52 results about "Phase field models" patented technology

The invention discloses a reactor nuclear material cross-scale simulation method coupling microstructure simulation and mechanical-thermal performance calculation. The method comprises the following steps: a, planning a most unit sampling point through a most unit method; b, simulating through a mesoscale phase field model to obtain force thermal parameters; c, the force and heat parameters are input into a finite element model to be simulated to obtain force and heat performance; d, the mechanical and thermal performance is input into the phase field model for simulation to obtain the structure morphology of the target nuclear material; e, obtaining a macroscopic scale-mesoscopic scale coupling model by circulating the step c and the step d; f, obtaining a strong coupling model through physical time axis control; and g, constructing a database of the relationship between the mechanical and thermal parameters and the mechanical and thermal performance through a data-driven neural network algorithm. According to the method, strong coupling is achieved through parameter transmission of the mesoscale phase field model and the macroscale finite element, the macroscale and the mesoscale are connected through the most element method, the parameter transmission precision can be adjusted according to convergence, and novel reactor material mechanical and thermal performance prediction can be achieved.

The invention relates to the technical field of numerical simulation of additive manufacturing nickel-based superalloy, and discloses a temperature field and phase field coupling simulation method of SLM forming nickel-based superalloy, which comprises the following steps: establishing a three-dimensional model of a forming part and a substrate for processing to obtain a temperature field basic model; simulating an SLM forming process on the temperature field basic model according to preset parameters to obtain temperature field data, and importing the temperature field data into a phase field simulation module to serve as predefined temperature field data; coupling the gamma ' / gamma mismatch degree and temperature correlation data to the basic phase field model to obtain a gamma' phase change model, correcting the gamma 'phase change model in combination with predefined temperature field data, and adding a nucleation model based on a Poisson seed method; and based on the gamma'phase change model and the nucleation model, growth and coarsening behaviors of the gamma 'phase in the SLM material increasing process are obtained, and a simulation report is formed. According to the method, the vacancy of gamma'phase structure evolution of the existing nickel-based superalloy with high (Al + Ti) content under the SLM complex thermal history condition is solved, and important help is provided for regulating and controlling the structure to obtain the required mechanical property.

The invention belongs to the technical field of fracture mechanics calculation, and particularly relates to a hybrid unit beam structure dynamic fracture phase field calculation method. The method comprises the following steps: determining material parameters required by the dynamic fracture phase field calculation of the hybrid unit beam structure; establishing a hybrid unit beam structure dynamic fracture phase field mathematical model according to the Lagrange action quantity principle, wherein the mathematical model comprises a displacement field control equation and a phase field evolution control equation; numerical discretization is carried out on the mathematical model, and a hybrid unit beam structure discrete model is established; and adopting a Newmark method in combination with an interlacing algorithm to carry out numerical solution on the mathematical model after numerical discretization until the displacement field and the phase field both meet convergence conditions, and obtaining a dynamic fracture phase field evolution result of the hybrid unit beam structure. The problem that an existing fracture phase field model cannot accurately simulate crack evolution of the beam structure on the thickness under the dynamic load is solved, and meanwhile the calculation cost for simulating the dynamic fracture of the beam structure is remarkably reduced.

The application discloses a preparation method for regulating and controlling ferroelectric texture ceramic grain size by using a phase field method simulation technology, and comprises the following steps: preparing a series of microcrystalline powders with different size distributions; setting an initial phase field structure meeting the particle size distribution; establishing a phase field model for grain orientation growth; simulating and analoging the grain orientation growth process; preparing a film; preparing a green body with microcrystalline parallel distribution; and preparing ferroelectric texture ceramics with target grain size distribution. The application fully utilizes the computer simulation intelligent prediction guidance technology, does not need repeated trial and error experiments, saves time and effort, has good product reproducibility and stability, easily realizes accurate control of the ferroelectric texture ceramic grain size distribution, and is easy to be industrialized; the application effectively controls the occurrence of grain abnormal growth, maintains high grain orientation, and promotes the densification of the ceramic; and the application can not only prepare high-texture-density ferroelectric ceramics, but also regulate and control the grain size.

