50 results about "Nonlinear mechanics" patented technology

The invention relates to the technical field of bridge engineering, in particular to a cable structure bridge design method adopting a BIM (Building Information Modeling) model, which comprises the steps of three-dimensional bridge foundation model construction, cable structure parameterization configuration, nonlinear mechanical simulation, construction error modeling, feedback optimization and the like. Through introduction of structured geological data and NURBS curved surface reconstruction, a geological-structure integrated model is realized. Adopting a genetic algorithm and a particle swarm optimization method to intelligently configure pile foundation and cable parameters; a construction error closed-loop adjustment mechanism is constructed through dynamic simulation and real-time tension feedback control; and finally, parameter correction write-back and BIM delivery model integration is realized. According to the invention, the design precision, the construction stage adaptability and the digital delivery integrity of the cable structure can be improved, and the method is suitable for cable structure bridge engineering with complex geology and high-precision control requirements.

The invention provides a method and a system for predicting residual compression strength of a carbon fiber composite material after lightning stroke, and belongs to the technical field of electric digital data processing. According to the method, by considering the pyrolysis degree of the lightning stroke CFRP composite material, the non-linear mechanical property parameters related to the pyrolysis degree actually measured based on the test and the thermal and mechanical damage results predicted based on the electric-thermal-mechanical multi-physics field coupling model are calculated; an actually measured nonlinear mechanical property thermal damage factor and a mechanical damage factor caused by impact damage are introduced into a constitutive relation of the CFRP composite material, and a finite element simulation method capable of quantitatively predicting the residual compression strength after lightning stroke is established by virtue of finite element software ABAQUS; the problems that in the prior art, the influence mechanism of lightning stroke damage on the mechanical property of the CFRP composite material is not clear, and a simulation modeling method capable of being directly used for calculating and predicting the residual compression strength after lightning stroke is lacked are solved.

The invention relates to the technical field of computers, and discloses a rock creep model construction method and device and a rock failure mode determination method. The method comprises the steps of obtaining a data set; samples in the data set comprise input data and output data, the input data comprise creep load holding time, sample rock stress data, initial macroscopic damage data, initial microscopic damage data, long-term strength and a creep starting threshold value, and the output data is a strain true value; fitting the initial rock creep model by using the data set to obtain a final rock creep model; wherein the initial rock creep model comprises at least one of a damaged elastomer strain item, a damaged viscoelastomer strain item and a damaged viscoplastic body strain item; each strain item comprises a macro-micro nonlinear coupling damage item, and the macro-micro nonlinear coupling damage item is generated based on the initial micro damage data and the initial macro damage data. The model constructed by the method can truly reflect the nonlinear mechanical response of the rock mass under the combined action of the multi-scale initial defects.

The invention discloses a concrete panel tensile crack damage calculation method and a concrete panel tensile crack damage calculation system, which combine extended finite element calculation with a concrete tensile crack damage calculation model, accurately simulate crack behaviors in concrete, and are particularly suitable for numerical simulation requirements under the conditions of complex crack networks and large-scale damage. According to the method, the expansion finite element method is introduced, subtle changes of crack starting, expansion paths and final forms are captured on the premise that the calculation cost is not increased, the common problem of grid dependence in a traditional finite element method is avoided, fine division or frequent updating of grids is not needed, and the calculation efficiency is improved. The method reduces the preprocessing time and iteration times, reduces the consumption of overall computing resources, can accurately describe the expansion path of the crack and the nonlinear mechanical behavior of the concrete, and is suitable for the simulation of a complex crack network.

The invention discloses an aircraft skin assembly control method and system, and the method comprises the following steps: segmenting a skin and a frame from an image based on a skin surface image through employing a deep learning segmentation model; registering and splicing the images captured by different spectrum cameras to obtain a complete skin image; based on the complete skin image, using a region expansion method to identify and track a skin surface deformation region; preprocessing the original skin model through a finite element method to obtain a corresponding grid model; estimating stress distribution in the current assembly state based on the force haptic image and a stress transfer model; and based on the deformation area and the stress distribution, generating an assembly path and a pressure adjustment instruction by adopting a self-adaptive control strategy, and controlling the assembly process. Through fusion of a multispectral vision technology and a high-precision force tactile perception technology and combination of a deep learning algorithm and a nonlinear mechanical model, accurate identification of skin surface features and accurate positioning of a deformation area are realized, and the assembly control precision is improved.

