23 results about "Hyper elastic" patented technology

The application discloses a simulation analysis method for an aircraft landing gear tire under heavy landing impact load, and relates to the technical field of aeronautical engineering and computational mechanics. First, in the tread and sidewall rubber area, the micro-heterogeneity of the rubber material in the tire is equivalent to the super-elastic mechanical behavior of the macro-continuous medium based on the homogenization theory. This process avoids the extremely dense mesh and complex constitutive relationship required for depicting the micro-features such as filler distribution and interface effect in the traditional model. Then, the rebar element representing force transmission under impact load is created in the pre-constructed rubber matrix grid, and the rebar element is coupled with the rubber matrix. The simplified coupled model can accurately capture the anisotropic stiffness, main force transmission path and reinforcement effect of the cord-rubber composite structure, so as to finally stably and accurately simulate the transient impact process of the tire under heavy landing impact load, which includes the triple nonlinearity of geometry, material and contact.

The utility model relates to the technical field of sealing strips, in particular to a bag sealing strip with a hyperelastic anti-deformation function, which comprises a sealing component, a spring arranged in the sealing component and a buckle fixed at the bottom end of the sealing component, the sealing component comprises a sealing strip and an internal component of the sealing strip, and a partition plate is integrally fixed in the middle of the sealing strip. The partition plate divides the sealing strip into an upper part and a bottom part, two groups of positioning petal structures are fixed in the upper part and on the inner side walls of the two sides of the sealing strip, the spring is fixed in the positioning petals, the sealing petals are fixed at the top ends of the positioning petals, the bottom petals are fixed on the opposite sides, a cavity is formed among the sealing petals, the bottom petals and the inner side walls of the sealing strip, and the two groups of structures are matched and fixed. By means of the structure strength of the cavity in the top end, the buffering and supporting functions can be achieved, the anti-deformation function can be achieved, by means of the specific materials of the spring and the sealing strip, after being stressed, the spring and the sealing strip can rapidly deform and restore to the original shape, and the use requirement is met.

The application relates to a super-elasticity film grabber and a grabbing method, which comprise a super-elasticity film, a fixing component, a sealing plug, a gas guide pipe and a gas conveying pump; the fixing component is installed on a mechanical arm or a translation table; the gas guide pipe is a hollow circular pipe, and two ends of the pipe are respectively sealedly connected with the super-elasticity film and the gas conveying pump; the super-elasticity film is a spherical latex material film with an air inlet and outlet hole, and is sealedly connected with the fixing component and the gas guide pipe through the sealing plug; when the gas conveying pump conveys gas, the tension of the super-elasticity film and the gas pressure difference jointly act on the super-elasticity film to make the super-elasticity film expand and contract, so that the enveloping grabbing function of the super-elasticity film is realized. The super-elasticity film is used as an actuator to contact a target object and realize the grabbing function, and the application has the advantages of simple structure, easy manufacturing, convenient replacement and maintenance of parts and the like; based on the use method of the flexible grabber, the application can better adapt to the shape of the target object, realize the enveloping grabbing of target objects with different shapes, and does not need to continuously supply energy.

The present application relates to the field of shoe sole design, and specifically relates to a lattice structure rod diameter reverse design method, comprising the following sequentially executed steps: S1: constructing a unit cell structure; S2: defining parameters: connecting rod diameter d1, main rod diameter d2, fiber rod diameter d3, unit cell structure side length L and shape coefficient alpha; S3: generating a test structure; S4: obtaining the super-elasticity data and viscoelasticity data of the test structure, and establishing a finite element analysis model of the test structure; S5: setting each parameter, simulating and analyzing the test structure under each combination, obtaining the mechanical performance indicators of each test structure, and constructing a mechanical performance indicator database using the obtained mechanical performance indicators; S6: determining a unique rod diameter combination; S7: generating a lattice structure for filling a shoe sole according to the obtained rod diameter combination; the design method can quickly realize the reverse design of the rod diameter parameters in the lattice lattice structure, quickly iteratively obtain the rod diameter combination parameters under the target mechanical performance, and save design costs.