The invention discloses an integral transformation fracture phase field model implementation method of a random-order polynomial cohesion law, and belongs to the technical field of phase field model finite element analysis. The method comprises the following steps: inputting a parameter equation of a polynomial cohesion law of any order and a target order into a subprogram; deducing a cohesion eigenfunction of a random-order polynomial cohesion law by using a subprogram to determine an analytical expression of a random-order polynomial energy density eigenfunction, solving a target-order polynomial energy density eigenfunction expression and first two-order derivatives thereof, and determining an expansion expression at a zero point by using Maclaurin series; and inputting the target-order polynomial energy density eigenfunction expression, the first two-order derivatives thereof and the expansion expression at the zero point into a phase field model solver to obtain a calculation result of the target-order polynomial integral transformation fracture phase field model. According to the method, the simulation calculation of the integral transformation fracture phase field model of the target-order polynomial cohesion law can be realized under a universal finite element framework, and the accuracy and the efficiency are improved.

The invention discloses a calculation method of an integral transformation fracture phase field model for conformal interpolation reconstruction, and belongs to the technical field of finite element analysis of phase field models. The method comprises the following steps: inputting an interpolation coefficient obtained by performing segmented cubic Hermite interpolation reconstruction on a complex target curve into a subprogram; solving a general term expression of an interpolation segmentation energy density eigenfunction based on a continuity condition by utilizing a subprogram, and determining an interpolation segmentation energy density eigenfunction expression and first two-order derivatives thereof by combining an interpolation coefficient; and inputting the interpolation segmentation energy density eigenfunction expression, the first two-order derivatives of the interpolation segmentation energy density eigenfunction expression and the expansion at the inflection point into a solver for performing an integral transformation fracture phase field model to obtain a simulation result of the integral transformation fracture phase field model of the complex target curve. According to the method, the simulation calculation of the integral transformation fracture phase field model of the complex curve with the inflection point can be realized under a universal finite element framework, and the accuracy and the calculation efficiency are greatly improved.

The invention discloses a nuclear fuel particle fracture analogue simulation method based on a fracture phase field method, belongs to the technical field of nuclear fuel particle fracture simulation, and aims to solve the problems that the research efficiency is low and the application range of a numerical model is limited when a traditional method is used for a complex fracture condition. The method comprises the steps of building a phase field model, inputting material attribute parameters, setting boundary conditions of nuclear fuel particles, adding irreversibility constraints into an evolution equation of the phase field model, setting differentiated analogue simulation step lengths and outputting simulation results. Spatial distribution of phase field variables is used as characterization of a damaged area and a crack form, and real-time tracking of a crack tip position and an expansion path is not needed; for scenes such as multi-particle intersection cracks, branch cracks and irregular cracks which are difficult to process by a traditional method, accurate simulation can be realized only through phase field variable evolution without adjusting a grid or a calculation model.

The application belongs to but is not limited to the technical field of electronic core industry, and discloses a polycrystalline NCM electrode particle cracking and pulverization prediction method and system, which comprises the following steps: constructing an anisotropic polycrystalline fracture phase field model, including a grain boundary phase field equation, a solid mechanics equation, a Li + diffusion equation and a fracture phase field equation; constructing a two-dimensional geometry of a polycrystalline NCM electrode particle, setting required parameters of physical fields, carrying out grid division and setting initial conditions and boundary conditions; using a finite element simulation software to perform numerical solution, and obtaining cracking and pulverization distribution of the polycrystalline NCM electrode particle. + The application considers bidirectional coupling of Li diffusion and mechanical stress, cracking and pulverization and mechanical stress, and uses grain boundary phase field calculation to correct the critical energy release rate, so that the application can accurately reflect the mechanism of cracking and pulverization of the polycrystalline NCM electrode particle, and improve the accuracy of cracking and pulverization prediction.