The invention relates to the field of clearance checking of a vehicle chassis part DMU (digital prototype), in particular to clearance checking between parts with large deformation. Specifically, the invention provides a dynamic gap checking method based on flexible body deformation coupling analysis, and the method comprises the steps: building a flexible body nonlinear mechanical model through finite elements, applying boundary conditions such as working conditions and loads, executing large deformation and nonlinear analysis, and obtaining deformation data of an anisotropic material under a limit load; converting the deformation data into a parameterized entity model through a geometric reconstruction algorithm, and constructing a high-precision digital prototype; multi-degree-of-freedom kinematics simulation is implemented in a DMU module of three-dimensional design software, and three-dimensional space analysis is performed on dynamic gaps between flexible bodies and between flexible and rigid bodies in combination with a contact interference analysis algorithm. The method can be used for checking the clearance between the moving parts, judging the interference of the moving parts and confirming the operation stability of the vehicle in complex and severe working conditions.

The invention discloses a fatigue simulation method for nonlinear energy dissipation of an asphalt mixture, which abandons a simplified hypothesis of a traditional linear damage model, and accurately depicts a residual bonding radius multiplier change rule of the asphalt mixture in an initial stage, a micro-damage stage, an accelerated damage stage and a damage stage through a piecewise function. According to the method, nonlinear mechanical behaviors of a material in different damage stages can be accurately captured, meanwhile, model parameters are accurately calibrated in combination with an ant colony optimization algorithm, a model parameter space is efficiently searched by simulating colony intelligent behaviors of ant colony foraging in nature, and an optimal parameter combination is found, so that the optimal mechanical behavior of the material is obtained. The simulation result is highly matched with the test result, the accuracy of fatigue life prediction is remarkably improved, the prediction error is effectively reduced, a more reliable theoretical basis is provided for the structural design of the asphalt pavement, and the service life of the pavement is prolonged.

The invention discloses an intelligent vehicle stability and trajectory tracking cooperative control method in a tire burst scene, and belongs to the technical field of unmanned vehicle control. The invention aims to provide a cooperative control method for stability and trajectory tracking of an intelligent vehicle in a tire burst scene, which is based on a nonlinear model predictive control (NMPC) strategy and fuses nonlinear mechanical characteristics of tires and vehicle state prediction. According to the method, firstly, a vehicle second-order reference model is designed, then a complete vehicle dynamics model is established, and finally, an NMPC control framework with the three-degree-of-freedom vehicle dynamics model as the core is established. According to the method, based on a nonlinear model predictive control strategy, nonlinear mechanical properties of the tire and vehicle state prediction are fused, and vehicle instability can be effectively inhibited while accurate trajectory tracking is achieved.

A method for calculating the in-plane nonlinear deformation of an arch structure with axial defects in a Cartesian coordinate system is presented. This method is based on two states of the arch structure's curve element in the Cartesian coordinate system: an ideal axis and an actual axial defect. It derives the changes in the arc length and curvature of the curve element before and after deformation, obtaining expressions for the nonlinear compressive and bending strains in the in-plane of the arch structure with axial defects in the Cartesian coordinate system. The method also derives the nonlinear equilibrium differential equations in the in-plane of the arch structure with axial defects in the Cartesian coordinate system, obtaining solutions that satisfy the mechanical and geometric boundaries of the arch structure with axial defects. Finally, the method derives the nonlinear equilibrium governing equations in the in-plane of the arch structure with axial defects, ultimately obtaining the solution to the nonlinear mechanical problem in the in-plane of the arch structure with axial defects in the Cartesian coordinate system. This method can obtain the essence of the nonlinear mechanical problem of the arch structure with axial defects in the Cartesian coordinate system, filling the gap in the nonlinear strain-displacement expression for the in-plane of the arch structure with axial defects in the Cartesian coordinate system.

The invention discloses a seismic response analysis method for a magnetic levitation line axle coupling system with a seismic isolation support. The method comprises the steps that a motion equation of the magnetic levitation line axle coupling system considering nonlinear mechanical behaviors of the seismic isolation support under the seismic action is constructed; and solving the motion equation by considering equivalent linearization and separation iteration to obtain the dynamic response of the maglev line vehicle and the bridge. According to the method, a bridge model considering the nonlinear hysteresis behavior of the seismic isolation support and a magnetic track interaction model based on PID active control are established, and unified seismic analysis is carried out on strong nonlinear energy consumption of the seismic isolation support and specific active control dynamics of a magnetic levitation vehicle; the problem that an existing universal axle coupling analysis method cannot be directly applied to the complex system is solved.

