Indentation Creep

Sargent, Philip; Ashby, MF

doi:10.1007/978-94-011-3688-4_28

Cited by 16 publications

(26 citation statements)

References 7 publications

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“…Rate effects in indentation testing have been studied in [Sargent and Ashby 1992;Larsson and Carlsson 1998;Ebenstein and Wahl 2006;Tweedie and Van Vliet 2006], for instance, but without considering size effects. The effects of cross-linking and adhesion on the determination of the elasticity modulus of polydimethylsiloxane elastomers have been studied in [Carrillo et al 2005].…”

Section: Introductionmentioning

confidence: 99%

Rate dependence of indentation size effects in filled silicone rubber

Tatiraju

Han

2010

JOMMS

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Indentation experiments at the nanometer and micrometer range reported in the literature have shown that the deformation of polymers is -similarly to metals -size-dependent. In addition its size dependence, the deformation behavior of polymers is also known to be rate-dependent. Here silicone rubber is considered. In order to characterize the relation between size and rate-dependent deformation indentation tests of silicone at indentation depths of between 30 and 300 microns and loading times of between 1 and 1000 seconds are performed. In these experiments the hardness and dissipation increased with decreasing loading time and decreasing indentation depth. These experimental results are analyzed with a recently suggested indentation model which incorporates a Frank energy-related nonlocal deformation work. It is found that the indentation model is in good agreement with the experimental data. Evaluation of the experimental data indicates that the rate effects are mostly related to the nonlocal, size-dependent deformation.

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Section: Introductionmentioning

confidence: 99%

Rate dependence of indentation size effects in filled silicone rubber

Tatiraju

Han

2010

JOMMS

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“…[1][2][3][4][5][6][7][8][9] For many such applications, it is desirable to measure nanomechanical properties at elevated temperatures (i.e., at relevant service temperatures), but nanoindentation has historically been a room-temperature mechanical testing technique. Although non-instrumented "hot hardness" tests have been used on coarser scales for decades, [10][11][12][13][14][15] experimental efforts in high-temperature indentation with load and depth instrumentation have been relatively few. A brief summary of the experimental studies on this topic to date is given in Table I, focusing on the technical conditions of the tests reported.…”

Section: Introductionmentioning

confidence: 99%

Nanoindentation and contact-mode imaging at high temperatures

2006

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Technical issues surrounding the use of nanoindentation at elevated temperatures are discussed, including heat management, thermal equilibration, instrumental drift, and temperature-induced changes to the shape and properties of the indenter tip. After characterizing and managing these complexities, quantitative mechanical property measurements are performed on a specimen of standard fused silica at temperatures up to 405 °C. The extracted values of hardness and Young's modulus are validated against independent experimental data from conventional mechanical tests, and accuracy comparable to that obtained in standard room-temperature nanoindentation is demonstrated. In situ contact-mode images of the surface at temperature are also presented.

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“…The constitutive equation for the temperature dependence of the viscoelasticity in polymer thin films is expressed by (R is the gas constant) [6].…”

Section: Power Law Equationmentioning

confidence: 99%