A simulation method of microvoid evolution in electric field induced interconnection wire based on phase field method, including constructing a phase field model of microvoid evolution in electric field induced face-centered cubic metal {110} orientation "bamboo joint" interconnection wire based on coupled Cahn-Hilliard equation and Allen-Cahn equation; constructing phase field variables of microvoid and grain boundary; constructing distribution functions of electric conductivity and atomic migration rate varying with spatial coordinates; constructing system free energy function F , introducing a free energy function of four double potential well function to modify Cahn-Hilliard equation and Allen-Cahn equation, obtaining phase field control equation of the system; determining conservative phase field order parameter, non-conservative phase field order parameter and electrostatic field parameter, obtaining microvoid evolution in transgranular interconnection wire by coupling phase field and electrostatic field. A direct quantitative tool for the reliability of integrated circuit interconnection wire is proposed.

The invention provides a steel rail fatigue crack simulation method and system based on a fracture phase field fatigue model, and relates to the technical field of rail traffic structure safety and computational mechanics, and the method comprises the following steps: obtaining geometry, material and wheel load parameters of a steel rail; a three-dimensional steel rail finite element model is constructed according to the basic data, and local encryption grids are arranged in wheel-rail contact and other key areas; on the basis, establishing a fracture phase field model capable of describing natural initiation and expansion of cracks; a fatigue degradation model is further integrated, crack resistance attenuation caused by fatigue is simulated, and a phase-field fatigue coupling model is formed; and finally, simulating a moving wheel load through envelope loading, and performing efficient calculation by applying a cyclic transition strategy to realize accurate simulation of a fatigue crack initiation position, an expansion path and damage field distribution of the steel rail. According to the method, crack evolution can be naturally predicted, and the high-cycle fatigue analysis efficiency is remarkably improved.

The invention belongs to the technical field of microwave rock breaking, and provides a phase field simulation method for quasi-static hydrofracture of a thermoelastic porous medium under the condition of high-energy fracturing, which comprises the following steps of: firstly, acquiring parameters of a target reservoir and parameters of fluid in the target reservoir; secondly, microwave parameters are set on the basis of target reservoir parameters and fluid parameters in a target reservoir, and a phase field model of quasi-static hydraulic fracturing of the thermoelastic porous medium under the microwave-assisted fracturing condition is established; then, the target reservoir is irradiated with the microwave parameters, and the phase field model is used for simulating the crack evolution process during hydraulic fracturing; according to the method, the crack initiation difficulty of hydraulic fracturing can be reduced through microwave-assisted heating.

The present disclosure relates to a two-phase interface area calculation method and system for simulating two-phase flow by a phase field model, the method comprising the following steps: S1, extracting the order parameter value at each lattice point from the phase field model simulation result, and calculating the order parameter gradient value at each lattice point; S2, calculating the bulk free energy density and the interface free energy density of each point in the two-phase system according to the order parameter value and the order parameter gradient value; S3, volume-integrating the calculated bulk free energy density and the interface free energy density to obtain the system free energy F(φ); S4, calculating the surface tension value σ of the two-phase system according to the parameter setting of the phase field model; and S5, calculating the interface surface area A according to the system free energy F(φ) and the surface tension value σ F The method of the present disclosure avoids the complex interface discretization process, thus avoiding the complex grid discretization algorithm and data structure storage mode related thereto, and the method is easy to implement parallel computing and can further improve the calculation efficiency.

This invention discloses a method for establishing a phase-field model of a polycrystalline phase relaxor ferroelectric, the method comprising the following steps: 1. Determining the free energy of the polycrystalline phase relaxor ferroelectric; 2. Determining the order parameter of the polycrystalline phase relaxor ferroelectric as spontaneous polarization. P i 3. Represent free energy as spontaneous polarization P i The invention employs several methods: 1) introducing ferroelectric-ferroelectric phase boundaries and random local electric fields; 2) solving the Ginzburg-Landau partial differential equations to obtain the spatial evolution of spontaneous polarization, thereby determining the domain structure of polycrystalline relaxed ferroelectrics and ultimately establishing a phase-field model for polycrystalline relaxed ferroelectrics. Based on a model ferroelectric system, this invention, by considering ferroelectric-ferroelectric phase boundaries and random local electric fields, reproduces the unique domain structure characteristics of polycrystalline relaxed ferroelectrics with the coexistence of multiple nanometer-sized ferroelectric phases, establishes a phase-field model for polycrystalline relaxed ferroelectrics, and improves the theoretical model of polycrystalline relaxed ferroelectrics, which is beneficial for guiding the design of novel high-performance ferroelectric materials.