The invention discloses a self-adaptive first-aid training human body strength model which comprises a thoracic cavity body, a sensor module and a main control system, and relates to the technical field of emergency rescue skill training equipment. Through rigidity adjustment of the nickel-titanium memory alloy frame, pressing force requirements of students of different age groups are accurately met, the students can form correct pressing manipulation memory in training, the springs do not need to be manually replaced, the master control system automatically adjusts chest hardness according to student information, teaching efficiency is effectively improved, and the training efficiency is improved. And the hardness of the thoracic cavity body is adjusted by responding to the pressing force and posture changes in real time, so that the thoracic cavity hardness presents nonlinear mechanical characteristics similar to a real human body, the training simulation authenticity is effectively enhanced, and the method is closer to an actual first-aid scene.

The invention relates to the technical field of engineering equipment life prediction, and discloses a rubber support life prediction method and device, electronic equipment and a storage medium, and the method comprises the steps: collecting mechanical response data and environmental parameters, comprehensively reflecting the actual working condition and environmental change of a rubber support, and then employing a multi-scale feature extraction technology to achieve the prediction of the service life of the rubber support; physical characteristic quantities such as a dynamic stiffness ratio, a hysteretic loop asymmetry degree and an ozone-temperature and humidity synergistic aging factor are obtained, and the nonlinear mechanical property and the performance evolution trend of the support are accurately described; and fusing the features to form a comprehensive vector, integrating multi-dimensional information of mechanical properties and environmental influence factors, and inputting the integrated information into a prediction model for life prediction. A prediction model is constructed based on a physical constraint gating circulation unit, physical rules such as an aging index range and residual life non-negativity are fused in training, loss function constraints such as monotonicity and end-phase behaviors are added, and it is ensured that prediction follows a material mechanics law.

The application discloses a kind of complex superstructure multi-class strong nonlinear curve prediction method and system, and relates to superstructure technical field.For the problems, such as complex mechanical behavior, strong nonlinear characteristics, multiple types and excessive calculation cost, encountered in current complex superstructure mechanical property curve prediction, the application greatly improves the prediction accuracy of multi-class strong nonlinear curve by accurately describing the curve characteristics;And effectively avoids the problem of mixed variety of curve characteristics, only a small amount of data is needed to complete the construction of prediction model, reduces the cost of data generation and neural network training.The application provides a new idea for the prediction of complex superstructure multi-class strong nonlinear mechanical property curve, and has good application prospect in the field of complex superstructure research.

This application provides a method and apparatus for calculating the dynamic response of a rotor-support-casing system, belonging to the field of aerospace rotating machinery structures. The method includes: establishing a dynamic model of the rotor system; establishing nonlinear mechanical models for each component separately, and synthesizing them to obtain a dynamic model of the support system; integrating the dynamic models of the rotor system and the support system to form a dynamic model of the rotor-support system; establishing a dynamic model of the casing system, and setting coupling points at the connection between the casing and the support; based on a data interaction and time-step synchronization mechanism, transferring mechanical quantities between the dynamic models of the rotor-support system and the casing system through the coupling points, performing joint time-domain numerical integration to obtain the dynamic response of the entire system. The method and apparatus provided in this application can efficiently and accurately calculate the coupled dynamic response of the rotor-support-casing system.

The present application relates to the field of clearance checking of vehicle chassis components DMU (digital mockup), especially clearance checking between components with large deformation. Specifically, the present application provides a dynamic clearance checking method based on flexible body deformation coupling analysis, a flexible body nonlinear mechanics model is established through finite element, boundary conditions such as working condition and load are applied, large deformation and nonlinear analysis are executed, and deformation data of anisotropic material under limit load are acquired; the deformation data is converted into a parameterized solid model through a geometry reconstruction algorithm, and a high-precision digital mockup is constructed; multi-degree-of-freedom kinematics simulation is implemented in the DMU module of a three-dimensional design software, and three-dimensional space analysis is performed on the dynamic clearance between flexible bodies and between flexible and rigid bodies in combination with a contact interference analysis algorithm. The method can be used to realize clearance checking between moving components, determine the interference of moving components, and confirm the handling stability of a vehicle in complex and severe working conditions.