The invention provides a surveying and mapping method for a critical shear stress-temperature phase diagram of a tubular NiTi shape memory alloy, which comprises the following steps: heating a NiTi thin tube to a temperature above an austenite phase change end temperature Af to realize complete austenitizing, and keeping constant temperature under a plurality of temperature gradients to enable the NiTi thin tube to be in a hyperelastic state; under each constant temperature condition, carrying out a torsion test on the NiTi thin tube, and loading the NiTi thin tube to a predetermined unified maximum shear strain at each temperature to obtain a corresponding hyperelastic shear stress-shear strain curve at each temperature; reversely determining martensite start, martensite end, austenite start and austenite end critical shear stress at each temperature based on the geometrical characteristics and differential characteristics of each shear stress-shear strain curve; linear fitting is conducted on the four critical shear stresses corresponding to all the temperatures and the test temperature, the linear relation between the critical phase change shear stress of the NiTi thin tube and the environment temperature is constructed, and a critical shear stress-temperature phase diagram is generated.

The application discloses a numerical simulation method of a viscoelastic nonlinear dielectric elastomer constitutive model, constructs a free energy function of a dielectric elastomer considering a strain hardening effect; obtains a super-elastic constitutive model of the dielectric elastomer according to the free energy function of the dielectric elastomer; based on the obtained super-elastic constitutive model, introduces viscoelasticity of the dielectric elastomer material, and constructs a visco-hyper-elastic constitutive model of the dielectric elastomer; based on the constructed visco-hyper-elastic constitutive model, finite element simulation is carried out on a driver or a sensor structure with the dielectric elastomer as the material to carry out numerical simulation, and electromechanical stability and dynamic response of the dielectric elastomer structure are obtained, thereby laying a theoretical foundation for structure design of the dielectric elastomer. The application provides a new method for accurately calculating critical instability voltage of a complex dielectric elastomer structure, and also provides a possibility for accurately simulating dynamic behaviors of the dielectric elastomer.

The application discloses a phase transition super-elastic material topology optimization method based on a nonlinear constitutive model and belongs to the technical field of intelligent material structure design and multi-physical field optimization. The method comprises the following steps: establishing a super-elastic constitutive model containing a martensitic volume fraction to describe the coupling relationship between material phase transition behavior and mechanical properties; constructing a topology optimization model with the minimum structural flexibility as an objective and the volume fraction and a balance equation as constraints; adopting an additional super-elastic technology of dynamic reconstruction to solve the numerical instability problem in the optimization process; performing sensitivity analysis through an adjoint vector method; and obtaining an optimal topology configuration through iterative solution by using an optimal criteria method. The application can efficiently and stably realize the structure optimization of the phase transition super-elastic material, significantly improves the calculation efficiency and numerical stability of the optimization process, and is suitable for the structure design of intelligent materials such as shape memory alloys in the fields of aerospace, medical devices and the like.

The invention provides a material dynamic mechanical behavior simulation method and system based on LS-DYNA, and relates to the technical field of material simulation analysis methods. The method comprises the following steps: compiling a viscous-hyperelastic constitutive mathematical model into a UMAT subprogram, and embedding the UMAT subprogram into a solver of LS-DYNA software; the method comprises the following steps: carrying out finite element mesh generation on a geometric simulation model of a high polymer material sample, and generating a k file according to the characteristics of a high polymer material, keywords of a defined UMAT subprogram and parameter assignment of a viscous-hyperelastic constitutive mathematical model; and calling a solver of the LS-DYNA software according to the keyword of the UMAT subprogram, and calculating a k file to obtain a simulation result. According to the method, the dynamic mechanical response of the high polymer material can be predicted with high precision, the simulation precision of LS-DYNA software is improved, and the method is widely applicable to dynamic response simulation of materials such as rubber, a polyurea coating and a polyether polyurethane solid propellant in an impact environment.

The invention discloses a hyperelastic constitutive calculation method compatible with three-dimensional and shell elements, which comprises the following steps: establishing a unified theoretical framework of an elastic constitutive as a basis by strictly deducing a unified solution process of the hyperelastic constitutive, and representing stress and a consistent tangent stiffness matrix as a deformation gradient; a user only needs to provide a small number of expressions or parameters such as first two-order derivatives of a strain energy function about an invariant or a main tensile value, a unit dimension, a stress objective rate type and the like, and outputs stress and consistent tangent stiffness, so that the user input is minimized, and the user experience is improved. The successful implementation of the hyperelastic constitutive structure with different unit types, different stress objective rates and different strain energy forms under a unified solution system in a finite element is realized.

