News Column

Research Conducted at National Technical University Has Updated Our Knowledge about Solids Research

June 3, 2014

By a News Reporter-Staff News Editor at Journal of Technology -- Investigators discuss new findings in Solids Research. According to news reporting out of Zografos, Greece, by VerticalNews editors, research stated, "Indentation tests have long been a standard method for material characterization due to the fact that they provide an easy, inexpensive, non-destructive and objective method of evaluating basic properties from small volumes of materials. As the contact scales in such experiments reduce progressively (micro to nano-scales) the internal material lengths become important and their effect upon the macroscopic response cannot be ignored."

Our news journalists obtained a quote from the research from National Technical University, "In the present study, we derive general solutions for three basic two-dimensional (2D) plane-strain contact problems within the framework of the generalized continuum theory of couple-stress elasticity. This theory introduces characteristic material lengths in order to describe the pertinent scale effects that emerge from the underlying microstructure and has proved to be very effective for modeling microstructured materials. By using this theory, we initially study the problem of the indentation of a deformable elastic half-plane by a flat punch, then by a cylindrical indentor, and finally by a shallow wedge indentor. Our approach is based on singular integral equations which have resulted from a treatment of the mixed boundary value problems via integral transforms and generalized functions."

According to the news editors, the research concluded: "The results show significant departure from the predictions of classical elasticity revealing that it is inadequate to analyze indentation problems in microstructured materials employing only classical contact mechanics."

For more information on this research see: Some basic contact problems in couple stress elasticity. International Journal of Solids and Structures, 2014;51(11-12):2084-2095. International Journal of Solids and Structures can be contacted at: Pergamon-Elsevier Science Ltd, The Boulevard, Langford Lane, Kidlington, Oxford OX5 1GB, England. (Elsevier -; International Journal of Solids and Structures -

Our news journalists report that additional information may be obtained by contacting T. Zisis, National Technical University of Athens, Mech Div, GR-15773 Zografos, Greece. Additional authors for this research include P.A. Gourgiotis, K.P. Baxevanakis and H.G. Georgiadis.

Keywords for this news article include: Greece, Europe, Zografos, Solids Research

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Source: Journal of Technology

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