Soft Skins With Reversible Thickness Morphing: Materials, Mechanisms, and Applications

Area of Science:

• Materials Science
• Robotics
• Soft Matter Physics

Background:

• Soft skins with reversible thickness morphing are an emerging class of adaptive material interfaces.
• Unlike conventional soft actuators, these systems achieve out-of-plane deformation for localized control without rigid structures.

Purpose of the Study:

• To provide a comprehensive synthesis of thickness-morphing soft skins.
• To reframe thickness modulation as a material-architecture strategy for adaptive interfaces.
• To explore applications in haptic interaction and operation in confined environments.

Main Methods:

• Review of actuation stimuli, material platforms, structural architectures, and fabrication strategies.
• Synthesis of modeling frameworks and system-level integration approaches.
• Emphasis on hierarchical elastomer composites, origami/kirigami designs, and hybrid systems.

Main Results:

• Identified key enabling strategies including hierarchical composites and bio-inspired designs.
• Highlighted advancements in electrohydraulic and multimodal hybrid systems.
• Discussed emerging data-driven control approaches for expanded functional design.

Conclusions:

• Thickness morphing is a foundational strategy for next-generation haptics and soft robotics.
• Future work should address durability, energy efficiency, scalability, and integrated sensing/computation.
• Enabling self-powered, fault-tolerant, and intelligent soft skins for embodied perception and autonomous operation.