55 results about "Specific energy absorption" patented technology

The invention provides a data correction method and system combined with lattice structure additive manufacturing process characteristics, and the method comprises the steps: firstly employing a Newton iteration method, taking the radius of a pillar as a variable, optimizing the relative density of an iteration target and generating a lattice structure geometric model under the condition that a process constraint condition is satisfied, and extracting actual geometric parameters after forming through CT scanning, the elastic modulus is corrected through the pillar diameter deviation and the defect volume fraction, a compression failure mechanism is combined, a density-related failure criterion is introduced, a nonlinear relation with the relative density is constructed through specific energy absorption data, material plasticity parameters are inversely optimized, and a defect coupling evaluation model is constructed according to the surface powder sticking rate and the pillar diameter deviation. And establishing a Gaussian mixture model based on a stress-strain curve to screen out abnormal data, and finally fusing the parameters to construct a data correction model. The dot matrix structure design precision can be improved, and then a high-quality data basis is provided for performance prediction-structure design two-way feedback.

The invention discloses a novel bionic arc-shaped reinforced re-entry honeycomb structure and a platform stress theoretical model, and arc-shaped supports are embedded into traditional re-entry unit cells by utilizing a bionic principle to trigger coupling deformation of multiple plastic hinges, so that the strength, rigidity, stability and energy absorption of the structure are remarkably improved. A platform stress theoretical model of the novel structure is provided based on an energy conservation principle, so that the cost of time, workload and the like of numerical simulation and experiments in a preliminary optimization design stage of the structure is remarkably reduced. Under the parameters of the invention, the platform stress and the specific energy absorption of the reentrant honeycomb structure are up to 10.4 times that of the traditional reentrant honeycomb structure, the rigidity and the stability of the reentrant honeycomb structure are improved to 11.7 times and 1.7 times, and the stable deformation mode and the crushing force efficiency of the reentrant honeycomb structure are superior to those of the traditional reentrant honeycomb structure. The composite material is suitable for scenes requiring high energy absorption and stable impact resistance, such as the protection fields of equipment such as pier collision resistance, canal collision resistance gates, automobile collision resistance, aircraft wing buffer layers and run-flat tires in civil engineering.

The invention belongs to the technical field of aircrafts, and discloses a trigger-containing aircraft composite material energy absorption structure analysis method, which comprises the following steps: establishing an external trigger composite material structure model according to actual working conditions; constructing an intra-layer and inter-layer damage coupled progressive damage model; configuring finite element model parameters adaptive to the composite material; integrating simulation results; the crashworthiness of the coupling trigger structure is adjusted and optimized in combination with basic parameters; repeating the steps to verify the optimization effect; and predicting the strength of the composite material by coupling stress strain and damage transfer, revealing a damage failure mechanism and determining an optimal design. The method has the beneficial effects that the failure mode and the load response of the aircraft structure under different impact loads can be accurately captured, and low initial peak load and high specific energy absorption requirements are considered through multi-type triggering collaborative design; reliable technical support is provided for crashworthiness design of composite aircraft structures of aircraft fuselage frames, wing supports and other key structures in the aerospace field.

The present invention provides an embedded reinforced impact energy absorbing negative Poisson's ratio honeycomb lattice structure. The embedded reinforced impact energy absorbing negative Poisson's ratio honeycomb lattice structure comprises N embedded reinforced unit cells, each comprising a concave hexagonal unit cell structure and a sinusoidal structure embedded within the concave hexagonal unit cell structure. The embedded reinforced impact energy absorbing negative Poisson's ratio honeycomb lattice structure is formed by a periodic array of the embedded reinforced unit cells. The present invention effectively improves the compression stability, self-contact effect, specific energy absorption, and energy absorption efficiency of the negative Poisson's ratio honeycomb lattice structure, exhibiting excellent performance.

