66 results about "Mechanical metamaterial" patented technology

The invention relates to a mechanical metamaterial structure based on a six-rod and six-cable tensegrity structure, and belongs to the field of mechanical metamaterials, the mechanical metamaterial structure comprises a six-rod and six-cable tensegrity cell structure, and the tensegrity cell structure comprises corner assemblies, first connecting shafts, fixing rings and middle tensegrity assemblies; under the action of the middle tensioning assembly, when the structure is not subjected to an external load, the structure is subjected to interaction of internal stress, and the balance is achieved in a self-stabilization state; under the state of being subjected to an external load, the structure can generate self-adaptive deformation; and the external load is removed again, and the structure can recover to the initial state. The mechanical metamaterial structure based on the six-rod six-cable tensegrity structure has the advantages of adaptivity, isotropy, negative Poisson's ratio and the like, the tensegrity structure and the mechanical metamaterial structure are combined, and the types of existing mechanical metamaterial cell element structures are enriched; and a brand new direction is opened up for the design, analysis and application of the tensioning mechanical metamaterial structure.

The invention relates to the technical field of computer aided design, and provides a mechanical metamaterial generative reverse design method and device, and the method comprises the steps: generating a basic microstructure data set based on a k-uniform tiling algorithm and a Voronoi diagram generation algorithm, obtaining a microstructure data set through seed translation, local weight variance increase and global weight variance modification and expansion; performing full-field finite element simulation on microstructure samples in the microstructure data set to obtain a physical field video data set; constructing a video diffusion model, training the video diffusion model by taking the physical field video data set as training data, and taking the trained video diffusion model as a microstructure generator; and the microstructure generator carries out structural design and evaluation according to the input target performance index, and outputs an optimal microstructure. According to the method, under the constraint of physical field video data, the corresponding relation between the nonlinear mechanical response and the complex geometric configuration can be accurately learned, and unification of physical consistency and structural innovation is achieved.

The invention discloses a mechanical metamaterial cell element with a zero Poisson's ratio property, and belongs to the technical field of mechanical metamaterials. The upper top plate and the lower bottom plate are symmetrically arranged, the upper cleat nail set and the lower cleat nail set are arranged at the four corners of the inner side faces of the upper top plate and the lower bottom plate, the elastic body set is connected through the upper cleat nail set and the lower cleat nail set, and the flexible hinge component set is arranged at the midpoint position of four side lines of the upper top plate and the lower bottom plate. The flexible hinge component set keeps inward pre-bending through the pre-tension of the elastomer set, and when the cell element bears an axial load, the flexible hinge component set generates coordinated inward bending deformation, so that the cell element shrinks in the axial direction, the transverse size is kept stable, the axial zero Poisson's ratio characteristic is achieved, and meanwhile the energy absorption capacity is achieved. The cell element is based on elastic deformation, has self-recovery capability and long cycle life, adopts modular design, is convenient to assemble, disassemble and maintain, and is suitable for application scenes of aerospace buffer devices, biomedical implants, precise instrument supporting structures and the like.

The invention discloses a self-resetting damper based on mechanical metamaterial axial pressure driving transverse cooperative instability. The damper is composed of metamaterial units arranged periodically, and each unit comprises inner left / right arc-shaped beams with opposite concave surfaces, outer left / right arc-shaped beams with opposite convex surfaces, inner / outer upper and lower fixing plates, a vertical supporting beam and left / right transverse connecting beams. The end parts of the inner and outer left / right arc-shaped beams are connected with inner / outer upper and lower fixing plates which are arranged in parallel; the middle of the vertical support beam is connected with the inner upper-lower fixing plate; the inner and outer arc-shaped beams are connected through left / right transverse connecting beams. The outer beam is bent inwards under shaft pressure, and the inner beam is driven to move inwards cooperatively to generate jumping instability. The multiple units are connected in series, and energy is consumed through continuous instability. The damper can be made of steel or a carbon fiber composite material, and the strength, rigidity and energy consumption characteristics can be customized by adjusting the geometric parameters of the arc-shaped beam and the topological configuration of the unit. In the deformation process, all components are kept in an elastic state, and the excellent self-resetting capacity is achieved.

