On the Validity of Time-Temperature Equivalence for wide frequency band analysis of Shape Memory Polymers

Xavier Gabrion (1) , Emmanuel Foltete (1) , Vincent Placet (1) , Manuel Collet (1) , Morvan Ouisse (1)

1 FEMTO-ST - Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174)

Mechanical properties of Shape Memory Polymers (SMP) can exhibit decades of variations for everyday ambient conditions and classical frequency ranges of interest in the context of smart structures. For conventional polymers, the time-temperature equivalence is a very efficient tool to restrain the range of tests to be performed through the use of master curves. Dynamical Mechanical Analyses (DMA) are classically used for testing samples with various frequency and temperature values. The purpose of this study is to validate the timetemperature equivalence on a SMP sample, by performing a wide frequency band analysis combining DMA and modal tests on a structure made from the same material. Modal tests have been performed for various temperature values, and resonance frequencies have been measured and correlated to a finite element model to estimate the material elastic properties. By combining results from both tests, a poor correlation between parameters estimated from DMA and modal tests is observed, which tends to indicate that the time-temperature equivalence is not valid for the material of interest (the whole process has been successfully validated with a PP sample). Several ways are investigated to understand whether the equivalence is valid or not for the tested SMP.

Domaines: Mécanique [physics]

Xavier Gabrion, Emmanuel Foltete, Vincent Placet, Manuel Collet, Morvan Ouisse. On the Validity of Time-Temperature Equivalence for wide frequency band analysis of Shape Memory Polymers. International Conference on Smart Materials, Structures and Systems, Jun 2012, Montecatini Terme, Italy. ⟨hal-02300687⟩