Shape-morphing into 3D curved surfaces with nacre-like composite architectures

Area of Science:

• Materials Science
• Mechanical Engineering
• Composite Materials

Background:

• Creating 3D shapes from 2D materials often compromises mechanical strength.
• Nacre's "brick and mortar" structure provides superior fracture toughness through stress redistribution.
• Existing methods for shape morphing can lead to weakened structures.

Purpose of the Study:

• To develop an optimal strategy for transforming composite plies into 3D doubly curved shapes.
• To achieve nacre-like architectures in synthetic materials for enhanced mechanical performance.
• To investigate a method for shape-conforming arbitrarily curved surfaces with high mechanical integrity.

Main Methods:

• A universal cutting and stacking strategy for composite plies was employed.
• Staggered cut distributions were implemented in multilayered laminates.
• Interlaminar shear was utilized to mitigate cut-induced mechanical weakness.

Main Results:

• Experimentally consolidated hemispherical shells with nacre-like architectures were produced.
• The developed method transforms composite plies into 3D doubly curved shapes.
• A 37% and 69% increase in compression peak forces was observed compared to random cut distributions.

Conclusions:

• The cutting and stacking strategy enables the creation of 3D shapes with enhanced mechanical properties.
• The nacre-inspired architecture effectively redistributes stress and enhances toughness.
• This approach offers a new paradigm for fabricating high-performance, arbitrarily curved 3D structures.