The invention provides a microalloy steel multi-mode mechanical property prediction method and device and a readable storage medium, and relates to the technical field of steel performance prediction. The method comprises the following steps: constructing and verifying a phase field model based on thermodynamics and phase field dynamics of a microalloyed steel system to obtain a phase field simulation microstructure image of microalloyed steel; alloy component data and heat treatment process data on a production line are collected, and phase field simulation microscopic structure images and mechanical property indexes corresponding to the alloy component data and the heat treatment process data are obtained; performing standardized preprocessing and sample construction on the phase field simulation microscopic structure image, the alloy component data, the heat treatment process data and the mechanical property indexes, and performing data set division; establishing a multi-modal deep learning model containing an image branch and a numerical branch; carrying out training, evaluation and hyper-parameter optimization based on the training set and the test set, and determining an optimal multi-modal deep learning model; and determining a mechanical property prediction result of the to-be-tested sample based on the optimal multi-modal deep learning model.

The invention relates to the field of modeling methods, and particularly discloses an SAC305 lead-free solder viscoplastic corrosion fracture phase field modeling method, which comprises the following steps: determining SAC305 material viscoplastic constitutive model parameters based on stress-strain data of a uniaxial tensile experiment; carrying out a corrosion experiment on the SAC305 material, and determining a corrosion morphology evolution rule of the SAC305 material; and establishing a corrosion-fracture phase field model, and calibrating phase field model parameters. According to the scheme, constitutive model parameters of SAC305 are calibrated according to a uniaxial tensile experiment, corrosion boundary conditions of the model are confirmed according to a corrosion experiment result, and a corrosion-fracture phase field model is constructed, so that corrosion-induced strength attenuation, crack initiation and expansion paths can be accurately simulated; the method can be used for reliability evaluation, design optimization and service life prediction of SAC305 welding spots in electronic packaging, and provides a basis for engineering application of key interconnection parts in a corrosion environment.

The invention discloses a calculation method for adding an irregular sub-domain without a flux boundary condition in a computational domain, which comprises the following steps of: determining an irregular sub-domain of a substrate / impurity phase added in the computational domain, and drawing the irregular sub-domain into a substrate / impurity phase shape image; processing the image into data with a required model size; establishing a calculation equation of the calculation method coupled with the irregular sub-domain added with the flux-free boundary condition in the calculation domain; performing discrete difference on the calculation equation by adopting a finite difference method to obtain a discrete difference format equation; writing a phase field preposition program by applying a discrete difference format equation; importing the data into a phase field preposition program; taking an operation result of the phase field preposition program as an initial condition of a substrate / impurity phase, and importing the operation result into a constructed phase field model for describing a dendritic crystal growth process to obtain a calculation model coupled with the substrate / impurity phase with an irregular domain; a numerical solution of the calculation model is obtained through computer simulation. According to the invention, the operation efficiency and accuracy are improved.

The application discloses a multiphase flow interaction simulation method based on MPM and a phase field model, and comprises the following steps: step S1, storing mass parameters, phase field parameters and momentum parameters of Lagrange particles in an Euler grid; step S2, updating the phase field of the Euler grid according to the chemical potential to control the energy of the whole system; step S3, updating the momentum of the Euler grid according to gravity, elastic force and the surface tension of the updated equivalent phase field form; step S4, after the grid momentum is updated, processing the boundary on the Euler grid by using a slip boundary condition; step S5, after the phase field and the momentum are updated, converting the momentum parameters and the phase field parameters from the Euler grid variables to Lagrange variables; and step S6, updating the state of the Lagrange particles: updating the position and mass state of the Lagrange particles according to the information returned to the Lagrange particles.