The invention discloses a phase change flexible mechanical metamaterial with adjustable and controllable deformation. The phase change flexible mechanical metamaterial comprises a plurality of lattice units which are mainly composed of a series of basic driving units arranged in a set pattern and first configuration connecting pieces or second configuration connecting pieces, the basic driving units are bonded and fixed to the first configuration connecting pieces or the second configuration connecting pieces, and the first configuration connecting pieces are of L-shaped structures. The first configuration connecting piece is of a plate-shaped structure, the second configuration connecting piece is of a plate-shaped structure, each basic driving unit is provided with a fixed side and a deformation side, the fixed side is fixedly bonded with the first configuration connecting piece or the second configuration connecting piece, the deformation side is used for generating deformation, and each basic driving unit can be independently controlled. The deformation-controllable phase change flexible mechanical metamaterial can repeatedly and reversibly realize abundant and diversified controlled deformation, can keep deformation without power consumption, greatly expands the deformation form of limited liquid-gas phase change flexible driving in the prior art, and has a relatively great application prospect.

Methods and devices are provided for fabricating and employing patient immobilization devices during radiation treatment procedures. Immobilization devices are provided that include a thin conformal shell configured to conform to an anatomical region of a patient that is to be exposed to radiation during a radiation treatment procedure, with a rigid lattice structure extending outwardly, in an external, beam-facing direction, from the conformal shell. The rigid lattice structure confers structural rigidity to the device, and the thin cellular regions mitigate the impact of the device on a surface dose delivered to the patient or subject. The present mechanical-metamaterial-based immobilization devices incorporate structural features that confer advantageous mechanical properties and radiation transmissive properties when compared with conventional solid or mesh-based immobilization devices used in radiation therapy.

The invention discloses a negative Poisson's ratio tubular energy absorption structure based on bimodal compression-torsion coupling, and belongs to the technical field of mechanical metamaterial and structural engineering vibration reduction and impact resistance. The device comprises an outer shell, an upper inner circular ring, a lower inner circular ring, an upper end frame plate, a lower end frame plate and supporting rods. The upper end frame plate and the lower end frame plate are coaxially arranged up and down, and the outer shell is installed between the opposite end faces of the upper end frame plate and the lower end frame plate. The upper inner circular ring and the lower inner circular ring which are positioned in the outer-layer shell are coaxially arranged up and down, and an axial distance exists between the end surfaces of the upper inner circular ring and the lower inner circular ring; the upper inner circular ring is connected with the coaxially-arranged upper end frame plate through a first set of obliquely-arranged supporting rods, and the lower inner circular ring is connected with the coaxially-arranged lower end frame plate through a second set of obliquely-arranged supporting rods. The impact resistance and the energy absorption characteristic of the structure are remarkably improved by ingeniously fusing a heterogeneous bimodal mechanism of outer layer negative Poisson's ratio compression contraction torsion and inner layer inclined strut independent compression torsion.

The present disclosure relates to a mechanical metamaterial with a variable bistable state. The mechanical metamaterial comprises a plurality of metamaterial unit cells connected in sequence in a first direction. Each metamaterial unit cell comprises a connecting head, a variable part and a fixed part connected in sequence in the first direction. The variable part comprises a plurality of variable sheet groups, each variable sheet group comprising two variable sheets, each variable sheet having a top end connected to the connecting head and a bottom end connected to the fixed part, and the width of each variable sheet increasing from the top end to the bottom end. The two variable sheets of each variable sheet group are symmetric about the axis center of the connecting head. The fixed part has a cavity facing the connecting head, and when an axial load is applied to the top of the connecting head, the top end of the variable sheet is bent in the direction of the cavity under the action of the connecting head, and part of the variable sheet and part of the connecting head can be accommodated in the cavity at the top of the fixed part. The mechanical metamaterial of the present disclosure can maintain stable and large deformation and has good band gap regulation ability.