The invention discloses a multi-class strong nonlinear curve prediction method and system for a complex superstructure, and relates to the technical field of superstructures. Aiming at the problems of complex mechanical behaviors, strong nonlinear characteristics, multiple types, too high calculation cost and the like in the current complex superstructure mechanical property curve prediction, the method greatly improves the prediction accuracy of the multiple types of strong nonlinear curves by accurately describing the curve characteristics; and moreover, the problem that multiple curve features are mixed is effectively avoided, construction of the prediction model can be completed only by a small amount of data, and the cost of data generation and neural network training is reduced. The method provides a new thought for predicting the multi-class strong nonlinear mechanical property curve of the complex superstructure, and has a good application prospect in the field of complex superstructure research.

The invention discloses an adapter multi-rigid-body dynamic modeling method based on pre-pressing and flexibility characteristics. According to the invention, an adapter model is dispersed in a multi-rigid-body dynamic framework, and a nonlinear spring-torsion spring unit is introduced to realize flexible deformation, so that the nonlinear mechanical response of an adapter body in a launching process is effectively simulated; based on a nonlinear rigidity curve calibrated by an experiment or simulation, the compression and torsion response of the adapter is accurately reproduced; through the spring original length offset correction technology, the actual assembly pre-compression state is directly mapped, and the initial condition accuracy is improved. According to the invention, the pre-pressing of the adapter and the nonlinear mechanical response of the adapter in the launching process can be effectively simulated, and the large subsample calculation and rapid iteration requirements of a rocket launching system are met.

The application discloses a kind of high-efficiency simulation methods of GIL corrugated pipe based on finite element, comprising the following steps: S1: taking the corrugated pipe in straight line GIL as research object, the geometric modeling of SF6 insulating gas, external air area is carried out to corrugated pipe body;S2: according to the structural parameters of corrugated pipe, corresponding material setting and nonlinear mechanics modeling are carried out;The state of contact surface and the stress distribution of contact body of GIL corrugated pipe structure are influenced mutually in the process of bearing load;Based on three-dimensional nonlinear finite element theory and further analysis method, the large deformation effect of structure is considered, the geometric nonlinear behavior of structure is studied, and the calculation precision is higher relative to analytical calculation method;By the theoretical calculation and definition of the parameters of equal cross-section pipe, the finite element calculation model that can be equivalent to replace the corrugated pipe is established;While guaranteeing the analysis precision, the time used for analysis is greatly shortened, and it is more suitable for the use of GIL in multi-field coupling analysis.

The invention belongs to the field of crustal stress measurement, and provides a crustal stress measurement method based on a nonlinear mechanical theory, which comprises the following steps: firstly, measuring a stress-strain curve of a strain hardening material to obtain mechanical parameters, and then constructing a measurement platform comprising a concrete cube, an elastic-plastic thick-wall cylinder and a precise range finder; the thick-wall cylinder is embedded into a concrete through hole and is internally provided with a precise range finder to monitor the change of the inner diameter. A compression test is carried out through multiple groups of horizontal pressure stresses, numerical simulation is combined, and a nonlinear model about the horizontal pressure and mechanical parameters and geometric parameters of the thick-wall cylinder is constructed by applying a Bayesian neural network and a data augmentation technology. The method comprises the following steps: placing a crustal stress observation instrument in an underground soft rock area or a fracture zone deep hole, continuously monitoring the change of the inner diameter of a thick-wall cylinder after coupling with concrete, and determining maximum and minimum principal stress and directions according to a nonlinear model; by means of the method, scientific and technical support can be provided for deep ground scientific exploration and underground engineering construction.

The invention relates to the technical field of battery testing, and discloses a battery pack structural adhesive modeling method, device and equipment, a medium and a program product, and the method comprises the steps: carrying out a sweep frequency test on a battery module comprising a plurality of battery cells, and obtaining a first main frequency, displacement data and acceleration data; constructing an equivalent model comprising a plurality of springs, determining a stiffness coefficient matrix of the plurality of springs according to the displacement data and the acceleration data, and performing sweep frequency simulation on the equivalent model to obtain a second main frequency; calculating an error value between the main frequencies, and adjusting the stiffness coefficient matrix according to the error value until the error value is smaller than a preset error threshold value; and determining an equivalent model according to the adjusted stiffness coefficient matrix. According to the method, the nonlinear mechanical behavior of the structural adhesive can be simulated, so that when the finite element model is constructed, the influence of the nonlinear compression and tension mechanical behavior on the performance of the battery pack is fully considered, the accuracy of the random vibration finite element model of the battery pack is improved, and the reliability of the vibration test of the battery pack is improved.

