Numerical modelling of sample–furnace thermal lag in dynamic mechanical analyser

Sućeska, Muhamed; Liu, Zhiyue; Mušanić, Sanja Matečić; Fiamengo, Ivona

doi:10.1007/s10973-009-0447-z

Cited by 6 publications

(3 citation statements)

References 16 publications

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“…For the LCH sample there was the same behavior but with the tan-δ peak at 63 • C, which corresponds to the temperature at which is the value of the lowest potential energy of this sample (Figure 10A), that is, after this temperature, this sample increases its potential energy up to 82 • C. As with the LTE sample, there was an increase in the LCH stiffness, and therefore, the tan-δ peak (63 • C) corresponds to this situation. Tan-δ decreases with increasing stiffness, that is, if the material is at a constant stiffness, tan-δ will be constant (will have a zero value) [46,47].…”

Section: Discussionmentioning

confidence: 99%

HDPE Geomembranes for Environmental Protection: Two Case Studies

et al. 2020

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High-density polyethylene (HDPE) geomembranes have been used for different applications in engineering including sanitation, such as landfills and waste liquid ponds. For these applications, the material can be exposed to aging mechanisms as thermal and chemical degradation, even to UV radiation and biological contact, which can degrade the geomembrane and decrease the material’s durability. This paper aims to present an experimental evaluation of two exhumed HDPE geomembranes, the first was used for 2.75 years in a sewage treatment aeration pond (LTE sample) and another was used for 5.17 years in a municipal landfill leachate pond (LCH sample). Physical and thermal analyses were used such as thermogravimetry (TG), differential thermal analysis (DTA), differential scanning calorimetry (DSC) and dynamic mechanic analysis (DMA). The thermogravimetric analyses showed significant changes in the LCH sample’s thermal decomposition probably caused by the interaction reactions between the polymer and the leachate. For the DSC analyses, the behavior seen in the LTE sample was not observed in the LCH sample. In the DMA analyses, the behavior of the LTE sample storage module shows which LCH sample is less brittle. The LTE sample presented low stress cracking resistance and low tensile elongation at break, following the DMA results.

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Section: Discussionmentioning

confidence: 99%

HDPE Geomembranes for Environmental Protection: Two Case Studies

et al. 2020

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“…Some research has been undertaken on the accuracy of DMTA measurements and methods to improve them [35][36][37][38]. Using a different clamping system, running the experiment in a gas rather than air are potential changes that might improve the measurement.…”

Section: High Temperature Elastic Modulusmentioning

confidence: 99%

High Temperature Measurement of Elastic Moduli of (0001) Gallium Nitride

Hicks

Tabeart

Edwards

et al. 2012

Integrated Ferroelectrics

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This paper aims to review the consistency of existing GaN stiffness data and measure the high temperature elastic moduli of free-standing (0001) GaN. Dynamic mechanical thermal analysis (DMTA) and impact excitation were used to determine the E 33 elastic modulus at room temperature and at temperatures up to 550 • C. At room temperature, E 33 ranged from 304 GPa to 279 GPa depending on the specific sample and measurement method. Using DMTA and a calibration with silicon, the elastic modulus decreased by 2.17% between 100 • C and 500 • C, in close agreement with the literature. By testing samples cut at a range of crystal orientations the isotropy of the stiffness in the (0001) plane was confirmed.

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“…As with the LTE sample, there was an increase in the LCH stiffness, and therefore, the tan-δ peak (63 °C) corresponds to this situation. Tan-δ decreases with increasing stiffness, that is, if the material is rigid, tan-δ will be constant (will have a zero value) (KRONGAUZ, 2010;SUCESKA et al, 2010). Figure 73 shows the DTA curves for both samples.…”

Section: Industrial Water Pond: Cliq and 1l Samplesmentioning

confidence: 99%

Study on the durability of HDPE geomembranes applied to geotechnics and the environment using laboratory aged samples and in situ exhumed samples

Lavoie¹

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Numerical modelling of sample–furnace thermal lag in dynamic mechanical analyser

Cited by 6 publications

References 16 publications

HDPE Geomembranes for Environmental Protection: Two Case Studies

HDPE Geomembranes for Environmental Protection: Two Case Studies

High Temperature Measurement of Elastic Moduli of (0001) Gallium Nitride

Study on the durability of HDPE geomembranes applied to geotechnics and the environment using laboratory aged samples and in situ exhumed samples

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