Dynamical Mechanical Thermal Analysis of Shape-Memory Polymers

Abstract

This chapter is dedicated to the Dynamical Mechanical Thermal Analysis of Shape Memory Polymers. Temperature obviously plays a major role in the mechanical properties of these materials, hence the understanding of the physical phenomena driving the shape memory effect is of first importance for the design of practical applications in which Shape Memory Polymers are used. The Shape Memory effect being closely related to the viscoelastic behavior of the polymer, it is important to properly describe it with appropriate tools. The objective of this chapter is to describe characterization methods, models and parameters identification techniques that can be easily used for the description of the thermo-mechanical behavior of SMPs. The associated models can easily be implemented in finite element codes for time or frequency domain simulations. The experimental results and all numerical values of the models are provided for three Shape Memory Polymers: the tBA/PEGDMA and a Vitrimer, which can easily be manufactured according to the data provided in open literature, and a Shape Memory Polymer filament for 3D printing, which is available on the shelf.

Origami-based auxetic tunable Helmholtz resonator for noise control

“…Moreover, future efforts are also dedicated to the study and analysis of the adapted actuation system as well as the control of such devices. These actuation systems will probably be made from smart materials such as shape memory alloys [50] or polymers [51]. Finally, investigations on the materials to be used for the manufacturing of the origami are required, as the structural behavior is expected to play an important role in the dynamics of the system, and combining Helmholtz resonances with structural resonances could be a promising way to enhance the performances of the acoustic device [13].…”

“…Moreover, future efforts are also dedicated to the study and analysis of the adapted actuation system as well as the control of such devices. These actuation systems will probably be made from smart materials such as shape memory alloys [50] or polymers [51].…”

A three-dimensional constitutive equation for shape memory polymer composites considering energy dissipation under single loading–unloading condition

“…To obtain the coefficients for the five-term viscoelastic model in the time domain from the DMA test data in the frequency domain, the model can be converted to the frequency domain. 50 The coefficients of the viscoelastic model can be obtained by interpolating the master curve using the equation for the frequency domain elastic modulus. The coefficients for the WLF equation can be obtained by interpolating the shift factor using equation (9).…”