The invention provides a tensegrity inspired buffer mechanical metamaterial structure, which relates to the technical field of buffer materials and comprises an upper-layer buckling structure, an upper-layer connecting structure, a lower-layer connecting structure and a lower-layer buckling structure, the upper-layer buckling structure and the lower-layer buckling structure are correspondingly arranged in the vertical direction and cover the outer side of the upper-layer connecting structure and the outer side of the lower-layer connecting structure correspondingly. The upper-layer buckling structure and the upper-layer connecting structure are both circumferential array structures and respectively comprise buckling units and connecting units which are in one-to-one correspondence in number; each buckling unit comprises a supporting framework, a deformation main body, a supporting seat and a connecting interface; each connecting unit comprises a connecting part and a coupling part used for being matched with the buckling unit; the inner connecting bulge of the buckling unit and the coupling part of the connecting unit form embedded coupling connection; the upper-layer outer connecting protrusions of the upper-layer buckling structure and the corresponding outer connecting protrusions of the lower-layer buckling structure are directly and fixedly connected at the central plane of the metamaterial.

A method for fabricating a negative Poisson's ratio Miura origami-structured zirconia ceramic includes the following steps: Designing a unit cell structure using 3D modeling software; horizontally arranging the unit cells to obtain a single-layer, thicknessless Miura origami structure; mirroring, thickening, and merging the single-layer, thicknessless Miura origami structure to obtain a multi-layered Miura origami structure; importing the model into slicing software for slicing and then 3D printing to form a green body; placing the cleaned green body in a muffle furnace for degreasing and sintering; and obtaining the negative Poisson's ratio Miura origami-structured zirconia ceramic after sintering. By using 3D printing to achieve the stacked Miura origami structure and then sintering it, the mechanical metamaterial of origami is combined with ceramic materials. This not only enhances the toughness of ceramic materials through special structures but also solves the problem of traditional ceramic preparation methods being unable to fabricate complex structures. It features convenience, high precision, and customizability.

The application discloses an elastic wave stealth device of rib plate mechanical metamaterial with an active control function, which comprises a rib plate, a piezoelectric sheet and an active control circuit; the rib plate is made of uniform ABS material and is composed of a long strip-shaped reinforcing rib and a rectangular base plate; the piezoelectric sheet and the reinforcing rib are arranged on two surfaces of the rectangular base plate respectively; a circular through hole with a radius of 78 mm is formed in the center of the rib plate; the piezoelectric sheet is adhered to one side surface of the rib plate around the through hole; each piezoelectric sheet is connected with the active control circuit to form a mechanical metamaterial capable of being actively controlled; the length and the width of the rectangular base plate are at least 5 times greater than the thickness of the rectangular base plate; the height of the reinforcing rib is less than the thickness of the rectangular base plate; the piezoelectric sheet is a thin sheet with positive and negative poles and in a rectangular shape, is of a PZT-5H type and has an initial elastic modulus of 56 Gpa.

A kind of band gap real-time adjustable pneumatic drive type broadband vibration isolation metamaterial and its preparation method and application.The present application belongs to the field of mechanical metamaterials.The present application is to solve the technical problem of low efficiency and low reliability caused by the cumbersome band gap adjustment method of existing vibration isolation materials.The metamaterial of the present application includes several series of basic units, the basic unit is a one-piece structure, the top and bottom are both cylindrical, the middle part is a truncated cone, the diameters of the top and bottom cylindrical correspond to the diameters of the top and bottom surfaces of the truncated cone, the basic unit has a cavity inside, the shape is the same as the overall shape of the middle part and the bottom, and the bottom cylindrical and the top cylindrical have first and second through holes respectively, which are in communication with the cavity.The present application realizes the broadband real-time adjustment of the band gap through structural design and pneumatic drive, and has the advantages of simple structure, easy processing and strong environmental adaptability, and can be used normally in conventional and various extreme environments.

The invention relates to an isotropic energy-absorbing tensioning cell element structure based on a triangle, which belongs to the field of mechanical metamaterials and comprises three parts, namely a corner component, an edge component and a middle tensioning component, under the action of the middle tensioning assembly, when the structure is not subjected to an external load, the structure is subjected to interaction of internal stress, and the balance is achieved in a self-stabilization state; under the state of being subjected to an external load, the structure can generate self-adaptive deformation; and the external load is removed again, and the structure can recover to the initial state. The isotropic energy-absorbing tensioning cell element structure based on the triangle has the advantages of self-adaptability, self-recovery, self-stability, isotropy, energy absorption and the like, the tensioning overall structure and the mechanical metamaterial structure are combined, the types of existing mechanical metamaterial cell element structures are enriched, and the mechanical metamaterial cell element structure is more compact. And a brand new direction is opened up for the design, analysis and application of the tensioning mechanical metamaterial structure.

