Mapping viscoelastic and plastic properties of polymers and polymer-nanotube composites using instrumented indentation

An instrumented indentation method is developed for generating maps of time-dependent viscoelastic and time-independent plastic properties of polymeric materials. The method is based on a pyramidal indentation model consisting of two quadratic viscoelastic Kelvin-like elements and a quadratic plasti...

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Bibliographic Details
Published in:Journal of materials research 2016-08, Vol.31 (15), p.2347-2360
Main Authors: Gayle, Andrew J., Cook, Robert F.
Format: Article
Language:English
Subjects:
Analysis
Applied and Technical Physics
Biomaterials
Composite materials
Constants
Deformation
Epoxy adhesives
Indentation
Inorganic Chemistry
Mapping
Materials Engineering
Materials research
Materials Science
Mathematical models
Mechanical properties
Nanotechnology
Nanotubes
Plastic deformation
Plastic properties
Polymer matrix composites
Polymers
Studies
Viscoelasticity
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Summary:An instrumented indentation method is developed for generating maps of time-dependent viscoelastic and time-independent plastic properties of polymeric materials. The method is based on a pyramidal indentation model consisting of two quadratic viscoelastic Kelvin-like elements and a quadratic plastic element in series. Closed-form solutions for indentation displacement under constant load and constant loading-rate are developed and used to determine and validate material properties. Model parameters are determined by point measurements on common monolithic polymers. Mapping is demonstrated on an epoxy-ceramic interface and on two composite materials consisting of epoxy matrices containing multiwall carbon nanotubes. A fast viscoelastic deformation process in the epoxy was unaffected by the inclusion of the nanotubes, whereas a slow viscoelastic process was significantly impeded, as was the plastic deformation. Mapping revealed considerable spatial heterogeneity in the slow viscoelastic and plastic responses in the composites, particularly in the material with a greater fraction of nanotubes.
ISSN:0884-2914
2044-5326
DOI:10.1557/jmr.2016.207