The application discloses a kind of multi-scale simulation methods of vacuum self-consumption electric arc smelting process ingot, it is related to metal smelting technical field, including: based on the actual working condition parameters and material thermal physical parameters of vacuum self-consumption electric arc smelting, the three-dimensional geometric model of smelting area is established and function area is divided;Multi-physics field coupling numerical model is constructed in macroscopic simulation software, and simulation calculation result is obtained;Simulation result is input to mesoscopic simulation software through standardized data interface, as the initial condition and boundary condition of mesoscopic scale simulation, based on phase field model and solute diffusion equation, the grain growth morphology, solute distribution and microstructure evolution process are simulated;Crystal growth rate, solidification rate and solute distribution result are fed back to multi-physics field coupling numerical model, and iterative calculation is carried out, to realize the closed loop coupling of macroscopic and mesoscopic simulation.The application realizes the accurate control of ingot microstructure and performance.

The invention provides a phase field method for simulating copper grain microstructure evolution in a silicon through hole, and belongs to the technical field of electronic packaging. The problem that through-silicon-via copper grain microstructure evolution cannot be continuously tracked in the prior art is solved. The method comprises the following steps: constructing a phase field model of a TSV copper column polycrystalline system, and uniquely identifying crystal grains through non-conservation sequence parameters; establishing a free energy density function containing a local potential well and a gradient energy item; the free energy density function is substituted into the Allen-Cahn type kinetic equation; solving the Allen-Cahn type kinetic equation and visualizing order parameter evolution to obtain the space-time distribution of the TSV copper column crystal grain morphology and size; and performing thermal aging treatment on the TSV sample, performing electron back scattering diffraction representation on the cross section of the TSV sample subjected to thermal aging treatment, extracting grain size and orientation distribution data, and comparing the grain size and orientation distribution data with a phase field simulation result to calibrate phase field model parameters. The method is mainly used in the field of chip packaging.

The application discloses a kind of fatigue life simulation evaluation methods of new energy vehicle light weight aluminum alloy material, it is related to material life evaluation technical field;Microstructure image is collected and coupled feature is extracted by machine learning, complete heterogeneous data fusion and enhancement;Based on GAN generation topological optimization structure, in stress gradient dynamic grid, introduce VPSC model to describe anisotropy, construct dynamic finite element model;Fusion vehicle driving data, to LSTM prediction load, VMD decomposition and environmental correction, realize space-time correlation load spectrum reconstruction;Microscopically with phase-field model, macroscopically with XFEM crack tracking, bidirectional coupling transmission damage parameter, carry out multi-physical field coupling simulation;Bayesian inference is used to fuse simulation and test data, calculate life probability distribution, error is over limit when correcting parameter;The application ultimately reduces fatigue life prediction error, reduces the time consumption of single simulation, realizes life cycle assessment and visual early warning, provides efficient scheme for light weight design, promotes industrial technology upgrading.

The invention provides a grain microstructure prediction method based on a multi-scale fusion data model, and the method comprises the steps: constructing a SiC bulk phase structure model according to experimental data, and calculating the surface energy data of each surface structure; constructing a phase field model for grain orientation evolution in the SiC vapor deposition process; simulating the morphology evolution process of the SiC coating under different growth conditions to obtain a simulation result; thermodynamically calculating reaction substances based on a Gibbs free energy minimum principle to obtain a volume fraction of a reaction intermediate substance; constructing a database based on the experimental result, the simulation result and the volume fraction of the reaction intermediate substance, and interpolating feature missing values in the database; building a prediction model, and training the prediction model by using the database to obtain a trained prediction model; and predicting the growth process of the grain microstructure by using the prediction model. The technical problems that a large amount of experimental data is needed, the cost is high and the efficiency is low in the prior art are solved.

