Superstructure Materials

Self-Locking Mechanical Superstructure Energy Absorption System

Impact loads can cause unexpected damage in various fields such as transportation, machinery, and civil engineering. These incidents often occur suddenly without prior warning, posing a serious threat to personal safety, resulting in significant economic losses, and causing severe ecological environmental damage. There is an urgent engineering need to enhance the safety and protective capabilities in these areas.

The installation of energy absorption devices as the primary protection system can absorb the majority of the impact wave energy, reducing the impact loads that the protected structure needs to withstand. This can effectively minimize the damage caused by collision accidents. Traditional energy-absorbing protection systems are often composed of thin-walled metal tubes. However, due to their extremely low friction resistance, they are prone to lateral splashing under impact loads, significantly affecting energy absorption efficiency. Complex and time-consuming additional constraints, such as welding and bolt connections, are required to prevent lateral splashing.

Self-locking energy absorption systems based on mechanical superstructures, as the basic units, can avoid lateral splashing without the need for additional constraints. They have broad application prospects. However, existing self-locking energy absorption systems mostly maintain self-locking stability only when dealing with specific directions of impact loads. They may have complex configurations, high costs, or special cross-sectional shapes that are inconvenient for disassembly and assembly, restricting their application and promotion.

Our company has designed and produced two new types of multidirectional self-locking energy absorption systems that are easy to prepare and disassemble. These systems can achieve self-locking under impact loads in multiple directions, undergo complete deformation, and stabilize energy absorption. This addresses the limitations of traditional unidirectional self-locking energy absorption systems, making them suitable for service in conditions with complex load forms.

Negative Poisson's Ratio Surface Expansion Superstructure

As one of the most studied mechanical superstructures, the surface expansion superstructure with a negative Poisson's ratio effect is a functional structural material that has rapidly developed since the 1990s. Due to the negative Poisson's ratio effect, the surface expansion superstructure exhibits various unique mechanical properties, such as extraordinary elastic constants, superior compressive indentation resistance, energy absorption performance, impact resistance, fracture toughness, and fatigue resistance. Its excellent mechanical properties make it have broad prospects in many engineering fields, attracting widespread attention from scholars at home and abroad.

Existing surface expansion superstructures are mostly block structures, and the surface expansion superstructures with a negative Poisson's ratio in the cross-section are only present in the circumferential and axial directions.

The curved surface expansion superstructure developed by our company, with a negative Poisson's ratio in the cross-section,is a new type of curved surface expansion structure. It can be applied to the exterior of cylindrical buildings for impact protection.Under the same impact load, the stress-strain ratio of cylindrical buildings protected by the curved surface expansion structure is reduced by an order of magnitude compared to structures with positive Poisson's ratio in the cross-section.