Active materials design arises as a new concept in physical design and fabrication. These materials have dynamic properties that can be activated by external stimuli, enriching physical devices' functional versatility and interactivity upon integration. Their application spans various domains, from engineering to design and art. In human-computer interaction, active materials allow computational affordances to seamlessly blend into everyday life, augmenting physical interfaces' interactions and versatility. However, as we begin to leverage active materials in physical design practices, the need for a design infrastructure also surfaces. While plentiful digital fabrication tools help us materialize ideas, designing active material systems is inherently challenging due to their novelty and dynamism. Their exotic behaviors are unfamiliar to common designers; their dynamism also requires spatiotemporal reasoning. The challenge is further exacerbated when applying active materials in real-world design problems, where the designer must simultaneously navigate constraints, opportunities, and objectives that arise from the design context. This thesis acknowledges these challenges and asks: How can computational tools support designers to work with active materials when addressing real-world, contextualized design problems?

This work synthesizes a set of computational toolmaking motifs for active materials design. The motifs administer a computational design tool's interaction with the user, empowering their ability to manipulate and reason about active materials. This dissertation advocates a shift from developing "tools that solve design problems" to "tools that help designers find solutions." These tools collaborate closely with the designer instead of automating the design process. By allowing both the computational design agent and the human designer to co-steer the course of design, both parties may do what they do best in finding satisficing solutions for complex design tasks. In this thesis, each chapter contextualizes the toolmaking motifs in different active material systems to develop proof-of-concept computational tools. The work presented here discusses the toolmaking techniques and user interactions that respond to different classes of active material design problems, as well as their implications in supporting the user's design thinking and workflow. Each project then uses the tools to develop demonstrative artifacts to validate their usefulness in helping designers address contextualized design problems. The artifacts also highlight the novel design opportunities enabled by the emergent media.

297 pages

Thesis Committee:
Lining Yao (Co-Chair, CMU/University of California, Berkeley)
Nikolas Martelaro (Co-Chair)
Scott Hudson
Takoe Igarashi (University of Tokyo)

Brad A. Myers, Head, Human-Computer Interaction Institute
Martial Hebert, Dean, School of Computer Science

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