Paper Number
PO52 

Session
Poster Session

Title
High temperature DMA characterization of glass in extension and shear modes at temperatures up to 950°C

Presentation Date and Time
October 12, 2022 (Wednesday) 6:30

Track / Room
Poster Session / Riverwalk A

Authors (Click on name to view author profile)

  1. Walluch, Matthias (Anton Paar GmbH, Rheology)
  2. Rodríguez Agudo, José Alberto (Anton Paar Germany GmbH, Rheology)
  3. Ehgartner, Daniela (Anton Paar GmbH, Rheology)
  4. Giehl, Christopher (Anton Paar Germany GmbH, Rheology)
  5. Shetty, Abhishek (Anton Paar USA Inc., Rheology Department, Advanced Technical Center)
  6. Arnold, Gunther (Anton Paar Germany GmbH, Rheology)

Author and Affiliation Lines (in printed abstract book)
Matthias Walluch1, José Alberto Rodríguez Agudo2, Daniela Ehgartner1, Christopher Giehl2, Abhishek Shetty3 and Gunther Arnold2
1Rheology, Anton Paar GmbH, Graz, Austria; 2Rheology, Anton Paar Germany GmbH, Ostfildern, Germany; 3Rheology Department, Advanced Technical Center, Anton Paar USA Inc., Ashland, VA 23005

Speaker / Presenter 
Arnold, Gunther

Keywords
experimental methods; glasses; rheometry techniques

Text of Abstract
The use of rheometer coupled with a high temperature convection oven is a typical approach to characterize the rheological behaviour of glasses at elevated temperatures. Usually the viscosity or the Young’s modulus of glasses is determined at temperatures where the rheological properties of the sample are mainly determined by viscous or elastic properties. Contrary to this, measurements at temperatures where samples show visco-elastic properties are challenging due to a myriad of reasons ranging from compliance issues (high modulus of the materials) to lack of suitable equipment available which can be used to characterize glasses in different loading modes (DMA in tension, torsion, bending). This contribution highlights a novel high temperature setup based on a standard device suitable for rheometry and dynamic mechanical analysis in different loading modes and a convection oven which characterizes glasses in different loading modes at temperatures up to 950°C. The use of DMA in shear, bending, torsion and tension mode enabled comprehensive characterization of glass from the solid, mainly elastic state up to the continuous transition into the viscoelastic state which captured the associated softening of such materials. Measurements of different glass samples with plate-plate geometry in shear, with three-point bending systems as well as torsional measurements of rectangular or circular bars are presented. The results indicate the impact of glass composition and processing conditions on DMA thermograms. Furthermore, DMA in torsion and tension was performed to determine the complex Poisson’s ratio as a function of frequency and temperature within a single test definition. Tests were performed in a frequency range from 0.1 to 10 Hz and a temperature range up to the glass transition of the sample. While variations in the frequency did not reveal significant changes of the complex Poisson’s ratio of the glass a monotonic increase of this parameter was observed when increasing the temperature.