4D Printing

Programming Shape Shifting Mechanisms

While residual stresses generated by high processing temperatures and rapid cooling are often regarded as a source of defects in fused deposition modeling (FDM), they can also be exploited to enable controlled shape transformations. By selectively reheating printed components, these stored stresses can be activated to produce predefined deformations, creating new opportunities for functional and adaptive structures. This research aims to establish a fundamental understanding of the underlying mechanisms governing stress generation and release, both qualitatively and quantitatively. The resulting insights provide the basis for predicting and controlling thermally induced shape changes, enabling the purposeful use of residual stresses as a design feature rather than a manufacturing limitation.