HygroMetric: A Computational Framework for Hygromorphic Shape-Morphing

Key findings from this study

This research indicates that:

• 3D-printed wood structures can be computationally programmed to morph from flat sheets into complex doubly curved geometries through moisture-driven shape changes
• Simulation of anisotropic material behavior enables accurate prediction of wet and dry morphology states from deposition parameters
• Integration of material characterization with forward and inverse design reduces skill and equipment barriers for wood-based fabrication

Overview

HygroMetric is a computational framework enabling 3D printing of wood-based structures that undergo programmed shape-morphing via hydration and dehydration cycles. The system generates deposition toolpaths from flat sheet geometries and predicts resulting doubly curved, non-developable surfaces in both wet and dry states. Integration of material characterization with design intent reduces fabrication barriers for complex wooden forms.

Methods and approach

The framework characterizes anisotropic swelling and shrinkage behavior to calibrate simulation predictions. Evaluation compares corresponding point-pair distances between simulated and physically printed forms. The tool supports both forward design from geometric primitives and inverse design from target geometries. Demonstrations utilize consumer-grade 3D printing equipment.

Results

The framework successfully generates deposition strategies that produce two distinct doubly curved surfaces from initially flat printed sheets through hydration-dehydration cycles. Simulation accuracy correlates with measured material swelling and shrinkage anisotropy. The authors demonstrate primitive-based designs and three application examples showing feasibility across varied geometries and functional requirements.

Implications

Computational control of hygromorphic behavior extends design possibilities beyond traditional wood-shaping techniques such as steam bending and kerf cutting. The framework lowers entry barriers by enabling complex form generation on accessible printing equipment without specialized craft skills or dedicated infrastructure. Material-informed design strategies establish pathways for broader adoption of wood-based computational fabrication in architectural and product design contexts.

Scope and limitations

This summary is based on the study abstract and available metadata. It does not include a full analysis of the complete paper, supplementary materials, or underlying datasets unless explicitly stated. Findings should be interpreted in the context of the original publication.