Principles of use of tensile J-curve materials in antagonistic arrangements.

Twisted and coiled elastomeric J-curve materials in engineered antagonistic robotic arrangements provide performance advantages over linear elastic systems by leveraging nonlinear tensile stiffness.

• Why it matters: Conventional linear or hyperelastic materials cannot independently tune mobility and damage protection, motivating design principles that separate flexibility from protectiveness.
• What they did: The work defines and measures J-curve features, quantifies effective stiffness and nonlinearity versus pre-stretch, and analyzes how the J-curve decouples flexibility from damage protection.
• The result: Experiments show twisted and coiled J-curve materials outperform linear elastic systems in antagonistic setups, and the authors outline a conceptual route to energy-efficient running in bioinspired robots.

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