The invention discloses a vertical-horizontal mixed enhanced selective laser melting lattice structure based on a face-centered cube (FCC) and a preparation method of the vertical-horizontal mixed enhanced selective laser melting lattice structure. According to the method, starting from a basic FCC lattice unit, firstly, an in-plane enhanced transition lattice structure FCC-H (FCC-Horizon) is formed through a crossed structure of an inclined main rod and an auxiliary rod perpendicular to the main rod; the secondary auxiliary rods are distributed in a radial mode to construct a continuous bridging grid by further optimizing the rod piece connecting mode and the diameter proportion, and finally the vertical-horizontal mixed enhanced FCC-VH (FCC-Vertical Horizon) lattice structure is obtained. According to the structure, through the synergistic effect of the inclined main rods and the auxiliary rods perpendicular to the main rods, the compressive strength, the specific stiffness, the specific strength and the specific energy absorption of the structure are remarkably improved while the light weight is kept. According to an experiment, 316L stainless steel powder is adopted, an FCC-VH lattice structure is prepared through a selective laser melting (SLM) technology, the compression deformation mode of the FCC-VH lattice structure is converted into multi-node cooperative bearing from local buckling of a basic FCC, and the overall compression performance is more remarkably improved.

The invention discloses a preparation method of an automobile energy absorption box filled with a bionic double-chiral structure, and relates to the technical field of automobile collision safety. The scheme that a traditional honeycomb structure is matched with a chiral structure is further optimized, bionic optimization design of the double-chiral structure is achieved and applied to the field of automobile energy absorption boxes, and three bionic optimization structures combining the double-chiral characteristics are established. And experiments prove that through the synergistic effect of the honeycombs and the double chiral units, the peak force of the energy absorption box in the initial collision stage can be effectively reduced, and meanwhile, the specific energy absorption is remarkably improved. Under the impact load effect, the structure shows a more stable and controllable deformation mode, the instability phenomenon of a traditional energy absorption structure is avoided, and an optimized solution is provided for automobile collision safety protection.

The utility model discloses a battery pack bottom protection plate protection structure, which sequentially comprises a fiber reinforced composite plate shell, a honeycomb structure frame buffer layer and a water cooling plate from outside to inside, the honeycomb structure frame buffer layer is formed into a whole by stacking high-strength aluminum alloy pipes, and the high-strength aluminum alloy pipes are filled with internal fillers. And the internal filler is a foam material or a foam material with a non-Newtonian fluid property. The utility model further discloses a power battery system comprising the battery pack bottom protection plate protection structure and an electric automobile comprising the power battery system. The utility model has the following beneficial effects: 1, by utilizing a hierarchical strategy, the impact mechanical property of the structure is obviously enhanced, the weight of the structure is reduced, and the efficiency is improved; 2, the fiber reinforced composite board shell is high in specific energy absorption, flame-retardant, impact-resistant and low in density, and the weight of the protection structure is greatly reduced; and 3, by means of the manifold type micro-channel design, the original heat dissipation efficiency is reserved, and the thickness of the water cooling plate can be reduced.

The invention belongs to the technical field of energy-absorbing structures for protection, and particularly relates to a multi-cell energy-absorbing thin-walled tube imitating a prinsepia utilis vein. The multi-cell energy absorption thin-walled tube comprises a thin-walled tube body, a first bionic element is arranged in the thin-walled tube body in the inner circumferential direction of the thin-walled tube body, the first bionic element comprises a first round tube, small round tubes and oval tubes, the small round tubes and the oval tubes are arranged on the first round tube, and the small round tubes and the oval tubes are arranged on the tube wall of the first round tube in a pairwise continuous mode; a plurality of inner rib plates are evenly distributed in the thin-walled tube body, each inner rib plate extends to the inner wall of the thin-walled tube in the radius direction of the thin-walled tube with the axis of the thin-walled tube as the starting end, the inner rib plates are arranged between every two adjacent oval tubes and between every two adjacent small round tubes, and the two oval tubes located on the two sides of the same inner rib plate are symmetrically arranged. According to the multi-cell energy-absorbing thin-walled tube, the cross section configuration of the multi-cell tube is designed in combination with the cross section of the Wanglian vein, and compared with a traditional structure, the multi-cell energy-absorbing thin-walled tube is higher in specific energy absorption and load stability, more remarkable in energy absorption performance, convenient to manufacture and low in cost.

