108 results about "Mechanical metamaterial" patented technology

The invention relates to a multistable mechanical metamaterial structure with a tension characteristic, which belongs to the field of mechanical metamaterials and mainly comprises a multistable mechanical metamaterial cell structure, and the multistable mechanical metamaterial cell structure comprises a tension integral structure component, a degree-of-freedom constraint component and a connecting component. Under the action of a tensioning integral structure, when the structure is not subjected to external load, the structure is subjected to interaction of internal stress, and the balance is achieved in a self-stabilization state; according to the multistable mechanical metamaterial cell element structure with the tension characteristic, the structure of the position where each side of the square outline is located has two steady-state configurations, and the cell element structures are connected through a rectangular array to form the multistable mechanical metamaterial structure with the tension characteristic. The tensegrity structure and the mechanical metamaterial structure are combined, the types of existing mechanical metamaterial cell element structures are enriched, and a brand new direction is opened up for design, analysis and application of the tensegrity mechanical metamaterial structure.

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.

Mechanical metamaterial passive wireless sensors and methods of use thereof are disclosed. An example sensor includes a flexible substrate having multiple extending arms; at least one temperature responsive actuator coupled to the substrate; and an antenna embedded within the substrate and extending along at least a portion of the multiple extending arms, the antenna configured to deform with the substrate. The substrate may be configured to be activated upon exposure of the at least one temperature responsive actuator to an environmental temperature that exceeds a threshold, and further configured to transform into at least one three-dimensional configuration in response to a duration of immersion in a liquid following the activation, the three-dimensional configuration causing a detectable change in electromagnetic signal characteristics of the antenna.

The invention discloses a design method of a mechanical metamaterial based on 3-order magic cube digital coding, and the method comprises the following steps: S1, simplifying and calibrating orthotropic unit cells as magic cube blocks, and formulating a sequence rule of the arrangement of the magic cube blocks according to the spatial arrangement characteristics of the orthotropic unit cells; s2, according to the spatial combination and arrangement of the magic cube blocks, constructing a 3-order magic cube regulation and control model with programmable control characteristics; and S3, through performance characterization and judgment, carrying out performance inspection on the 3-order magic cube regulation and control model, carrying out functional structure directional design or optimization design through constraint conditions to obtain a target structure, and constructing the performance-programmable mechanical metamaterial. According to the invention, through digital coding and the magic cube frame, the arrangement of the magic cube blocks is adjusted as required, a target structure with specific performance is designed, and the performance of the mechanical metamaterial is controlled.

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 application belongs to the technical field of mechanical metamaterials, and particularly relates to a self-similar layered negative Poisson's ratio cell and a honeycomb structure thereof. The self-similar layered negative Poisson's ratio structure replaces the corner points of the traditional structure with similar star-shaped structures on the basis of the traditional star-shaped structure. When the structure is subjected to low-speed impact, the adjacent cells will first form self-similar star-shaped structures due to the unique configuration, and only after all the self-similar star-shaped structures are formed, the cell walls of the cells will begin to contact each other and deform, so that the self-similar layered negative Poisson's ratio structure can have more superior energy absorption capacity and higher platform stress while maintaining the negative Poisson's ratio effect.

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.

The present invention discloses a bistable vibration-absorbing unit, a bistable mechanical metamaterial structure, and a method for preparing the same. The bistable vibration-absorbing unit is characterized by comprising a track frame, a vibrator, and an elastic mechanism; the track frame is provided with opposing tracks on both sides, and the track profile is a parabola; the vibrator is located between the tracks on both sides of the track frame; the first end of the elastic mechanism is connected to the side of the vibrator, and the second end of the elastic mechanism is slidably connected to the track on the corresponding side; the elastic mechanism has the freedom to compress or extend, and the elastic mechanism has a travel along the track. The present invention is applicable to the fields of vibration and noise control and nonlinear metamaterial structures, and can be applied to impact energy-absorbing structures. It has higher strength and stability, and achieves low-frequency, broadband, and efficient vibration suppression and impact attenuation effects with low additional mass.

The invention discloses a mechanical metamaterial with double negative equivalent parameters and a preparation method thereof, and relates to the technical field of mechanical metamaterial structures. The invention aims to solve the problems of insufficient controllability, designability, multi-scene adaptability and the like of the existing negative Poisson's ratio and negative stiffness metamaterial. The device comprises a plurality of unit cell layers which are sequentially arranged from bottom to top, each unit cell layer comprises a plurality of unit cells which are evenly distributed in a matrix shape, every two adjacent unit cells are fixedly connected through a connecting block, each unit cell comprises two cell elements which are oppositely and fixedly connected in the vertical direction, and each cell element comprises a polygonal frame, a fixing block and a plurality of connecting rods; the fixing block is arranged over the polygonal frame, the connecting rods are evenly distributed between the polygonal frame and the fixing block, the inner side of the upper end of each connecting rod is fixedly connected with the fixing block, and the outer side of the lower end of each connecting rod is fixedly connected with the middle of one frame of the polygonal frame. The method is used for mechanical metamaterial design.

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.

A mechanical metamaterial comprising a chiral structure and a reentrant structure repeatedly layered to form a 3D structure with improved compressive response is disclosed. The 3D structure of the present invention is a metamaterial which can be perfectly and easily produced by a photocuring 3D printing process without any internal support. The introduction of modified carbon nanotubes into the printing composite material improves the compression resistance and impact resistance of the products and increases the service life through the special periodic structure. The application of 3D printing technology in fabricating mechanical metamaterials can break through the processing limitation of traditional processing technology or microelectronics manufacturing technology to make three-dimensional periodic structures.