The application discloses a structure for imparting strain hardening performance to metamaterials and a design method thereof. In the structure for imparting strain hardening performance to metamaterials, unit bodies are periodically arranged in a shared edge mode to obtain an interlaced structure between layers, the structure is deformed from the upper and lower end surface layers, the yield strength of the structure nodes is higher than the yield strength of the deformed layers, the structure is deformed layer by layer, meanwhile, the structure has multiple degrees of freedom of deformation, high tolerance to local strain, high energy absorption, and the generation and expansion of cracks caused by stress concentration are delayed. The mechanical metamaterial prepared by using the photocuring 3D printing technology exhibits the strain hardening characteristics in the compression test, has high specific peak strength (9.6 MPa·cm 3 ·g ‑1 ), specific yield strength (4.3 MPa·cm 3 ·g ‑1 ), specific stiffness (1.26 MPa) and large plasticity (28.2%), and is superior to the octahedral truss lattice structure commonly used in the truss lattice structure under the condition that the materials are the same, the rod diameters and the rod lengths are the same (the rod length-diameter ratio is the same).

The application provides a three-dimensional gradient negative Poisson's ratio honeycomb skeleton structure and a preparation method and application thereof, and relates to the technical field of mechanical metamaterials; the external configuration of the three-dimensional gradient negative Poisson's ratio honeycomb skeleton structure is a circular truncated cone tube structure; the circular truncated cone tube structure comprises a plurality of curved surface concave hexagonal cells arranged around a central axis of the circular truncated cone tube structure and in a gradient along the circular truncated cone generatrix direction; the structure gradient can be first realized by relying on inherent characteristics of the inclined wall surface of the circular truncated cone tube structure, and further controlled by adjusting internal cell parameters; and the skeleton structure can be prepared by a 3D printing process. The three-dimensional gradient negative Poisson's ratio honeycomb skeleton structure has the characteristics of light self-weight, linear deformability, synergistic effects of structure gradient effects and negative Poisson's ratio effects, and deformation characteristics of flexible linear expansion under external load, and can be used in the fields of protective engineering, artificial intelligence, wearable devices, medical devices, artificial prostheses and the like.

The invention relates to an isotropic energy-absorbing tension meta-material structure, and belongs to the field of mechanical meta-materials, the isotropic energy-absorbing tension meta-material structure comprises an isotropic energy-absorbing tension cell structure based on a triangle and an I-shaped connecting piece, and the tension cell structure comprises a corner assembly, an edge assembly and a middle tension assembly; under the action of the middle tensioning assembly, when the structure is not subjected to an external load, the structure is subjected to interaction of internal stress, and the balance is achieved in a self-stabilization state; under the state of being subjected to an external load, the structure can generate self-adaptive deformation; and the external load is removed again, and the structure can recover to the initial state. The isotropic energy-absorbing tension metamaterial structure has the advantages of self-adaptability, isotropy, negative Poisson's ratio and the like, a tension integral structure and a mechanical metamaterial structure are combined, and the types of existing mechanical metamaterial cell element structures are enriched; and a brand new direction is opened up for the design, analysis and application of the tensioning mechanical metamaterial structure.

This application discloses a multi-attribute tunable three-dimensional mechanical metamaterial structure and its design method, relating to the field of mechanical metamaterials. This application provides a novel unit cell structure, and the properties of this three-dimensional mechanical metamaterial structure are related to the characteristic parameters of the unit cell structure. Therefore, by adjusting the characteristic parameters of the unit cell structure, the Poisson's ratio, compressibility coefficient, and coefficient of thermal expansion of the three-dimensional mechanical metamaterial structure can be adjusted. During the design process, through a combination of finite element analysis and theoretical analysis, and by simple calculation analysis and optimized selection of characteristic parameters, the three properties of the three-dimensional mechanical metamaterial structure can be individually controlled. This allows the three-dimensional mechanical metamaterial structure to possess the desired target properties, filling a gap in the industry and possessing significant industrial practical value. It can meet the actual needs of new advanced equipment with multiple functions and applications.