This invention discloses a parameter design method for a water-filled bag dike product, comprising: obtaining the target water-retaining height and water-filled bag parameters; determining the finite element analysis unit type based on the water-filled bag parameters; simulating the stress characteristics of the water-filled bag under water-retaining conditions using a hyperelastic constitutive model based on the finite element analysis unit; performing anti-overturning stability analysis and anti-sliding stability analysis on the water-retaining section of the water-filled bag dike based on the stress characteristics to obtain a comprehensive evaluation; determining the structural parameters of the design section based on the comprehensive evaluation and the target water-retaining height; performing layered discrete topology optimization on the reinforcement layers based on the structural parameters and deformation patterns; and optimizing the amount of reinforcement material according to the reinforcement connection method to obtain the parameter design results of the water-filled bag dike product. This method utilizes finite element analysis, transverse reinforcement, and gradient reinforcement spacing design to control the deformation within the required range and reduce the amount of reinforcement material, balancing deformation control effectiveness with production costs.

The utility model relates to a self-resetting rotary friction type damper, and belongs to the field of civil engineering structure damping. Axial displacement is converted into rotating motion of the rotor column through the ball screw mechanism, and friction energy consumption is achieved through a rotating friction pair of the rotor column and the fixed friction plate. And meanwhile, the annularly arranged SMA tows are subjected to tensile deformation when the screw rod displaces, secondary energy consumption is achieved through the hyperelastic hysteretic effect, and the screw rod is driven to reset after unloading. By combining a rotary friction and SMA superelasticity dual energy dissipation mechanism, the energy absorption efficiency and the anti-seismic property are remarkably improved; the self-resetting function is achieved through the hyperelastic effect of the SMA material, and residual deformation is eliminated; the modular design supports flexible adjustment of friction coefficients, strokes and reset force, and is suitable for manufacturing of large, medium and small dampers; and the ball screw and a standardized shell structure are convenient for batch production, and the maintenance cost is reduced. According to the scheme, an efficient, reliable and intelligent damping solution is provided for engineering structures such as bridges and buildings.

The invention discloses a design method of a composite material bushing for a heavy truck chassis. The design method comprises the following steps: firstly, carrying out physical and chemical combined modification treatment on basalt fibers; taking the modified basalt fiber as a reinforcing phase, and compounding with a hyperelastic silicone rubber emulsion serving as a base material to prepare a composite material; performing a tensile test on the composite material to obtain stress-strain data; importing stress-strain data into simulation software, constructing a finite element model of the composite material, and performing tensile simulation analysis; based on secondary development of simulation software, in combination with a representative volume element technology, the influence of fiber arrangement on the mechanical behavior of the composite material is researched; and carrying out fatigue life prediction on the composite material bushing based on a simulation result by adopting fatigue analysis software. Efficient cooperation of rigidity and toughness of the material is achieved, the anti-fatigue characteristic is remarkably improved, the service life of the lining under the heavy-load working condition is prolonged, and lightweight, energy saving and consumption reduction of a heavy truck chassis are facilitated.

The application provides an impact identification protection device based on SMA super elasticity and a working method, relates to the field of road facilities, and aims to solve the problem that wind power generation equipment is prone to misdropping under strong wind conditions or cannot be timely decoupled in the instant of collision, thereby causing equipment damage, by introducing an inductive trigger component based on shape memory alloy super elasticity; macroscopic physical deformation of a wave-shaped anti-collision beam is taken as a criterion for identifying impact load, a shape memory alloy flexible cable is arranged in an internal accommodating cavity of the anti-collision beam and is linked with a detachable locking mechanism above, mechanical material mechanics response is utilized to effectively overcome the disadvantage that a complex electric control sensor is easily disturbed in a harsh outdoor environment, passive identification of wind load and vehicle impact is realized, the daily wind resistance stability of the power generation equipment is ensured, the power generation equipment can actively avoid danger and detach in the event of a collision accident, and the collision damage rate of high-value new energy equipment and the risk caused by the scattering of debris are reduced.

The application belongs to the technical field of mechanical simulation and prediction of woven fabrics, and specifically discloses a modeling method and system of a super-elastic model for simulating wrinkles of two-dimensional woven fabrics. The method comprises: establishing a super-elastic model that comprehensively considers the mechanical behavior of two-dimensional woven fabrics, wherein the two-dimensional woven fabrics are composed of warp yarns and weft yarns that are interlaced with each other; determining a numerical implementation method of the super-elastic model in a finite element framework, wherein the numerical implementation method is realized through a subroutine interface; and simulating the wrinkles defects generated in the deformation process of the two-dimensional woven fabrics by using the finite element framework and the numerical implementation method of the super-elastic model. The super-elastic model is established by defining the strain invariants of tensile deformation, shear deformation and bending deformation of the two-dimensional woven fabrics, obtaining the corresponding strain energy function based on the strain invariants, and calculating the membrane stress and bending moment. The application can accurately simulate the wrinkles defects generated in the deformation process of the two-dimensional woven fabrics.

