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Title: Nanoindentation on polymer materials
Keywords: Nanoindentation, Creep, Compliance, Retardation, Modulus, Polymer
Issue Date: 23-Jun-2004
Citation: YANG SHUANG (2004-06-23). Nanoindentation on polymer materials. ScholarBank@NUS Repository.
Abstract: This thesis presents studies on nanoindentation creep behavior of bulk and film polymeric materials at room temperature. A semi-empirical method has been established from a generalized Kelvin model. This model includes the elastic-viscoelastic-viscous effects on indentation creep. It is shown that this method can fit the experimental creep data well, to give the exact changes of creep behavior during nanoindentations for numbers of amorphous polymeric materials. A method has also been proposed to determine the elastic modulus based on this model; the elastic modulus determined from this method is independent of the holding and unloading processes of nanoindentations. Creep deformation is then used to derive creep compliance and retardation spectrums for the polymeric materials studied, which are very useful to predict other mechanical properties of polymeric materials. This model is further applied to analyze the creep behavior of polymers with different molecular weights and various crosslinking densities.
Appears in Collections:Master's Theses (Open)

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