The application discloses a mechanical metamaterial structure with anisotropic Poisson's ratio, and belongs to the technical field of mechanical metamaterials. The structure is realized through the modular connection of a plurality of zero-Poisson's ratio tensile units and fast connection buckle components. The zero-Poisson's ratio tensile unit comprises an upper bottom plate, a lower bottom plate, an elastomer, a horned nail, a flexible hinge connecting block, a thick flexible hinge and a thin flexible hinge. The synergistic effect of these components enables the zero-Poisson's ratio characteristic, self-adaptability, self-stability and self-recovery in the axial direction. Through the cross arrangement and connection, the overall structure maintains the axial zero-Poisson's ratio and realizes the lateral negative Poisson's ratio effect in the macroscopic aspect, forms the significant Poisson's ratio anisotropy, and meanwhile, the overall structure also has good self-recovery in the lateral direction. The modular structure is convenient for local maintenance and performance regulation and control, and can adapt to the complex load environment in the fields of aerospace and flexible robots.

The application discloses a kind of metamaterial cell structures based on four-pole tension integral, belong to mechanical metamaterial field.The structure includes X-shaped main support frame, folding assembly and elastic component.X-shaped main support frame includes two rigid main support rod members arranged in cross, folding assembly is connected to X-shaped main support frame upper side and lower side, and elastic component is arranged on the left and right sides of X-shaped main support frame.Under the action of external force, two rigid main support rod members can rotate relatively, upper folding assembly and lower folding assembly are folded or unfolded in sequence, elastic component occurs expansion and contraction deformation and applies tension restoring force, so that the structure realizes cooperative deformation and recoverable motion.The application combines tension integral structure with mechanical metamaterial cell design, and can be used for recoverable deformation structure, buffer energy-absorbing structure and tension integral metamaterial cell structure design.

The invention discloses a broadband high-damping self-resetting damper based on a mechanical metamaterial and a viscous composite cavity. The damper comprises a mechanical metamaterial, a cylindrical cylinder body with a rail, a damping medium, a sealing sleeve and a piston rod, wherein the mechanical metamaterial is formed by connecting a plurality of shell structures in series and is provided with an upper baffle and a lower baffle. A circumferential groove of the shell structure is connected with a sliding rail in the cylinder body, the sealing sleeve is arranged at a barrel opening of the cylinder body, the piston rod is connected with the upper baffle made of the mechanical metamaterial through the sealing sleeve, and the lower baffle is connected with the cylinder bottom. A sealing cavity formed by the cylinder body and the sealing sleeve is divided into a plurality of chambers by the mechanical metamaterial, each chamber is filled with a damping medium, and flow guide holes are formed in the surfaces of the baffle and the shell structure. When a low-frequency load acts, energy is consumed mainly by continuous instability of the shell structure in the metamaterial; when a high-frequency load acts, the continuous instability energy consumption of the metamaterial middle shell structure and the high-speed flow energy consumption of the damping medium act synergistically. In the deformation process, all components are kept in an elastic state, and an ideal self-resetting function is achieved.

This invention discloses a variable-capacity vapor chamber with a mechanical metamaterial composite support structure and its preparation method. The variable-capacity vapor chamber includes an upper shell and a lower shell arranged opposite each other, liquid-absorbing cores fixed to the inner sides of the upper and lower shells respectively, multiple metastructures sandwiched between the two liquid-absorbing cores, and a circumferentially arranged flexible sealing structure. The metastructures are formed by the flexible liquid-absorbing cores circumferentially wrapping around the outer surface of the mechanical metamaterial. The mechanical metamaterials serve as a load-bearing skeleton, and the flexible liquid-absorbing cores serve as capillary transport channels for the return of the working fluid. The metastructures are used to undergo reversible deformation in the thickness direction to achieve changes in cavity volume while maintaining capillary transport continuity during deformation. Simultaneously, vibration attenuation and impact energy absorption are achieved through the nonlinear mechanical response of the mechanical metamaterials. This invention integrates heat transfer, variable capacity, vibration isolation, and energy absorption functions into one unit, making it suitable for applications such as aerospace equipment and high-power electronic devices that have stringent requirements for both thermal management and vibration reduction.

