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Determining of the machine compliance using instrumented indentation test and finite element method
Authors: Zíta Dušan | Hanus Petr | Schmidová Eva | Zajíc Jakub
Year: 2018
Type of publication: článek ve sborníku
Name of source: IOP Conference Series : Materials Science and Engineering 461
Publisher name: Institute of Physics Publishing Ltd
Place: Bristol
Page from-to: 012095
Titles:
Language Name Abstract Keywords
cze Stanovení tuhosti indentačního stroje pomocí indentačních metod Článek pojednává o stanovení tuhosti indentačního stroje pomocí indentačních metod Indentační stroj, instrumentovaná indentační zkouška, metoda konečných prvků
eng Determining of the machine compliance using instrumented indentation test and finite element method At present time the importance of indentation measurements once again increases. As modern and perspective measurement method it allows to measure various mechanical properties while only needing micro volumes of materials. While standard hardness measurement methods examine only the plastic response of sampled material, Depth Sensing Indentation (DSI) testing is founded on real-time recording of applied force and resulting travel of indenter. This allows to evaluate both plastic and elastic response of examined material during the indentation process which in turn allows for calculation of various static material properties in very small volumes of samples. The big advantage of this approach is saving of time (especially on sample preparation), however the data analysis – and thus results – could be influenced by certain factors. Those worth noting are surface quality of the sample, wear of the indenter head, its shape and material, and also the compliance of testing machine’s frame. If we consider the frame of testing machine having non-zero compliance, inevitably there will occur not only displacement of indenter but also displacement of frame itself, especially noticeable while using high loads. This negatively influences the results of such measurement. This work’s aim is to calculate the compliance of test machine’s frame using Finite Element Method model and 1 mm in diameter steel ball indenter. The result of this work is addition of virtual spring to the FEM model and fine tuning of its stiffness. This should allow us to minimize the influence of frame’s compliance on the results of future measurements. Machine compliance, indentation test, finite element method

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