Contact creep compliance of viscoelastic materials via nanoindentation

Tweedie, Catherine A.; Vliet, Krystyn J. Van

doi:10.1557/jmr.2006.0197

Cited by 192 publications

(98 citation statements)

References 23 publications

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“…Jazouli et al [16] studied the nonlinear creep behavior of polycarbonate (PC) via uniaxial tensile creep tests at different stress levels and found that the creep compliance increases with the applied stress. Tweedie et al [9] observed that the assumption of linear viscoelasticity breaks down for several polymers (including polycarbonate and polypropylene) when creep compliance is measured via conical indentation. Oyen [17] discussed the geometrical nonlinearity and material nonlinearity for indentation of nonlinear viscoelastic solids.…”

Section: Introductionmentioning

confidence: 99%

Nanoindentation creep of nonlinear viscoelastic polypropylene

Peng

Feng

et al. 2015

Polymer Testing

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a b s t r a c tUniaxial tensile creep tests at various applied stresses were carried out to demonstrate that PP is nonlinear viscoelastic. A novel phenomenological model consisting of springs, dashpots, stress-locks and sliders was proposed to describe the nonlinear viscoelasticity. Indentation creep tests at different applied load levels were also performed on nonlinear viscoelastic PP. It was found that the shear creep compliance varies with the applied load level when the applied load is less than 5 mN, which means the indentation creep behavior was nonlinear. To find the real reason for the nonlinearity in indentation creep tests, the elastic modulus at various indentation depths was measured using continuous stiffness measurements (CSM). By analyzing the variation of elastic modulus with indentation depth, the nonlinearity of indentation creep behavior was proved to be caused by the non-uniform properties in the surface of the specimen rather than nonlinear viscoelasticity.

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Section: Introductionmentioning

confidence: 99%

Nanoindentation creep of nonlinear viscoelastic polypropylene

Peng

Feng

et al. 2015

Polymer Testing

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“…7). This is significantly lower than the thermal drift of other instruments 19 where corrections of the thermal drift must be done numerically based on thermal drift values obtained either before or after the indentation.…”

Section: Fig 4 Fused Silica Measurements At (A) 100mentioning

confidence: 87%

Novel ultra nanoindentation method with extremely low thermal drift: Principle and experimental results

Nohava¹,

Randall²,

Conté³

2009

J. Mater. Res.

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Despite active development over the past 15 years, contemporary nanoindentation methods still suffer serious drawbacks, particularly long thermal stabilization and thermal drift, which limit the duration of the measurements to only a short period of time. The presented work introduces a novel ultra nanoindentation method that uses loads from the mN range up to 50 mN, is capable of performing long-term stable measurements, and has negligible frame compliance. The method is based on a novel patented design, which uses an active top referencing system. Several materials were used to demonstrate the performance of the method. The measurements with hold at maximum load confirm extremely low levels of instrument thermal drift. The presented Ultra Nanoindentation Tester opens new possibilities for testing thin films and long-term testing, including creep of polymers at high resolution without the need of long thermal stabilization.

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“…The indenter tip penetration depth is measured during loading and unloading with a parallel plate capacitor that has sub-nanometer resolution [13]. The most common indenters include the three-sided pyramid (Berkovich) indenter, spherical indenter [14] and the flat-ended (punch) indenter [15]. The Berkovich indenter was successfully used for extracting the mechanical characteristics of individual microstructural phases in the cement paste [16].…”

Section: Nanoindentationmentioning

confidence: 99%

Investigation of Cement Matrix Compositions of Nanosilica Blended Concrete

Kim¹,

Moon²,

Youm³

et al. 2014

International Journal of Railway

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The use of pozzolanic materials in concrete mixtures can enhance the mechanical properties and durability of concrete. By reactions with pozzolanic materials and calcium hydroxide in cement matrix, calcium-silicate-hydrate (C-S-H) increases and calcium hydroxide decreases in cement matrix of concrete. Consequently, the volume of solid materials increases. The pozzolanic particles also fill spaces between clinker grains, thereby resulting in a denser cement matrix and interfacial transition zone between cement matrix and aggregates; this lowers the permeability and increases the compressive strength of concrete. Moreover, the total contents of alkali in concrete are reduced by replacing cements with pozzolanic materials; this prevents cracks due to alkali-aggregate reaction (AAR). In this study, nanosilica is incorporated in cement pastes. The differences of microstructural compositions between the hydrated cements with and without nanosilica are examined using nanoindentation, XRDA and 29 Si MAS NMR. The results can be used for a basic research to enhance durability of concrete slab tracks and concrete railway sleepers.

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Contact creep compliance of viscoelastic materials via nanoindentation

Cited by 192 publications

References 23 publications

Nanoindentation creep of nonlinear viscoelastic polypropylene

Nanoindentation creep of nonlinear viscoelastic polypropylene

Novel ultra nanoindentation method with extremely low thermal drift: Principle and experimental results

Investigation of Cement Matrix Compositions of Nanosilica Blended Concrete

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