The invention provides a reinforcement learning-based cell-based collision energy absorption structure design method and system, and relates to the field of equipment design, and the method comprises the steps of obtaining initial design parameters of a cell-based collision energy absorption structure; constructing a cell element base structure by utilizing the initial design parameters; and based on the cell element base structure, through a deep Q network based on reinforcement learning, taking deletion of line segments in the cell elements as actions, and taking a weighted combination of average crushing force, specific energy absorption, crushing force efficiency and peak crushing force as a reward function, carrying out cyclic optimization on the cell element base collision energy absorption structure until a preset condition is met, so as to obtain the cell element base collision energy absorption structure. Optimal cell element-based collision energy absorption structure design parameters are obtained; on the basis of reinforcement learning and finite element technologies, the cell-based collision energy absorption structure with high energy absorption and low peak value is efficiently optimized.

The invention relates to a twin thin-walled beam optimization method and device for a vehicle and electronic equipment, and the method comprises the steps: building a twin thin-walled beam multi-angle crashworthiness data set based on a pre-built twin thin-walled beam finite element model; based on geometric parameters and material parameters of the twin thin-walled beam, constructing a reduction design domain meeting multiple targets; a specific energy absorption polynomial agent model and a peak force polynomial agent model are constructed on the basis of a twin thin-walled beam multi-angle crashworthiness data set, and the specific energy absorption polynomial agent model and the peak force polynomial agent model are constructed on the basis of a reduced design domain. And a preset multi-target genetic algorithm-second generation non-dominant sorting genetic algorithm NSGA-II is utilized to perform optimization to obtain optimal parameters of the twin thin-walled beam, so that the twin thin-walled beam is optimized. Therefore, the problem that a plurality of optimization targets conflict in the design process of the thin-walled beam structure in related technologies is solved, the multi-angle crashworthiness design of the twin thin-walled beam for the vehicle is realized, and the efficiency of multi-target optimization design is effectively improved.

The invention provides a ship pipeline supporting structure system preparation method and related equipment, and the ship pipeline supporting structure system preparation method comprises the following steps: obtaining a target porosity gradient and a bearing direction of a ship pipeline system, simulating the unit cell form and gradient distribution of the three-period minimum curved surface based on the target porosity gradient and the bearing direction to obtain a three-period minimum curved surface simulation result; based on the three-period minimum curved surface simulation result, constructing a three-period minimum curved surface structure through an additive manufacturing technology; and the three-period minimal curved surface structure serves as a connecting structure to be embedded into a ship pipeline supporting system. According to the technical scheme, the target porosity gradient design and the additive manufacturing technology are combined, a layered damage mechanism is achieved, and the specific energy absorption and axial bearing capacity of a ship pipeline supporting structure system is improved.

The application discloses a hierarchical cellular energy-absorbing structure with spatial staggered hierarchical bearing, which is formed by a plurality of thin-walled hierarchical cells connected by common walls or connecting walls around a central hole cavity to form a continuous closed annular hierarchical topology. The bottom ends of the cells are coplanar, and the top ends are provided with at least three discrete axial height levels, and the circumferentially adjacent cells have different heights to form non-coplanar spatial staggered hierarchical contact end faces. When axially compressed, the highest height level is first contacted and bears, and the remaining height levels are sequentially involved in crushing with compression displacement, thereby reducing the initial simultaneous bearing area. Simulation results show that, compared with a common full-height structure with the same parameters, the mass of the structure is reduced by about 39.1%, the initial peak force is reduced by about 72.7%, and the specific energy absorption is increased by about 45.6%. The application can be widely applied to vehicle cushioning, protective sandwich and lightweight impact-resistant devices.

