Reconstitution of elastic properties – New insights into the functional behavior of polymer matrix composites
November 10-14, 2019
Figure 1 – Schematic of the longitudinal elastic modulus as a function of the degree of cure
Using a combination of two complementary experimental techniques, we investigated the visco-elastic properties of thermoplastic polymeric material: poly-vinylidene fluoride (PVDF). We simultaneously measured the quasi-isothermal and adiabatic elastic moduli by setting up a miniature tensile tester on an optical table. While tensile testing (TT) yields the quasi-isothermal Young’s modulus (Fig. 1), the adiabatic shear and longitudinal moduli are derived from Brillouin light scattering (BLS) spectra.1 This two-pronged probing approach yields data, which upon detailed analysis provides for unprecedented insights into the distribution of relaxation times associated with various Maxwell elements, as well as evidence for visco-elastic property changes that require descriptions beyond these simple models.
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John Kieffer and Manon Heili, "Reconstitution of elastic properties – New insights into the functional behavior of polymer matrix composites" in "Composites at Lake Louise 2019", John Kieffer, University of Michigan, USA Erik Spoeke, Sandia National Laboratories, USA Meisha Shofner, Georgia Institution of Technology, USA Eds, ECI Symposium Series, (2019). https://dc.engconfintl.org/composites_all_2019/8