Exploiting the temperature-memory effect in 3D printed auxetic structures

Stefano Pandini

from experimental design to analytic simulation.

The combined employ of the additive manufacturing approach with shape memory polymers (SMPs) is one of the possible strategies towards 4D-printing, in particular when aiming at the realization of highly effective shape shifting objects. SMPs are in fact active systems, capable of being temporarily fixed in a deformed configuration and to revert to the pristine shape upon application of a thermal stimulus. In addition, this response may be finely tuned by a proper combination of the thermo-mechanical history and of the material macromolecular architecture.

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Controlled shape changing components using 4D printing technology by fused filament fabrication

Bijaya Bikram Samal

The talk presents in detail 4D printing technology, its classification, and shape controlling techniques. The main focus is on using fused filament fabrication/ fused deposition modeling 3D printing for creating shape-changing structures. The mechanism of the shape memory effect and different programming strategies involved has been presented with various experimental case studies.

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4D printing of bioinspired hygromorph natural fibre composite : Green and Smart functionalities

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A presentation by Antoine le Duigou is Associate-Professor in Institut de Recherche Dupuy de Lome at Université de Bretagne Sud (Lorient France).

This presentation proposes a critical overview of the current state of 4D printing of hygromorph biocomposites for stimuli-responsive applications.
Hygromorph BioComposites (HBC) are categorized into a new class of smart materials that could be used for 4D printing of shape-changing mechanisms. Fibre anisotropic properties, fibre content and their orientation, polymer stiffness are material parameters that control the morphing. Slicing parameters during 4D printing such as Layer Height and various Interfilament Distance enable a programmation of the hygromorph biocomposites response. The potential of sequential complex actuation will be discussed.

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