The application provides a recycled aluminum ash hollow sphere / aluminum matrix composite foam material and a preparation method thereof, and belongs to the technical field of aluminum industrial solid waste resource recycling and metal material processing. The aluminum matrix is used instead of the resin matrix to prepare the composite foam material, and the aluminum ash is used as the hollow sphere raw material, so that the strength and specific energy absorption of the composite foam material can be significantly improved; after the metal aluminum is extracted, the hollow aluminum oxide particle content in the aluminum ash is relatively high, compared with the aluminum matrix, the hollow particle has a relatively low density, and after the aluminum ash hollow sphere is combined with the aluminum matrix, a light product can be manufactured; the obtained recycled aluminum ash hollow sphere / aluminum matrix composite foam material has the performance advantages of low density, high specific stiffness, high energy absorption capacity, excellent mechanical and acoustic damping performance and the like, and has a wide application prospect in the fields of aerospace, transportation, national defense and building.

The invention provides a high-specific-energy-absorption eutectic high-entropy alloy curved surface lattice structure additive manufacturing method which comprises the following steps: preparing a eutectic high-entropy alloy powder material, adding the eutectic high-entropy alloy powder material into a laser powder bed melting printer, and filling inert gas into the printer as shielding gas; designing a sheet-shaped TPMS lattice structure, exporting the sheet-shaped TPMS lattice structure as a slice file, and then importing the slice file into a laser powder bed melting printer; starting to print a TPMS lattice structure; and after printing is completed, the TPMS lattice structure is cut off from the substrate through linear cutting, and then the eutectic high-entropy alloy curved surface lattice structure is obtained. According to the eutectic high-entropy alloy sheet-shaped TPMS lattice structure obtained through laser powder bed melting forming, the eutectic high-entropy alloy material is applied to an energy absorption scene of the lattice structure for the first time, the energy absorption advantages of the material, the structure and the technology are combined, and compared with a traditional stainless steel lattice structure, the specific energy absorption is improved by about 50%.

The present invention relates to the technical field of mechanical negative Poisson's ratio metamaterial energy absorption technology, and in particular to a torsional negative Poisson's ratio energy absorption device based on a boundary curve and a design method thereof. The device improves specific energy absorption. The introduced curve-designed torsional boundary can absorb more energy through torsion when subjected to the impact of a load. Moreover, the boundary drives a central rotating block while torsioning. The rotation direction of the central rotating block is opposite to the torsion direction of the boundary, which can better absorb the energy brought by the load. The pillars designed with the boundary curve are adjustable. The strength and angle of the pillars can be further changed by changing the curve type and parameters, thereby changing the torsional capacity and energy absorption capacity. The stiffness can be adjusted by adjusting factors such as the period and amplitude of the boundary curve. The arc-shaped rod connecting the disk and the ring can greatly guide the torsion between the ring and the disk, thereby increasing the stiffness and energy absorption capacity.

The application discloses a preparation method of a filling bionic double-chiral structure automobile energy absorption box, and relates to the technical field of automobile collision safety. The application further optimizes the scheme of combining the traditional honeycomb structure with the chiral structure, realizes the bionic optimization design of the double-chiral structure and applies the bionic optimization design to the field of the automobile energy absorption box, and three bionic optimization structures combining the double-chiral features are established. It is proved through experiments that the synergistic effect of the honeycomb and the double-chiral unit can effectively reduce the peak force of the energy absorption box in the initial stage of the collision, and the specific energy absorption is significantly improved. Under the action of the impact load, the structure exhibits a more stable and controllable deformation mode, and the instability phenomenon of the traditional energy absorption structure is avoided, so that an optimized solution is provided for the automobile collision safety protection.