The present application relates to the field of structural fatigue fracture prediction and computational fracture mechanics, and particularly relates to a high-temperature notched fracture phase field life prediction method based on cyclic plastic zone calibration. In view of the fact that significant viscoplastic flow occurs at the root of the notch under high-temperature cyclic loading, and the fact that the value of the characteristic scale parameter in the existing fatigue phase field model lacks physical basis, leading to high sensitivity of life prediction to parameters, the method obtains the local stress-strain response at the root of the notch based on a unified viscoplastic cyclic constitutive model, quantifies the characteristic size of the inelastic process zone at the root of the notch by using the cyclic plastic zone theory, and establishes a quantitative mapping between the characteristic size and the regularization length of the fracture phase field to determine the characteristic scale of the phase field; in the finite element framework, the alternating iterative solution of the displacement field and the phase field variables is realized by coupling the UMAT and UEL user subroutines, so that the crack initiation, propagation and branching can be simulated without presetting the crack path, and the crack evolution process and fatigue life prediction results of the notched component under high-temperature working conditions are output.

The application provides a seawater freezing desalination cross-scale simulation method based on interface order parameter asymmetric correction, and belongs to the technical field of seawater desalination based on computer data processing; first, a sea ice-seawater two-phase microscopic molecular dynamics model is constructed, interface microscopic structure features are extracted, then a quantitative asymmetric correction function is constructed, a mesoscopic phase field model with asymmetric correction is established based on the quantitative asymmetric correction function, multi-physical field dynamic evolution is coupled and solved, finally, a cross-scale simulation model is generated and a prediction result is output; the application effectively solves the morphology distortion problem of a traditional phase field model when simulating high salinity crystallization, and provides a very reliable digital design tool for supercooling degree adjustment and refrigeration rate optimization in an actual seawater freezing desalination process.

This invention discloses a cross-scale simulation method for reactor nuclear materials that couples microstructure simulation with mechanothermal performance calculation. The method includes: a) planning the most optimal element sampling points using the minimum element method; b) simulating mechanothermal parameters using a mesoscale phase-field model; c) inputting the mechanothermal parameters into a finite element model to simulate mechanothermal performance; d) inputting the mechanothermal performance into a phase-field model to simulate the microstructure of the target nuclear material; e) obtaining a macroscale-mesoscale coupled model by iterating through steps c and d; f) obtaining a strongly coupled model through physical time axis control; and g) constructing a database of the relationship between mechanothermal parameters and mechanothermal performance using a data-driven neural network algorithm. This invention achieves strong coupling through parameter transfer between the mesoscale phase-field model and the macroscale finite element method, connects the macroscale and mesoscale using the minimum element method, and allows for parameter transfer accuracy adjustment based on convergence, enabling the prediction of the mechanothermal performance of novel reactor materials.

The invention discloses a composite material fracture energy calculation method considering reinforcement-matrix interface dispersion. The method comprises the following steps: S1, establishing a matrix internal crack fracture energy model; s2, establishing a reinforcement-matrix interface fracture energy model; s3, establishing a composite material fracture control equation model; s4, correcting the critical energy release rate of the composite material; and S5, performing finite element discretization on an interface phase field, a displacement field and a crack phase field in the composite material fracture control equation, performing increment iteration, and calculating the crack propagation condition in the composite material considering interface dispersion. By adopting the phase field model and utilizing the advantage that the phase field model can realize microcosmic-macroscopic multi-scale simulation, the interface attribute in the composite material is associated with the matrix attribute, that is, the fracture attributes such as interface crack propagation in the composite material under the load action are dispersed into the surrounding matrix in the form of a continuous exponential function; and a mechanical model for more accurately predicting the mechanical behavior and fracture evolution of the composite material is established.

The invention discloses a calculation method of an integral transformation fracture phase field model of an exponential cohesion law, and belongs to the technical field of finite element analysis of phase field models. The method comprises the following steps: deducing a cohesion eigenfunction of an index cohesion law by using a subprogram, deducing an analytical expression of an index energy density eigenfunction, and solving the expression of the index energy density eigenfunction and first two-order derivatives thereof by adopting multiple integral transformations, the Maclaurin series is adopted to determine an index energy density eigenfunction expression and an expansion expression of the first two-order derivatives at the zero point of the index energy density eigenfunction expression; and inputting the index energy density eigenfunction expression, the first two-order derivatives of the index energy density eigenfunction expression, and the expansion expression of the index energy density eigenfunction expression and the first two-order derivatives of the index energy density eigenfunction expression at the zero point into a solver for performing an integral transformation fracture phase field model to perform phase field model simulation calculation. According to the method, the simulation calculation of the exponential integral transformation fracture phase field model can be realized under a universal finite element framework, and the accuracy and the calculation efficiency are greatly improved.