The invention belongs to the technical field of bridge wind tunnel test devices, and provides a wind tunnel test device for simulating nonlinear vibration of a bridge structure, which comprises a rigid model, a rigid rod, a rigid arc suspension arm, a linear extension spring, a nonlinear elastic element and a light high-strength string. The nonlinear elastic element can adopt a cable structure, a membrane structure, a nonlinear extension spring, a mechanical metamaterial or a superstructure. Various target nonlinear rigidity modes can be realized by designing the nonlinear rigidity characteristics and the arrangement mode of the nonlinear elastic elements and the combination mode of the nonlinear elastic elements and the linear extension springs, so that a large-amplitude vertical torsion coupling flutter test under the nonlinear rigidity of a bridge structure can be carried out. In the large-amplitude vibration process of the model, the central lifting point of the nonlinear elastic element and the linear extension spring can always keep vertical displacement and deformation, and the device can ensure stable rigidity, damping, mass and mass moment characteristics.

A multi-tooth mechanical metamaterial with adjustable stiffness, and its preparation method and application. The present invention belongs to the field of mechanical metamaterials. In order to overcome the shortcomings of existing fixed stiffness structures. The metamaterial unit cell of the present invention is assembled from an inner and outer barrel. The variable stiffness shell is the main load-bearing structure of the inner and outer barrels. In order to facilitate the assembly between the unit cells, a first limiting ring, a second limiting ring and a limiting block are designed on the inner and outer barrels respectively. The function of the first limiting ring and the second limiting ring is to "clamp" when adjacent unit cells are connected to prevent different unit cells from detaching. The limiting block plays the role of transferring the load between adjacent unit cells. By making the inner and outer barrels of the unit cell rotate relative to each other, the fan-shaped teeth of different sizes are brought into contact with each other, thereby realizing the stiffness adjustment of the metamaterial. The multi-tooth mechanical metamaterial proposed by the present invention can be used in the joint transmission of flexible robots, adaptive adjustment of mechanical arms and the manufacture of aircraft landing gear.

The present invention belongs to the field of mechanical metamaterials, and specifically relates to a lattice metamaterial that can achieve dual negative properties of negative thermal expansion and negative Poisson's ratio. The present invention automatically achieves thermal contraction and cold expansion of the overall geometric dimensions of the unit cell, that is, an equivalent negative thermal expansion coefficient, through the non-uniform stretching / contraction deformation of rods made of different materials when the ambient temperature changes. The present invention not only has a negative thermal expansion coefficient, but also has the mechanical properties of a special material with a negative Poisson's ratio of tensile expansion. The present invention has the geometric characteristics of a lattice, and thus has the mechanical properties of a light weight, high specific stiffness, and excellent strength. The actual material negative thermal expansion coefficient values ​​that can be obtained in the two main directions of the material of the present invention are ‑71.9ppm / ℃ and ‑11.4ppm / ℃ respectively; the actual material Poisson's ratio values ​​that can be obtained are ‑0.18 and ‑1.6. The present invention does not have a size effect, that is, the geometric dimensions of the metamaterial can still ensure the designed negative thermal expansion coefficient and negative Poisson's characteristics after being enlarged or reduced in the same proportion.

The application belongs to the technical field of electromagnetic protection, and relates to an electromagnetic protection device based on nonlinear attenuation of mechanical waves, which comprises a piezoelectric substrate, a signal input component, a nonlinear attenuation component and a signal output component which are sequentially and spaced apart on the piezoelectric substrate; the nonlinear attenuation component comprises an energy-absorbing structure, a deformation structure and a rigid connection structure; the energy-absorbing structure is made of an energy-absorbing material and is spaced apart above the piezoelectric substrate; the deformation structure is made of mechanical metamaterial and is connected to the energy-absorbing structure and the piezoelectric substrate at two ends; one end of the rigid connection structure is connected to the energy-absorbing structure, and the other end is spaced apart from or abuts against the piezoelectric substrate; the signal input component converts electromagnetic wave signals into mechanical waves; the nonlinear attenuation component deforms under the propagation of the mechanical waves, and the deformation amount is proportional to the intensity of the mechanical waves; and the signal output component converts the mechanical waves into electromagnetic wave signals and outputs the electromagnetic wave signals. The application can realize electromagnetic protection based on nonlinear attenuation of mechanical waves.

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.

The application discloses an elongated component instability simulation calculation system based on double-constraint mechanical metamaterial beam electrically-driven post-buckling, which comprises an electric driving device, a double-constraint mechanical metamaterial beam structure and a deformation monitoring system. The electric driving device is composed of a programmable direct current power supply, one mobile comb electrode, two fixed comb electrodes and three wires. The double-constraint metamaterial beam structure is connected with the mobile electrode, and the mechanical metamaterial beam generates post-buckling behavior under the action of the electric driving device. The deformation monitoring system comprises a planar rectangular coordinate system grid plate and a high-speed camera, which are used for monitoring and recording the post-buckling deformation of the mechanical metamaterial beam under a certain electric potential difference. The system can quantitatively predict the actual phenomenon of buckling instability of the elongated component of a structure in the field of civil engineering, realizes the solution of differential equations through post-buckling mechanical behavior, is not limited by computer technology, and is a more efficient, convenient and intuitive differential equation solution system.

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.