of friction on piling-up or sinking-in in nanoindentation is significant. Therefore, the material parameters derived from the projected area will have a large error caused by the influence of friction. In this paper, the maximum error on hardness can reach 14% for some elastic materials. These results do not agree with those from researchers who stated that instrumented indentation experiments are not significantly affected by friction. Moreover, in conical indentation, friction can effectively restrain the slip on the interface between indenter and specimen, which leads to a decrease in the amount of piling-up or increase in the amount of sinking-in. However, when the half apex angle is large enough, the influence of friction becomes a minor factor in indentation. In spherical indentation, the amount of piling-up decreases or of sinking-in increases with an increasing friction coefficient. But the friction is independent of the radius of spherical indenter, the piling-up or sinking-in obtained by two different spherical indenters with varying friction coefficients are nearly identical.
Target :	Researchers ; Professionals ; Students
Permalink :	http://hdl.handle.net/2268/2824

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