The Elephant Trunk Skin Inspires a Highly Sensitive and Deformable, Yet Robust, Armor Skin

Area of Science:

• Materials Science
• Robotics
• Wearable Technology

Background:

• Soft artificial skins offer high deformability and tactile sensing for electronics and robotics.
• Limited mechanical robustness hinders real-world applications of current soft electronic skins.
• A need exists for robust soft electronic skins that combine deformation, sensitivity, and ruggedness.

Purpose of the Study:

• To develop a soft electronic skin with enhanced mechanical robustness and tactile sensing capabilities.
• To mimic the hierarchical structure of elephant trunk skin for improved performance.
• To create an "armor skin" integrating stretchability, puncture resistance, and sensing.

Main Methods:

• Designed an elephant trunk-inspired armor skin with tactile sensing (ETATS).
• Utilized a folded soft substrate reinforced with aligned fibers for deformability.
• Incorporated a rigid hexagonal island array for puncture resistance and optical waveguides for sensing.

Main Results:

• ETATS demonstrates 60% stretchability and 40% lateral compressibility.
• Achieved high puncture resistance (97.5 N) and tear resistance.
• Enabled real-time, large-area pressure and lateral strain sensing via morphology-based decoupling.

Conclusions:

• The ETATS design successfully integrates high deformability, mechanical robustness, and advanced sensing.
• This bio-inspired approach maximizes stretchability, protection, and sensing performance for electronic skin.
• The developed armor skin holds significant potential for human-interactive robotics and wearable electronics.