4 results about "Specific energy absorption" patented technology

This invention relates to a three-dimensional multi-cell structure with adjustable Poisson's ratio and specific energy absorption, and its fabrication method. The three-dimensional multi-cell structure is composed of multiple three-dimensional unit cells arranged periodically in a three-dimensional spatial coordinate system. The three-dimensional unit cells are formed by expanding two-dimensional unit cells through a first spatial transformation or a second spatial transformation. Each two-dimensional unit cell includes two quarter-concave hexagonal structures and a diagonal connecting rod. The two ends of the diagonal connecting rod are connected to a quarter-concave hexagonal structure, and the two quarter-concave hexagonal structures are symmetrical about the centroid of the diagonal connecting rod. This invention, by synergistically adjusting the geometric parameters constituting the unit cell, can flexibly control the negative Poisson's ratio and specific energy absorption of the structure on a macroscopic scale within a wide range, thereby achieving proactive design and optimization of the material's mechanical properties to meet the differentiated requirements for deformation behavior and energy absorption characteristics in different engineering scenarios.

This invention discloses a bridge collision buffer energy-absorbing structure, its processing method, and bridge collision protection facilities. The bridge collision buffer energy-absorbing structure includes a main buffer unit, secondary bridge-shaped load-bearing units, and a vertical connecting strip arranged in a two-dimensional periodic array. The main buffer unit and the secondary bridge-shaped load-bearing units are alternately connected vertically to form the main buffer strip. The vertical connecting strip is alternately connected to the main buffer strip horizontally. The main buffer unit includes a square main buffer platform at the top, with a first inclined sidewall extending downwards connected to the edge of the main buffer platform. The secondary bridge-shaped load-bearing unit includes a square bridging platform at the top, with a second inclined sidewall extending downwards connected to the two horizontal edges of the bridging platform. The lower edges of the first and second inclined sidewalls are collinear with the two sides of the vertical connecting strip. This invention has the advantages of high specific energy absorption, adjustable stiffness, and predictable deformation mode, and can effectively meet the collision protection requirements of bridges of different sizes.

The application discloses a steel-carbon fiber hybrid anti-climbing energy absorption optimization method for a track vehicle filling dot array, and comprises the following steps: establishing a finite element model of an anti-climbing energy absorption device of a track vehicle and setting design variables of a dot array energy absorption structure, generating HQLS dot array energy absorption structure samples in the range of the design variables by adopting a full factor method combined with a Latin hypercube sampling method, and generating response indexes of each sample by finite element simulation calculation; adopting a moving least square method to construct a mechanical property surrogate model, adopting a global adaptive response surface method to perform global optimization on the surrogate model, and obtaining an optimal balance solution of specific energy absorption and average crushing force based on a Pareto front, generating optimal design variables, and substituting the optimal design variables into the finite element model to verify errors; if the errors meet a preset accuracy, optimal parameters are output, otherwise, iteration is updated. The anti-climbing energy absorption optimization method can perform global optimization on the geometry and material configuration of the anti-climbing energy absorption structure of the track vehicle under the conditions of multiple parameters and multiple targets.

This invention belongs to the field of impact protection technology and relates to a double-layer thin-walled impact-resistant protective structure composed of triangular pyramidal units. This structure consists of multiple bottomless triangular pyramidal units that are alternately assembled to form a strip-like structure, which is then connected end-to-end to form a cylindrical double-layer thin-walled structure. The geometric dimensions are determined by the number of triangular pyramidal units used, which must be even and no less than six. This structure utilizes the low out-of-plane buckling stiffness of the oblique triangular facets to form a stable progressive deformation mode during axial crushing, thereby achieving high specific energy absorption capacity and low initial peak load. This structure, arranged in an array, serves as the core layer and is combined with a polyethylene non-woven fabric panel to form a "sandwich" composite protective structure. It can be used in protective equipment such as individual body armor, providing comprehensive protection against both ballistic and blunt force trauma, effectively reducing blunt force trauma damage caused by projectile impacts.