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Influencing parameters on measurement accuracy in dynamic mechanical analysis of thermoplastic polymers and their composites

Joanna Schalnat (UGent) , David Garoz Gómez (UGent) , Lode Daelemans (UGent) , Ives De Baere (UGent) , Karen De Clerck (UGent) and Wim Van Paepegem (UGent)
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Abstract
Long-term predictions of material properties such as stiffness and creep resistance are important in many engineering applications and require high reliability and accuracy. This is especially true for polymer materials and their composites as their viscoelastic nature results in time-dependent material behaviour and any measurement uncertainties or errors amplify in long-term predictions. To measure this behaviour at smallest loadings, Dynamic Mechanical Analysis (DMA) is frequently declared as an ideal method. However, the measurement accuracy and repeatability of this method is strongly influenced by (i) the testing fixture and corresponding loading mode, (ii) the sample preparation and (iii) the plotting scale to interpret the test results. In this study, relevant experimental parameters were found for DMA and a proper procedure was designed, which was then applied to measure the viscoelastic behaviour of a highly temperature and creep resistant thermoplastic polymer (polyethersulfone) and of a highly graphite filled polypropylene composite. In combination with finite element simulations and in-situ strain measurements by digital image correlation (DIC), the main influences on measurement accuracy of three-point-bending DMA were identified and subsequently used to determine measurement guidelines. Using these guidelines, DMA measurements allow quantitative determination of the viscoelastic response for rigid polymer and composite materials.
Keywords
DMA, Accuracy, Repeatability, 3-Point-bending, PESU, Technoform-PP, GUIDELINES

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MLA
Schalnat, Joanna, et al. “Influencing Parameters on Measurement Accuracy in Dynamic Mechanical Analysis of Thermoplastic Polymers and Their Composites.” POLYMER TESTING, vol. 91, 2020, doi:10.1016/j.polymertesting.2020.106799.
APA
Schalnat, J., Garoz Gómez, D., Daelemans, L., De Baere, I., De Clerck, K., & Van Paepegem, W. (2020). Influencing parameters on measurement accuracy in dynamic mechanical analysis of thermoplastic polymers and their composites. POLYMER TESTING, 91. https://doi.org/10.1016/j.polymertesting.2020.106799
Chicago author-date
Schalnat, Joanna, David Garoz Gómez, Lode Daelemans, Ives De Baere, Karen De Clerck, and Wim Van Paepegem. 2020. “Influencing Parameters on Measurement Accuracy in Dynamic Mechanical Analysis of Thermoplastic Polymers and Their Composites.” POLYMER TESTING 91. https://doi.org/10.1016/j.polymertesting.2020.106799.
Chicago author-date (all authors)
Schalnat, Joanna, David Garoz Gómez, Lode Daelemans, Ives De Baere, Karen De Clerck, and Wim Van Paepegem. 2020. “Influencing Parameters on Measurement Accuracy in Dynamic Mechanical Analysis of Thermoplastic Polymers and Their Composites.” POLYMER TESTING 91. doi:10.1016/j.polymertesting.2020.106799.
Vancouver
1.
Schalnat J, Garoz Gómez D, Daelemans L, De Baere I, De Clerck K, Van Paepegem W. Influencing parameters on measurement accuracy in dynamic mechanical analysis of thermoplastic polymers and their composites. POLYMER TESTING. 2020;91.
IEEE
[1]
J. Schalnat, D. Garoz Gómez, L. Daelemans, I. De Baere, K. De Clerck, and W. Van Paepegem, “Influencing parameters on measurement accuracy in dynamic mechanical analysis of thermoplastic polymers and their composites,” POLYMER TESTING, vol. 91, 2020.
@article{8676908,
  abstract     = {Long-term predictions of material properties such as stiffness and creep resistance are important in many engineering applications and require high reliability and accuracy. This is especially true for polymer materials and their composites as their viscoelastic nature results in time-dependent material behaviour and any measurement uncertainties or errors amplify in long-term predictions. To measure this behaviour at smallest loadings, Dynamic Mechanical Analysis (DMA) is frequently declared as an ideal method. However, the measurement accuracy and repeatability of this method is strongly influenced by (i) the testing fixture and corresponding loading mode, (ii) the sample preparation and (iii) the plotting scale to interpret the test results. In this study, relevant experimental parameters were found for DMA and a proper procedure was designed, which was then applied to measure the viscoelastic behaviour of a highly temperature and creep resistant thermoplastic polymer (polyethersulfone) and of a highly graphite filled polypropylene composite. In combination with finite element simulations and in-situ strain measurements by digital image correlation (DIC), the main influences on measurement accuracy of three-point-bending DMA were identified and subsequently used to determine measurement guidelines. Using these guidelines, DMA measurements allow quantitative determination of the viscoelastic response for rigid polymer and composite materials.},
  articleno    = {106799},
  author       = {Schalnat, Joanna and Garoz Gómez, David and Daelemans, Lode and De Baere, Ives and De Clerck, Karen and Van Paepegem, Wim},
  issn         = {0142-9418},
  journal      = {POLYMER TESTING},
  keywords     = {DMA,Accuracy,Repeatability,3-Point-bending,PESU,Technoform-PP,GUIDELINES},
  language     = {eng},
  pages        = {10},
  title        = {Influencing parameters on measurement accuracy in dynamic mechanical analysis of thermoplastic polymers and their composites},
  url          = {http://dx.doi.org/10.1016/j.polymertesting.2020.106799},
  volume       = {91},
  year         = {2020},
}

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