Directed Shape Morphing using Kirigami-enhanced Thermoplastics

The authors present a simple method to turn flat plastic sheets into 3D structures by combining heat-shrinkable thermoplastics with Kirigami cut patterns. The process uses only uniform heating (e.g., household ovens) and common tools like scissors. They tailor the Kirigami pattern to the desired 3D form, producing bilayer composites that morph into shapes such as bowls, pyramids, and custom ergonomic surfaces (e.g., mouse covers). The stimulus is low-information (heat applied uniformly), while the resulting complexity comes from the programmed geometry. The morphing mechanism is attributed to strain mismatch: the thermoplastic layer contracts under heat while the Kirigami layer constrains it. The behavior is confirmed by finite element simulations, and the approach is positioned as a versatile platform for adaptive design and scalable manufacturing.