Indentation testing of polystyrene through the glass transition

Spinks, Geoffrey M.; Brown, Hugh R.; Liu, Z.

doi:10.1016/j.polymertesting.2006.05.012

Cited by 14 publications

(13 citation statements)

References 8 publications

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“…When the fiber content is low, the distribution of the fibers throughout the matrix is less efficient, with many matrix‐rich regions, resulting in higher C values 8. Another factor that may be associated with the increase in E ′ is the interference of neighboring segments, since there must be greater molecular cooperation for the relaxation process to occur 18…”

Section: Resultsmentioning

confidence: 99%

Mechanical and dynamic mechanical analysis of hybrid composites molded by resin transfer molding

Ornaghi

Bolner

Fiório

et al. 2010

J of Applied Polymer Sci

234

215

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This work aims to evaluate the performance of glass/sisal hybrid composites focusing on mechanical (flexural and impact) and dynamic mechanical analyses (DMTA). Hybrid composites with different fiber loadings and different volume ratios between glass and sisal were studied. The effect of the fiber length has also been investigated. The densities of the composites were compared with the theoretical values, showing agreement with the rule of mixtures. The results obtained in the flexural and impact analysis revealed that, in general, the properties were always higher for higher overall reinforcement content. By DMTA, an increase in the storage and loss modulus was found, as well as a shift to higher values for higher glass loading and overall fiber volume. It was also noticed an increase in the efficiency of the filler and the calculated activation energy for the relaxation process in the glass transition region. The fiber length did not significantly change the results observed in all analyses carried out in this work. The calculated adhesion factor increased for higher glass loadings, meaning the equation may not be applied for the system studied and there are other factors, besides adhesion influencing energy dissipation of the composites.

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Section: Resultsmentioning

confidence: 99%

Mechanical and dynamic mechanical analysis of hybrid composites molded by resin transfer molding

Ornaghi

Bolner

Fiório

et al. 2010

J of Applied Polymer Sci

234

215

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“…A range of indentation rates was considered together with three different shapes of indenter: spherical, conical and cylindrical. In 2006, a further effort in macroindentation was made by Spinks et al (2006) who studied the indentation testing of PS using a spherical indenter with 0.5 mm radius. Afterwards, in 2008, Guglielmotti et al (2008) performed macroindentation tests by means of a flat cylindrical indenter on HDPE and PA66.…”

Section: Introductionmentioning

confidence: 99%

Macroindentation of a soft polymer: Identification of hyperelasticity and validation by uni/biaxial tensile tests

Chen

Scheffer

Seibert

et al. 2013

Mechanics of Materials

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“…This work is a function of the maximum indentation depth and material. The hysteresis energy (HE) of a viscoelastic-plastic solid can be related to the loss modulus of the material as follows [27,28]:…”

Section: Hysteresis Energy Analysismentioning

confidence: 99%

Elevated temperature nanoindentation characterization of poly(para-phenylene vinylene) conjugated polymer films

et al. 2015

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a b s t r a c tTemperature dependent mechanical properties of poly(p-phenylene vinylene) (PPV) were investigated using quasi-static (QS) and dynamic nanoindentation (NI) at temperatures over the range of 25 to 100 C. The reduced modulus decreased from about 4.40 GPa to 3.64 GPa over this temperature range. The plasticity indices at all measurement temperatures were lower than the critical value of 0.875, characterizing material "sink-in", rather than "pile-up" during measurements. The plasticity index showed a non-monotonic trend, with a minimum value at around 70 C. Analysis of indentation stress relaxation data, obtained at different temperatures, was also performed using generalized Maxwell viscoelastic models. From these analyses, a relaxation mode, with a characteristic relaxation time of approximately 0.5 s, was evident. The characteristic time remained relatively unchanged over the temperature range of 25 to 100 C. However, the relaxation modulus associated with this mode showed the expected decrease with increase in temperature.

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Indentation testing of polystyrene through the glass transition

Cited by 14 publications

References 8 publications

Mechanical and dynamic mechanical analysis of hybrid composites molded by resin transfer molding

Mechanical and dynamic mechanical analysis of hybrid composites molded by resin transfer molding

Macroindentation of a soft polymer: Identification of hyperelasticity and validation by uni/biaxial tensile tests

Elevated temperature nanoindentation characterization of poly(para-phenylene vinylene) conjugated polymer films

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