The present application relates to the field of pressure sensor design, and specifically discloses a pressure sensor microstructure design method based on super-elastic contact mechanics, several super-elastic constitutive models are fitted through stress-strain curves obtained by experiments, the optimal constitutive is selected by comparing the experimental and simulation results of super-elastic micro-protrusion contact; the analytical solution of super-elastic micro-protrusion contact is fitted, and its applicability to different super-elastic micro-protrusion contact problems is verified; the structure forward design meeting the requirements of target sensitivity, pressure measurement range and linearity is realized; the sensitivity curve is obtained through the electrical contact experiment, and the feasibility of the design method is verified; based on the application scene and material performance, the upper limit of the sensitivity that can be achieved by the method is given. The method has important engineering application value in the field of flexible electronics, and its outstanding advantage lies in that the microstructure parameters can be directly calculated according to the target performance requirements of the pressure sensor, realizing the accurate mapping of "performance requirements-structure parameters".

A preparation method of a high-entropy alloy with constant elasticity and super-elasticity, the alloy and applications, the method comprises the following steps: Ti, Zr, Hf, Ta and Nb are melted to obtain an alloy ingot of Ti a Zr b Hf c Ta d Nb e , wherein a, b, c, d and e are atomic percentages of the five elements, a is 25-30, b is 25-30, c is 25-30, d is 5-15 and e is 4-8, and a+b+c+d+e=100; and the alloy ingot is hot forged to obtain the high-entropy alloy. The high-entropy alloy has constant elasticity and super-elasticity and excellent mechanical properties.

The invention discloses a fabricated building structure health monitoring system and method, and relates to the technical field of building structure health monitoring, and the fabricated building structure health monitoring system and method uses an SMA spring assembly and a U-shaped buckle to connect an ardealite inner wall and a main body structure of a fabricated building, thereby greatly improving the shock resistance and safety of the fabricated building. Meanwhile, according to the hyperelasticity and the shape memory effect of the SMA spring, the heating temperature corresponding to SMA spring performance deviation recovery is analyzed, then a deformation deviation recovery curve and a fatigue deviation recovery curve of the SMA spring are obtained, in the mounting and using process of the assembly type structure, the deformation quantity and the cycle index of the SMA spring assembly are continuously monitored, and the deformation deviation recovery curve and the fatigue deviation recovery curve of the SMA spring assembly are obtained. According to the method, the performance deviation condition of the SMA spring assembly is obtained, so that the SMA spring assembly is heated to the corresponding temperature, the performance of the SMA spring assembly is repaired accordingly, the material performance degradation speed is effectively delayed, and the durability and reliability of the fabricated building structure are improved.

The invention belongs to the field of nonlinear material mechanics, and relates to a method for constructing a rubber material hyperelastic constitutive model, which comprises the following steps of: deducing to obtain a strain energy function with a non-integer power strain invariant; adopting a quasi-static stretching super-elastic constitutive test to obtain stress-strain test data; according to the function and test data, fitting to obtain material parameters of the non-integer power strain invariant strain energy function; the strain energy function is written into finite element software, and material parameters of a Neo-Hookean model are fitted according to obtained test data; and establishing a single-unit three-dimensional model, performing finite element simulation by using the obtained material parameters to obtain a finite element stress-strain simulation result, and comparing the simulation result with test data. According to the method, parameter fitting is carried out by adopting the relationship between the modulus and the strain, the strain energy function with non-integer power strain invariants is obtained through derivation, and the flexibility and accuracy of data fitting are improved.

The utility model provides an assembly type super-toughness early-strength variable-stiffness temperature variation compensation bridge expansion joint device, and relates to the technical field of bridge expansion joints, the device comprises a plurality of expansion joint units, each unit comprises a high elastic body and a super-elastic inhaul cable which are assembled in a super-toughness concrete groove, and the high elastic body and a groove wall are connected through the stay cables; a pore channel penetrates through the high elastomer; the pre-tightening force ribs sequentially penetrate through the hole channels of the high-elasticity body to play a transverse connection role. Initial tension is applied to the inhaul cable; under the extreme temperature change condition, the inhaul cable stretches the high-elastic body towards the groove wall so as to restrain the high-elastic body from arching and prevent the high-elastic body from being disengaged from the groove wall. The adopted super-toughness early strength concrete groove wall has a tensile strain strengthening function and an elastic modulus between a beam body and a high elastic body, and the variable stiffness design reduces the damage of impact load to the expansion joint. And meanwhile, a stay wire type displacement sensor and a force measuring anchor head are arranged, collected telescopic displacement and axial force signals are uploaded to a cloud end through an intelligent monitoring module, and real-time monitoring of the state of the expansion joint device is achieved.

