文章基本信息

标题：Obtaining full contact for measuring polydimethylsiloxane mechanical properties with flat punch nanoindentation
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作者：Federico De Paoli ; Alex A. Volinsky
期刊名称：MethodsX
印刷版ISSN：2215-0161
电子版ISSN：2215-0161
出版年度：2015
卷号：2
页码：374-378
DOI：10.1016/j.mex.2015.09.004
语种：English
出版社：Elsevier
摘要：Graphical abstractAbstractProcedure to establish full contact between the sample and the 1mm diameter cylindrical flat punch tip to measure polydimethylsiloxane (PDMS) mechanical properties using the Hysitron TriboIndenter is described. This procedure differs from the standard automated indentation because each indent has to be performed manually after establishing full contact with the sample surface. Incomplete contact happens because of the sample tilt with respect to the flat punch surface and results in incorrect elastic modulus values.•Automated indentation results in incorrect values of the elastic modulus due to initial incomplete contact between the flat punch and the PDMS sample surface, caused by the tilt, and using the unloading slope, which is affected by viscoelastic soft polymer deformation.•Correct procedure requires establishing the full contact between the tip and the sample. This is achieved by moving the tip into the sample in 1–2μm increments, up to 40–80μm maximum combined displacement, until the loading stiffness no longer increases.•The elastic modulus is calculated from the loading stiffness and the diameter of the flat punch, instead of the unloading stiffness, which is larger due to viscoelastic unloading. After establishing the full contact, other mechanical testing can be conducted.
关键词：Elastic modulus;Flat punch;Full contact;Nanoindentation;Loading slope;Polydimethylsiloxane;Mechanical properties