The invention discloses a carbon nanotube composite material as well as a preparation method and application thereof. The carbon nano tube composite material comprises an energy absorption layer serving as a middle layer, and an anti-impact layer and a sunken part reducing layer which are arranged on the two sides of the energy absorption layer respectively. The energy absorption layer comprises a plurality of layers of carbon nanotube films which are arranged in a laminated manner; each of the anti-impact layer and the sunken part reducing layer comprises at least one of a UHMWPE (Ultra High Molecular Weight Polyethylene) fiber layer, a Kevlar fiber layer and a PBO (Poly (p-phenylene benzobisoxazole)) fiber layer. According to the carbon nano tube composite material provided by the invention, performance advantages of various materials are fully played mainly through collaborative design of various materials, a collaborative protection and layered energy absorption mechanism is formed, and the carbon nano tube composite material has excellent impact resistance, is superior to a traditional single fiber material in key performance aspects such as a V50 value, a specific energy absorption index and concave depth, and has good application prospects. The cable has excellent high and low temperature resistance, humidity and heat resistance, acid and alkali resistance and salt spray corrosion resistance, is suitable for various extreme service environments, and is suitable for individual protection equipment such as body armor and stab-resistant clothing.

The invention discloses a transition interval type bionic spiral damping structure, and relates to the field of mechanical vibration and noise reduction, the transition interval type bionic spiral damping structure comprises a combination body and metal panels arranged at the two ends of the combination body, and the combination body is formed by stacking and rotating a plurality of transition interval damping single-layer structures layer by layer; the transition interval damping single-layer structure comprises a plate-shaped damping layer and an interval type transition layer arranged above the plate-shaped damping layer. The interval type transition layer comprises a plurality of long strips which are horizontally arranged, and equal distances are arranged between the long strips. The transition interval type bionic spiral damping structure has the advantages of excellent impact resistance, convenience in thickness control, light weight, high specific energy absorption and higher material adaptability.

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.

The invention relates to a double-layer multi-cell energy absorption thin-walled tube with a pre-folded outer wall. The double-layer multi-cell energy absorption thin-wall pipe comprises a thin-wall inner pipe, a thin-wall outer pipe and an inner rib plate which are arranged in a nested mode. The thin-wall inner pipe and the thin-wall outer pipe are repeatedly connected in the axial direction of the pipe through N layers of unit cell structures. Each layer of unit cell structure comprises a double-layer thin-wall outer tube and an inner square tube which is connected up and down, and an inner rib plate structure which forms an included angle is connected between the vertical center line of each side wall of the inner square tube and the double-layer thin-wall outer tube; the double-layer thin-wall outer pipe comprises a first unit wall plate and a second unit wall plate which are symmetrical in the circumferential direction of the thin-wall pipe. The first unit wall plate is defined by a double-layer first trapezoidal wall plate and double-layer parallelogram wall plates arranged on the two sides of the first trapezoidal wall plate, the second unit wall plate is a double-layer second trapezoidal wall plate arranged between the first unit wall plates, and the double-layer thin-wall outer pipe is formed by pre-folding a plurality of peak creases and valley creases. Compared with an existing thin-walled tube, the double-layer multi-cell energy absorption thin-walled tube has the advantages that the specific energy absorption is more obviously improved, the compression resistance advantage is obvious, and the application range is wider.

The invention provides an aircraft composite material dot matrix interlayer energy absorption structure and a performance prediction method thereof, and belongs to the technical field of composite materials. A stretching-dominated octagonal truss dot matrix is used as a basic dot matrix structure, stretching-dominated and bending-dominated body-centered cubic dot matrixes and simple cubic dot mechanical characteristics are fused to strengthen mechanical properties, a new mixed dot matrix structure is formed, and an optimal arrangement strategy of the dot matrix structure is established and inspired by a bionic bone microstructure. The characteristics of the two lattice structures are combined, the mechanical properties of the sandwich structure are effectively improved, the sandwich structure has higher peak load, average load and specific energy absorption and more stable crushing force efficiency, a prediction model of the effective rigidity and relative density of the two-phase lattice is established, the customized mechanical properties are effectively achieved, and the application range of the sandwich structure is widened. And the application of the lattice sandwich structure in an aircraft structure is widened.