The invention belongs to the technical field of mechanical metamaterials, and particularly relates to a two-dimensional high-rigidity auxetic material with high anisotropy. The microstructure cell element is composed of a torsion extension unit and supporting rods, one end of each supporting rod is connected with each fulcrum of the torsion extension unit, and the supporting rods are horizontally and vertically arranged. The two-dimensional auxetic material takes microstructure cell elements as basic units, and is obtained by sequentially carrying out mirror image splicing on the microstructure cell elements in the horizontal direction and the vertical direction. The cell microstructure of the auxetic material is formed by splicing simple rod pieces. Through microstructure cell element structure optimization, while the negative Poisson's ratio effect is kept unchanged or slightly enhanced, the structural rigidity is enhanced, and the deformation resistance is improved.

The application discloses a kind of cross substrate topological dot matrix metamaterial structures, it is related to bearing and energy-absorbing material technical field, to solve the technical defects that existing mechanical metamaterial high stress level and stress stability is difficult to take into account, deformation mode is uncontrollable.The structure is prepared by "cross plate rotation forming-vertical direction enhancement-center cutting" unit cell, then the main body of metamaterial is formed by periodic array;Using the synergistic cooperation of bending dominant structure and tensile dominant structure, a new energy-absorbing mechanism is formed, which realizes the characteristics of no initial peak stress, high stress level and uniform performance in all directions without additional space occupation, and the deformation energy-absorbing mode is stable and controllable, avoiding the random buckling and overturning of traditional structure.The application can be widely used in aerospace, transportation and other fields, and provides an ideal material solution for high-demand bearing and energy-absorbing scenarios.

The invention discloses a mechanical metamaterial structure with an anisotropic Poisson ratio, and belongs to the technical field of mechanical metamaterials. The structure is achieved through modular connection of the multiple zero-Poisson-ratio tensioning cell elements and the rapid connection buckle components. The zero-Poisson-ratio tensioning cell comprises an upper bottom plate, a lower bottom plate, an elastic body, a claw nail, a flexible hinge connecting block, a thick flexible hinge and a thin flexible hinge, and the zero-Poisson-ratio tensioning cell has the zero-Poisson-ratio characteristic, self-adaptability, self-stability and self-recovery performance in the axial direction by means of the synergistic effect of the components. Through cross-shaped arrangement and connection, the overall structure keeps the axial zero Poisson's ratio macroscopically, the transverse negative Poisson's ratio effect is achieved, remarkable Poisson's ratio anisotropy is formed, and meanwhile the overall structure has good self-recovery performance in the transverse direction. The modular structure facilitates local maintenance and performance regulation and control, and can adapt to complex load environments in the fields of aerospace, flexible robots and the like.

The invention discloses a non-uniform mixed lattice structure and a yield anisotropy regulation and control method thereof, and belongs to the technical field of mechanical metamaterials. The non-uniform mixed lattice structure comprises a cubic unit serving as a basic framework, a center node of the cubic unit is shifted in the direction of a space diagonal line to form an adjustable non-uniform mixed framework, and the framework is filled with BCC truss lattices and SC truss lattices. The regulation and control method comprises the following steps: step 1, defining basic parameters; step 2, non-uniform unit segmentation; step 3, lattice filling and parameter optimization; step 4, performing elastic isotropy verification; and 5, carrying out yield isotropic optimization. Through the innovative design of'offset nodes + mixed lattices', the problem of anisotropy regulation and control is solved while the high mechanical property is kept. The composite material can be widely applied to light-weight structures in the aerospace field, implant supports in the biomedicine field, collision buffering structures in the automobile industry and other scenes with high requirements for mechanical properties and reliability.

