In regions prone to earthquakes, materials that can absorb energy and resist sudden forces are essential. Researchers from Tohoku University and Wuhan University of Technology have developed a lightweight lattice structure inspired by butterfly wings, aimed at improving impact resistance in such conditions. Although butterflies appear fragile, their wing veins distribute stress very efficiently. The team translated this principle into a three-dimensional lattice design.

Instead of changing the base material, the researchers focused on geometry. This approach shows how internal structure can control stiffness, strength, and failure behaviour. It also aligns with current design practices that prioritise material efficiency and digital fabrication.

Improved Strength Without Additional Material

Tests and simulations show that the butterfly-inspired lattice performs better than conventional designs. It handles both static pressure and dynamic impact more effectively. The structure achieves a higher elastic modulus, improved plateau stress, and greater energy absorption.

During impact, the lattice deforms in an X-shaped pattern. This movement resembles a butterfly opening its wings. It spreads stress across the structure and prevents local failure. As a result, the structure resists sudden loads more effectively and delays collapse.

Applications In Architecture, Product Design And Mobility

This innovation offers clear potential for architecture and engineering. Designers could use similar structures in earthquake-resistant buildings or protective systems. The combination of low weight and high performance supports more resource-efficient construction.

Product and industrial designers may also benefit. The lattice could improve protective components, transport systems, or impact-resistant packaging. Its compatibility with additive manufacturing makes it suitable for customised and complex designs.

Towards More Efficient Material Use

This research reflects a broader shift towards performance-driven design. Geometry plays a key role in reducing material use while maintaining strength. Designers can achieve better results without increasing resource consumption.

Such strategies support more sustainable and circular design approaches. They reduce weight, lower emissions, and improve overall efficiency. These qualities are essential across design disciplines today.

The findings were published in the International Journal of Mechanical Sciences and made available through open access.

Source: Tohoku University
Photo: Efraimstochter