The invention belongs to the related technical field of structure optimization, and discloses a programmable nonlinear mechanical response structure topology optimization method, which comprises the following steps: (1) constructing a strain energy function of a finite element based on a strain energy interpolation scheme, the finite element being obtained by dividing a design domain of a to-be-optimized structure; (2) based on the strain energy function of the finite element, an improved generalized displacement control method is adopted to solve the nonlinear finite element equilibrium equation of the structure, and the nonlinear mechanical response and tangent stiffness response of the structure are calculated based on the solved result; and (3) constructing a structure topological optimization model of the programmable nonlinear mechanical response based on the obtained nonlinear mechanical response and the tangent stiffness response, and further realizing topological optimization of the to-be-optimized structure by adopting the structure topological optimization model. According to the method, the programmable precision of nonlinear mechanical behaviors with complex structures is remarkably improved.

This invention relates to the fields of vibration control and nonlinear mechanics, and provides a programmable method for generating two-dimensional nonlinear forces. The method includes: responding to a two-dimensional nonlinear force generation request; acquiring the structure and structural parameters of a mechanical realization device; determining the trajectory of the center point of a rolling component during motion based on mechanical equilibrium relationships, and acquiring the geometric expression of the rolling component's trajectory surface; and, based on the geometric dimensions of the rolling component, performing equidistant mapping along the normal direction on the rolling component's trajectory surface, causing the rolling component to adhere to and roll along a three-dimensional guide surface, thereby generating a nonlinear force corresponding to a target nonlinear force function. This method not only generates nonlinear forces of arbitrary continuous form based on a preset target force function and supports personalized customization of nonlinear stiffness characteristics, but also generates nonlinear forces that meet target requirements in two mutually orthogonal motion directions.

The nonlinear mechanical model for representing the excavation damage-long-term deterioration effect of the engineering rock mass is provided and comprises the following steps that S1, a true triaxial static test is carried out, and a peak intensity rule is researched; s2, carrying out a true triaxial multi-stage aging static test, and analyzing an aging critical strength rule and anisotropic aging damage evolution characteristics; s3, establishing an anisotropic aging damage evolution equation; s4, constructing a homogeneous rock maximum failure constitutive equation under the true three-dimensional stress; s5, constructing a viscoelastic constitutive equation in which the true three-dimensional stress aging effect is introduced; s6, compiling the constitutive model established in S5 into a numeralization subprogram; s7, obtaining a maximum failure function parameter of the homogeneous rock in a peak state; s8, obtaining a three-dimensional aging yield function parameter of the homogeneous rock in an aging critical state; and S9, verifying the prediction effect and applicability of the model on the aging deformation evolution of the homogeneous rock. According to the method, theoretical characterization of the whole process of excavation damage and aging degradation of the engineering rock mass under the true three-dimensional stress is achieved.

This invention discloses a statistical damage constitutive modeling method considering multi-stage fatigue loading of rock, comprising the following steps: describing the damage of rock micro-element based on the Weibull probability distribution and establishing the relationship between damage variables and strain; dividing the constitutive model into a compaction stage and a post-compaction stage according to the initial compaction characteristics of the rock stress-strain curve, and establishing damage constitutive equations for each stage; establishing constitutive relations for loading, unloading, and secondary loading processes for multi-stage fatigue loading, and considering the cumulative effect of fatigue strain; solving the model parameters using the extreme point method to achieve theoretical modeling of the multi-stage fatigue constitutive curve of rock. This method fully considers the fatigue strain behavior generated during secondary loading, and the model parameters are all explicit, reflecting the nonlinear mechanical behavior under multi-stage fatigue loading well, and has high prediction accuracy and practical application value.

This invention belongs to the field of mechanical analysis technology and provides a method and system for elastic beam deformation analysis based on fourth-order nonlinear differential equations. The method includes: obtaining the stress-strain relationship and lateral displacement function of the elastic beam; constructing a fourth-order nonlinear mechanical response function of the elastic beam based on the obtained stress-strain relationship and lateral displacement function; solving the constructed fourth-order nonlinear mechanical response function to identify the local buckling location and higher-order shear effects of the elastic beam; taking the minimum weight of the elastic beam as the objective function, considering the displacement and stress constraints of the elastic beam, performing sensitivity analysis of the elastic beam based on the obtained local buckling location and higher-order shear effects, adjusting the nonlinear coefficient of the elastic beam, and completing the elastic beam deformation analysis based on fourth-order nonlinear differential equations.

