Characterization of viscoelastic properties of polymeric materials through nanoindentation

Odegard, Gregory M.; Gates, Thomas S.; Herring, Helen M.

doi:10.1007/bf02428185

Cited by 213 publications

(120 citation statements)

References 17 publications

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“…White et al obtained good agreement for the storage and loss modulus from dynamic nanoindentation and rheometry for epoxy, PDMS, and PMMA. 20 Dynamic nanoindentation was used to distinguish small differences in the storage moduli of eight engineering polymers with different material densities in Odegard et al 21 In Bouaita et al several polyolefins were tested using dynamic stiffness measurement method where an alternating current (ac) signal is applied on top of the direct current (dc) actuation of a traditional nanoindentation test. 22 An alternative approach to spring-dashpot models is to characterize two independent material properties using different testing methods.…”

Section: A Current Challenges With Nanoindentationmentioning

confidence: 99%

Time-dependent mechanical characterization of poly(2-hydroxyethyl methacrylate) hydrogels using nanoindentation and unconfined compression

et al. 2008

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Hydrogels pose unique challenges to nanoindentation including sample preparation, control of experimental parameters, and limitations imposed by mechanical testing instruments and data analysis originally intended for harder materials. The artifacts that occur during nanoindentation of hydrated samples have been described, but the material properties obtained from hydrated nanoindentation have not yet been related to the material properties obtained from macroscale testing. To evaluate the best method for correlating results from microscale and macroscale tests of soft materials, nanoindentation and unconfined compression stress-relaxation tests were performed on poly-2-hydroxyethyl methacrylate (pHEMA) hydrogels with a range of cross-linker concentrations. The nanoindentation data were analyzed with the Oliver-Pharr elastic model and the MaxwellWiechert (j = 2) viscoelastic model. The unconfined compression data were analyzed with the Maxwell-Wiechert model. This viscoelastic model provided an excellent fit for the stress-relaxation curves from both tests. The time constants from nanoindentation and unconfined compression were significantly different, and we propose that these differences are due to differences in equilibration time between the microscale and macroscale experiments and in sample geometry. The MaxwellWiechert equilibrium modulus provided the best agreement between nanoindentation and unconfined compression. Also, both nanoindentation analyses showed an increase in modulus with each increasing cross-linker concentration, validating that nanoindentation can discriminate between similar, low-modulus, hydrated samples.

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Section: A Current Challenges With Nanoindentationmentioning

confidence: 99%

Time-dependent mechanical characterization of poly(2-hydroxyethyl methacrylate) hydrogels using nanoindentation and unconfined compression

et al. 2008

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“…One question concerns the utility of time-domain [3][4][5][6][7][8][9][10][11][12][13][14] versus frequency domain [15][16][17] nanoindentation measurements for best-practice mechanical characterization of time-dependent materials. A second question concerns the appropriateness of viscoelastic material models for gels or hydrated tissues, as the behavior of a fluid-saturated porous solid is more appropriately described by poroelasticity [18,19] than viscoelasticity [20].…”

Section: Introductionmentioning

confidence: 99%

Viscoelastic and poroelastic mechanical characterization of hydrated gels

et al. 2009

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Measurement of the mechanical behavior of hydrated gels is challenging due to a relatively small elastic modulus and dominant time-dependence compared with traditional engineering materials. Here polyacrylamide gel materials are examined using different techniques (indentation, unconfined compression, dynamic mechanical analysis) at different length-scales and considering both viscoelastic and poroelastic mechanical frameworks. Elastic modulus values were similar for nanoindentation and microindentation, but both indentation techniques overestimated elastic modulus values compared with homogeneous loading techniques. Hydraulic and intrinsic permeability values from microindentation tests, deconvoluted using a poroelastic finite element model, were consistent with literature values for gels of the same composition. Although elastic modulus values were comparable for viscoelastic and poroelastic analyses, timedependent behavior was length-scale dependent, supporting the use of a poroelastic, instead of a viscoelastic, framework for future studies of gel mechanical behavior under indentation.

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“…In order to determine the value of E and E from a dynamic nanoindentation experiment, the equipment supplies a controlled load to the indenter head that sets the load amplitude, while the displacement amplitude and phase angle are measured [19]. At each test site, the indenter head contacts the material's surface.…”

Section: Dynamic Mechanical Propertiesmentioning

confidence: 99%

Nanomechanical Analysis of Hybrid Silicones and Hybrid Epoxy Coatings—A Brief Review

Tiwari¹

2012

ACES

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This review article is written on the investigations of nanomechanical properties of coatings by using nanoindentation techniques. The focus is on the studies that were conducted on epoxy polymer, silicones and their hybrid materials. The article describes a large number of developmental studies that are conducted on coatings. Materials properties such as nanoindentation hardness, modulus, scratch, wear and viscoelastic behavior have been described. Moreover, the article summarizes various studies that mention the use of different nanoparticles in coating formulations that could improve the mechanical strength and service life span of the coatings. The mode and mechanism of material's failure has been outlined and discussed.

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Characterization of viscoelastic properties of polymeric materials through nanoindentation

Cited by 213 publications

References 17 publications

Time-dependent mechanical characterization of poly(2-hydroxyethyl methacrylate) hydrogels using nanoindentation and unconfined compression

Time-dependent mechanical characterization of poly(2-hydroxyethyl methacrylate) hydrogels using nanoindentation and unconfined compression

Viscoelastic and poroelastic mechanical characterization of hydrated gels

Nanomechanical Analysis of Hybrid Silicones and Hybrid Epoxy Coatings—A Brief Review

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