The invention provides a preparation method of a three-dimensional reentrant cylindrical lattice metamaterial, and relates to the field of mechanical metamaterials. Comprising the following steps: converting a three-dimensional reentrant cubic unit cell into a three-dimensional reentrant fan-shaped unit cell by adopting a topological isomorphic mapping mode; the three-dimensional reentrant fan-shaped unit cells are arrayed at equal angles in the circumferential direction to form a closed single-layer three-dimensional reentrant cylindrical lattice; and assembling a plurality of single-layer three-dimensional reentrant cylindrical lattices along the Z-axis direction to obtain the three-dimensional reentrant cylindrical lattice metamaterial. According to the method, the technical limitation that a traditional reentrant unit cell is limited to a cubic configuration and the overall form can only achieve a cuboid or a cube is broken through, the topological structure of the three-dimensional reentrant fan-shaped unit cell is accurately constructed, unit body circumferential arrangement and a multi-layer axial array are optimized, and the three-dimensional reentrant fan-shaped unit cell is obtained. The organic fusion of the cylindrical spatial form and the reentrant mechanical property is successfully realized, and a standardized and controllable technical path is provided for the preparation of the special-shaped high-performance lattice metamaterial.

A construction system for mechanical metamaterials based on discrete assembly of a finite set of modular, mass-produced parts. A modular construction scheme enables a range of mechanical metamaterial properties to be achieved, including rigid, compliant, auxetic and chiral, all of which are assembled with a consistent process across part types, thereby expanding the functionality and accessibility of this approach. The incremental nature of discrete assembly enables mechanical metamaterials to be produced efficiently and at low cost, beyond the scale of the 3D printer. Additionally, a lattice structure constructed of two or more rigid, compliant, auxetic and chiral part types enable the creation of heterogenous macroscopic metamaterial structures.

The application discloses a kind of flexible mechanics metamaterial and preparation method and application thereof, belong to the technical field of metamaterial, the present application is combined with negative stiffness theory to carry out crystal structure beam design and insert thin-walled support structure in inside, the geometric model of the metamaterial constructed has excellent geometric nonlinear characteristics, is manufactured using silicone mold method, can guarantee that the metamaterial is in or close to low stiffness state under specific load condition, to realize the purpose of low-frequency vibration isolation. Compared with the traditional parallel vibration isolator through positive and negative stiffness unit, the structure is more simple, compact, more easily realizes low-frequency vibration isolation under specific load conditions in limited space by the method designed by the present application.

The invention provides a double-section gradient compression torsion mechanical metamaterial structure, which relates to the technical field of metamaterial structures and comprises an upper-layer cross beam structure, a lower-layer cross beam structure, four middle-layer square connecting beams, four upper-layer inclined connecting beams and four lower-layer inclined connecting beams, the lower-layer cross beam structure and the upper-layer cross beam structure are parallel to each other, have the same angle and are both formed by crossing two beams which are perpendicular to each other and have the same length at the geometric center, and four end points serve as connecting nodes; the four middle-layer square connecting beams are connected end to end to form a closed square frame body which is positioned between the upper-layer cross beam structure and the lower-layer cross beam structure; the four end points of the lower-layer cross beam structure are connected with the four corner points of the middle-layer square connecting beam through the lower-layer inclined connecting beams respectively, and the four corner points of the middle-layer square connecting beam are connected with the end points of the upper-layer cross beam structure through the upper-layer inclined connecting beams; and the middle-layer square connecting beam is provided with a rotation angle around a central shaft relative to the upper-layer cross beam structure and the lower-layer cross beam structure.

This invention discloses an intelligent buffer device for a deep-sea lander based on mechanical metamaterials, belonging to the field of deep-sea exploration equipment technology. The device includes a triangular stable support frame composed of a main support leg, a secondary support leg, and a lateral self-resetting energy-absorbing module. The main support leg houses a negative Poisson's ratio adjustable damping shock absorber, which adjusts vertical damping in real time by driving a negative Poisson's ratio piston to change its radial dimension. The lateral self-resetting energy-absorbing module is filled with a three-period minimal curved surface lattice structure made of shape memory alloy, which absorbs energy through TPMS compression deformation and efficiently attenuates lateral impacts caused by deep-sea currents, and can be reset by introducing seawater for heating. An active attitude adjustment module is also installed on the platform, driven by a motor-driven reverse thrust propeller, used for anti-crosscurrent attitude stabilization and deceleration before bottoming during descent. This invention achieves omnidirectional intelligent buffering throughout the deep-sea landing process through the triple synergy of attitude adjustment, active vertical damping control, and efficient lateral energy absorption, significantly improving landing stability, safety, and equipment reusability.