The invention relates to the technical field of rock mechanics and engineering, in particular to a method for establishing a rock reinforcement-damage constitutive model based on an energy principle. The method comprises the following steps: acquiring the elastic modulus, the elastic strain energy and the dissipation energy of the weak rock; dividing the deformation failure process of the weak rock into an enhancement stage and a damage stage; obtaining an enhanced evolution equation and a damage evolution equation; and obtaining a constitutive model of an enhancement stage and a constitutive model of a damage stage, and combining the constitutive model of the enhancement stage and the constitutive model of the damage stage to obtain an enhancement-damage constitutive model for simulating to obtain nonlinear mechanical parameters of the weak rock. According to the method, the internal structure and the stress state of the rock can be comprehensively considered, and an important theoretical thought is provided for accurately reflecting the nonlinear mechanical behavior characteristics of the weak rock.

The invention belongs to the technical field of mechanical analysis, and provides an elastic beam deformation analysis method and system based on a fourth-order nonlinear differential equation, and the method comprises the steps: obtaining a stress-strain relation and a transverse displacement function of an elastic beam; constructing a fourth-order nonlinear mechanical response function of the elastic beam based on the obtained stress-strain relation and the transverse displacement function; solving the constructed fourth-order nonlinear mechanical response function, and identifying a local buckling position and a high-order shear effect of the elastic beam; taking the minimum weight of the elastic beam as a target function, considering the displacement constraint and stress constraint of the elastic beam, carrying out the sensitivity analysis of the elastic beam according to the obtained local buckling position and high-order shearing effect of the elastic beam, adjusting the nonlinear coefficient of the elastic beam, and completing the deformation analysis of the elastic beam based on the fourth-order nonlinear differential equation.

This specification relates to the field of circuit breaker simulation technology, and more particularly to a method and apparatus for simulating the dynamics of a circuit breaker. The method for simulating the dynamics of a circuit breaker includes: constructing a first multibody dynamics model of the transmission mechanism in the circuit breaker; extracting first motion boundary conditions for a target interface based on the global simulation results of the first multibody dynamics model; constructing a finite element model of the target interface; obtaining first local simulation results of the finite element model based on the first motion boundary conditions; constructing equivalent nonlinear mechanical elements based on the first local simulation results; updating the first multibody dynamics model based on the nonlinear mechanical elements to obtain a second multibody dynamics model; and obtaining the dynamics simulation results of the transmission mechanism based on the second multibody dynamics model and the finite element model. The embodiments in this specification can improve the accuracy of dynamics simulation of circuit breaker transmission mechanisms.

The invention discloses a mechanical structure reverse design method and system based on a series neural network, and the method comprises the steps: discretizing a lattice structure unit into a three-dimensional binary voxel matrix, and carrying out the normalization and resampling of a stress-strain curve; a three-dimensional convolutional neural network is trained to serve as a forward proxy model of freezing parameters, a reverse generation model with a target curve as input is constructed, and a closed loop of'target curve-generation structure-performance prediction 'is formed through a series architecture; optimizing the reverse model by adopting a composite loss function, and outputting a voxel structure with a clear boundary and a reasonable filling rate; and a dot matrix design scheme is generated after threshold binarization. According to the method, the problem of unstable training caused by many-to-one mapping in reverse design is effectively solved, generation of a fuzzy gray level structure or a high-filling-rate solid block is avoided, and precise customization of nonlinear mechanical behaviors in the whole process is realized; and the customization design capability and the engineering landing feasibility of the lattice structure in the fields of aerospace, automobile safety and the like are remarkably improved.

The invention discloses a composite material nonlinear mechanical constitutive model construction and finite element analysis method, and belongs to the field of finite element analysis. The method comprises the following steps: defining an orthotropic elastic-plastic constitutive model; calculating a numerical value of the orthotropic elastic-plastic constitutive model by adopting a return mapping algorithm, and calculating a finally converged target elastic strain, a target plastic strain and a target effective stress; based on a plastic mechanical calculation mode, determining a consistent tangent stiffness matrix without considering the damage; and embedding the target elastic strain, the target plastic strain, the target effective stress and the consistent tangent stiffness matrix without considering the damage into the damage model to determine a consistent tangent stiffness matrix coupled with the orthotropic elastic-plastic damage, and obtaining a numerical value of an orthotropic elastic-plastic damage constitutive model to perform finite element calculation analysis. According to the scheme, the constitutive model with orthoanisotropy, elastoplasticity and damage coupled is constructed, and the prediction precision of the model is improved.