The invention discloses a method for predicting the performance of a formed part of an additive manufacturing and rolling composite process, and belongs to the field of material performance characterization and prediction.The method comprises the steps that thermal response of a metal part to moving laser is simulated through modeling by means of a finite element method, and real-time temperature field data are obtained; establishing a temperature-dependent phase field model, and importing the additive parameters and the temperature field data output by the finite element method into the temperature-dependent phase field model to output microstructure data; establishing a rolling grain growth recrystallization model coupled with crystal plasticity and a phase field method by using the microstructure data; the grain size after recrystallization refining is output according to a grain growth recrystallization model of a phase field method; and predicting the performance of the formed part according to the grain size after recrystallization and refinement. According to the method, efficient prediction of the performance of the formed part is realized through accurate simulation of the grain size.

The invention relates to a dynamic evolution simulation method and system for an aluminum alloy high-solid-phase rheo-die-casting microstructure, and belongs to the technical field of aluminum alloy material solidification numerical simulation and calculation material science. The simulation method comprises the following steps: (1) establishing a rheo-die-casting whole-process model, and constructing a control equation set of a coupling phase field and a solute field by adopting a quantitative phase field model framework; a macroscopic temperature field is obtained through multi-scale parameters, thermodynamic parameters are coupled and called in real time, secondary alpha2-Al phase nucleation in the second-stage rheology die-casting forming process is simulated through a spontaneous nucleation calculation method, and numerical solution and visualization are conducted; (2) setting boundary conditions; (3) solving an equation; and (4) data processing. The invention also discloses a simulation system. According to the method, whole-process dynamic simulation is achieved for the first time, macroscopic-to-mesoscopic multi-scale thermodynamic multi-physics field accurate coupling is achieved, and the method is high in engineering applicability and suitable for binary alloy.

The invention discloses a concrete full-curve mechanical response-oriented numerical model parameter optimization method, which is applied to the technical field of phase field model solution parameter optimization calibration. Comprising the following steps: obtaining a simulation output result under a set phase field model solving parameter combination, and recording solving efficiency; calculating to obtain the fitting degree between each group of numerical simulation results and the test reference model and the corresponding solving efficiency; constructing a regression model by taking the model precision and the solving efficiency as target variables and taking each model solving parameter as an explanatory variable to obtain an approximate function expression of the fitting degree and the solving efficiency; and the global mechanical response curve is optimized and solved step by step according to the sequence of the fitting degrees. According to the method, on the basis of the fitting precision index, the solving efficiency is further introduced as a new optimization target, meanwhile, the optimization sequence is determined by combining the precision of the stress-strain behavior full-curve segmentation model, and system optimization of the concrete fracture phase field model solving parameters is achieved layer by layer and target by target.

The invention discloses a dead lithium mechanical property simulation analysis method and system based on a nonlinear phase field model. The method comprises the following steps that S1, a phase field variable control equation, a lithium ion concentration field control equation, a potential field control equation and a stress field control equation in the dendritic crystal growth process are obtained; s2, introducing a variable describing a local lithium metal active state to realize accurate capture of dynamic characterization and critical conditions; s3, collecting mechanical and electrochemical parameters of lithium and electrolyte and physical property parameters of the phase field model; and S4, importing the control equation and the physical property parameters into simulation software, constructing a geometric model, dividing grids, setting boundary conditions, initial values and solution parameters, and outputting a result in an image form after transient solution. The method can quantitatively characterize the distribution and evolution of the dead lithium and the peripheral stress, reveal the stress concentration phenomenon and the influence on the form of the dead lithium, and provide support for understanding the mechanical root of battery performance degradation and developing a strategy for inhibiting the formation of the dead lithium.