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 invention relates to a double-layer pyramid interlayer energy absorption structure for an automobile, and relates to the field of automobile passive safety protection. Comprising an interlayer panel and a sandwich, the sandwich panel and the sandwich core adopt epoxy resin as an adhesive; the interlayer panel is made of a carbon fiber reinforced composite material and comprises four layers of carbon fiber plates, each layer of carbon fiber plate is formed by laying three layers of carbon fiber layers, the thickness of each layer of carbon fiber plate is the same, and the laying angle of each layer of carbon fiber plate can be freely designed. The sandwich structure is low in initial peak force, excellent in energy absorption performance and stable in deformation mode, the defects of a traditional sandwich structure in the aspects of specific energy absorption, light weight level, total energy absorption capacity and deformation stability are overcome, and therefore impact damage to passengers is reduced to the maximum extent when a vehicle collides.

The utility model provides a machine tool stand column, and relates to the technical field of machine tool stand columns, the machine tool stand column comprises a first connecting part and a second connecting part, the first connecting part is located right above the second connecting part, and side plates are arranged on the two sides of the first connecting part and the two sides of the second connecting part respectively. The inner side faces of the two side plates are each provided with a honeycomb-shaped first reinforcing part, the two sides of the first connecting part and the two sides of the second connecting part are provided with a ring plate and a baffle correspondingly, and the four side portions of each first reinforcing part are connected with the first connecting part, the second connecting part, the ring plate and the baffle correspondingly. The machine tool stand column can have excellent specific stiffness, specific strength and specific energy absorption, material use is reduced, material cost is saved, movement is convenient, meanwhile, occupied space can be reduced, and the machine tool stand column has sound absorption and heat dissipation effects and is good in use effect.

The present invention discloses an impact-resistant cloverleaf-shaped energy absorption box, which belongs to the technical field of automobile collision energy absorption structures and includes an energy absorption box body, a connecting plate, a fixing plate and a buffer gasket. The energy absorption box body includes cloverleaf ribs, a shell, a filling body, a partition and a support spring. In order to overcome the shortcomings of existing energy absorption boxes, such as the overly simple structure and the unreasonable setting of the ribs, which result in low specific energy absorption and high maintenance and replacement costs when a car collides, the present cloverleaf-shaped energy absorption box has a different deformation mode from the existing energy absorption box. The ribs form multiple folds during the folding and deformation process. These folds interact with each other along the length direction of the energy absorption box body and interact with each other in the lateral direction, thereby improving the impact resistance performance. At the same time, the present cloverleaf-shaped energy absorption box has a large elastic working range, and the connection position between the fixing plate and the vehicle body longitudinal beam can also be readjusted, thereby reducing the replacement frequency of the energy absorption box and saving costs.

The application provides a kind of composite armor of bionic structure and its preparation method, including sequentially superimposed bulletproof layer, transition layer and energy absorption layer, bulletproof layer includes titanium alloy panel and a plurality of ceramic hemispheres, adhesive and low surface density high performance fiber woven fabric or prepreg are used between the two to bond.The application simulates the macro-micro organization framework of the nacre layer of shell, so that the composite armor has the characteristics of high specific energy absorption, can resist multiple high-speed impacts, the hemispherical convex structure of titanium alloy panel can effectively protect multiple bullet types, each independent ceramic hemisphere does not affect each other, high-hardness ceramic hemisphere can blunt and grind the projectile, the cambered surface design of bulletproof layer can change the penetration direction of the projectile, the ceramic hemisphere can make the failure mode deflect between layers, greatly improving the multi-hit bullet performance of the armor plate.