The invention provides a finite element analysis and evaluation method for reducing tire sidewall cracks. The finite element analysis and evaluation method comprises the following steps: S10, acquiring hyperelastic constitutive parameters and fatigue grade coefficients of different types of sidewall rubber materials; s20, building a sidewall pattern model, building a font model based on the obtained rubber material parameters, and obtaining a plurality of different model schemes; different loading conditions are set, and the stress deformation conditions of the tire side wall of the tire under different conditions are simulated; s30, performing non-linear statics general simulation analysis on stretching and shearing working conditions aiming at the stress deformation of the sidewall under different loading working conditions, and calculating to obtain a stress gradient and an associated fatigue damage value; s40, the risk degrees of different model schemes are judged according to the obtained stress gradients and the associated fatigue damage values, and a double-low-risk scheme is selected according to the risk degrees; and if the double-low-risk scheme does not exist, the design is optimized through result analysis, and the steps S10-S40 are repeated until the double-low-risk scheme is obtained. According to the method, the problem of predictive quantitative evaluation of the tire sidewall crack risk is solved.

The application discloses a quasi-zero stiffness composite structure simulation method based on thermoplastic polyurethane (TPU) material and belongs to the field of composite structure design and simulation analog. In view of the problems that the traditional simulation method is difficult to accurately characterize the large deformation, super-elasticity and buckling negative stiffness characteristics of the TPU material, leads to inaccurate structure performance prediction and low design efficiency, a geometric model of a TPU core layer and a carbon fiber panel is established, a cell division grid suitable for large deformation is adopted, a super-elastic and orthogonal anisotropic material model is defined, constraints and loads are set and quasi-static compression simulation is carried out, a load-displacement curve is extracted and structure safety evaluation is completed. The method can accurately predict the static and dynamic characteristics of the quasi-zero stiffness composite structure, and provides reliable simulation support for the design and performance prediction of lightweight low-frequency vibration isolation structures in the fields of aerospace, precision instruments and the like.

The invention belongs to the technical field of wing trailing edge structure design, and provides a deformable wing trailing edge driven by a soft actuator and a performance analysis method. The efficient deformable aerodynamic configuration is formed through the synergistic effect of the deformable skin, the honeycomb structure and the soft actuator, and the problems that the aerodynamic configuration of the trailing edge of an existing wing is discontinuous, the structure is heavy, and deformation is limited are solved. The performance analysis method can accurately consider the hyperelasticity and viscoelasticity characteristics of a soft material in finite element modeling, establish a bidirectional coupling relationship between air cavity pressure and structural deformation, and realize continuous controllable deformation of the trailing edge of the wing, improvement of aerodynamic efficiency and reduction of energy consumption by combining aerodynamic analysis and multi-objective optimization. And a closed-loop process of modeling-analysis-optimization-experimental verification is formed, so that the problems of poor control precision, large prediction error and insufficient engineering feasibility in the prior art are effectively solved.

The embodiment of the invention provides a method for controlling the shape of a hyperelastic plane strain plate in a gravity environment and related equipment, and belongs to the technical field of flexible materials and intelligent structures. The method comprises the following steps: firstly, establishing a hyperelastic plate control equation considering physical strength based on a finite strain theory, and deducing a dimensionality reduction plate equation through asymptotic analysis; secondly, innovatively analyzing and inversely solving an explicit expression of a growth function required for realizing any given target curved surface, and establishing an analytic relationship among a growth field, target shape geometric characteristics and physical power; and finally, preparing a pre-strain sample by designing a mold corresponding to the target configuration, and physically realizing a growth field. The gravity is converted into a design variable from an interference factor, the influence of the gravity is compensated through growth deformation, so that the plane strain plate structure with one side clamped and supported accurately keeps the expected shape under the gravity, and the method has the advantages of being high in control precision, high in design efficiency and easy to implement and can be applied to the fields of soft robots, space deployable structures and the like.