期刊
PHILOSOPHICAL MAGAZINE
卷 94, 期 22, 页码 2505-2519出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/14786435.2014.916427
关键词
generalized Maxwell model; viscoelasticity; dynamic nanoindentation
In the last few decades, nanoindentation has gained widespread acceptance as a technique for materials properties characterization at micron and submicron length scales. Accurate and precise characterization of material properties with a nanoindenter is critically dependent on the ability to correctly model the response of the test equipment in contact with the material. In dynamic nanoindention analysis, a simple Kelvin-Voigt model is commonly used to capture the viscoelastic response. However, this model oversimplifies the response of real viscoelastic materials such as polymers. A model is developed that captures the dynamic nanoindentation response of a viscoelastic material. Indenter tip-sample contact forces are modelled using a generalized Maxwell model. The results on a silicon elastomer were analysed using conventional two element Kelvin-Voigt model and contrasted to analysis done using the Maxwell model. The results show that conventional Kelvin-Voigt model overestimates the storage modulus of the silicone elastomer by similar to 30%. Maxwell model represents a significant improvement in capturing the viscoelastic material behaviour over the Voigt model.
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