The invention relates to the technical field of automobiles, in particular to a rotary semi-rigid hierarchical honeycomb filled energy absorption box which comprises an energy absorption box shell and a rotary semi-rigid hierarchical honeycomb structure, the energy absorption box shell is filled with the rotary semi-rigid hierarchical honeycomb structure, and the stretching direction of the rotary semi-rigid hierarchical honeycomb structure is perpendicular to the loading direction; the rotary semi-rigid hierarchical honeycomb structure is composed of rotary semi-rigid honeycombs and hierarchical subunits, and the hierarchical subunits are embedded in hollow rectangles of the rotary semi-rigid honeycombs. Through numerical simulation and comparison of frontal collision of the energy absorption box, key indexes such as total energy absorption, average impact force and specific energy absorption of the honeycomb filling structure are improved to different degrees under the same impact speed; and when the relative density of the honeycomb is consistent and the impact speed is the same, the energy absorption of the filled hierarchical honeycomb is the highest. Compared with a traditional automobile energy absorption box, the automobile energy absorption box has the obvious advantages in the aspect of impact resistance.

The application discloses a dual-phase buffer energy-absorbing metamaterial structure, which is used for bearing load and buffering and absorbing impact energy and is composed of a plurality of same metamaterial unit cells which are regularly connected and arranged; the unit cell is formed by mutual embedding of a main phase and a reinforcing phase; the main phase is composed of triangular corrugated structures which are symmetrically arranged upward and downward and are equidistantly arranged in different directions based on excellent mechanical properties of the triangular corrugated structures; the reinforcing phase is connected by a center plate and symmetrically arranged trapezoidal plates; the transverse expansion and buckling deformation of the wall plate of the main phase are inhibited and the vertical direction strength of the main phase unit cell is improved by introducing the reinforcing phase; the two-phase structure which is embedded in each other can keep the relative position of the two phases in the vertical direction and can greatly improve the mechanical properties of the novel metamaterial on the basis of the main phase; and the application has excellent mechanical properties including strain energy, specific energy absorption, crushing force efficiency and specific strength.

The invention relates to the technical field of automobile safety parts, and discloses an automobile anti-collision beam based on a continuous fiber printing negative Poisson's ratio structure and a manufacturing method thereof.The automobile anti-collision beam is composed of continuous carbon fibers and thermosetting resin, and a core layer with the negative Poisson's ratio effect is integrally formed in the anti-collision beam; according to the manufacturing method, continuous fiber additive manufacturing equipment is adopted, continuous carbon fibers and a resin matrix are synchronously extruded and subjected to in-situ impregnation, an anti-collision beam green body with the core layer is formed through layer-by-layer stacking, and finally the anti-collision beam green body is cured and formed. According to the negative Poisson's ratio structure, the pulling and expanding energy absorption mechanism of the negative Poisson's ratio structure is combined with the high bearing capacity of continuous fibers, the weak interface of traditional assembly is eliminated through the integrated additive manufacturing technology, and the technical problems that energy absorption efficiency and light weight are difficult to consider at the same time, and stress concentration exists in the structure are effectively solved; the prepared anti-collision beam has higher specific energy absorption, excellent structural integrity and light weight level.

The utility model relates to an elliptical conical foamed aluminum energy absorption structure suitable for a multi-angle impact working condition, which is characterized in that an AA6063T5 aluminum alloy elliptical conical pipe forms a shell, and an industrial-grade closed-cell foamed aluminum material with the density of 0.25-0.4 g / cm < 3 > is filled in the shell in a layered manner to form a gradient density energy absorption core. Under the working condition of axial impact, the gradient foamed aluminum realizes layer-by-layer transmission and absorption of impact load; under the lateral impact working condition of 0-30 degrees, the elliptical cross section structure is beneficial to tangential diffusion of impact energy, and local stress concentration and damage are relieved. The structure shows excellent energy management capability under a multi-angle impact condition through geometric shape optimization and multi-stage material combination. Multi-index evaluation based on an entropy weight method shows that the structure has lower peak breaking force and higher specific energy absorption capacity under axial and bias impact conditions, and has good engineering adaptability and safety guarantee potential.