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Introduction to the functions of Zirui CAE software

Zirui CAE software is a commercialized engineering software jointly developed by Zhengzhou Institute of machinery of the Ministry of machinery, Zhengzhou Zirui Software Co., Ltd. and the Institute of Computational Mathematics and Engineering Computing of the Chinese Academy of Sciences. It is the only general software in China that integrates seamlessly with upstream CAD software and has independent copyright. It has reached the international advanced level, with simple operation, convenient use and high degree of automation

Zirui CAE software is a highly automated general software system for finite element analysis, which is seamlessly integrated with 3D CAD software. It is suitable for structural design and analysis in all industries. It is especially suitable for machinery, automobile, construction, water conservancy, transportation, energy, aviation, aerospace, shipbuilding and other fields

the software has the functions of automatic mesh generation, automatic application of constraints and loads, automatic structural finite element analysis, and automatic post-processing of analysis results

* automatic mesh generation function of Zirui CAE software

Zirui CAE software can automatically mesh any 3D entity established by upstream CAD software. In particular, complex castings, machine shells, oddly shaped parts and components, and butt welding structures composed of steel plates of various thicknesses can realize automatic mesh generation. The unit size is automatically selected by the program according to a small amount of partition information provided by the user

Zirui CAE software can carry out fully automatic lattice division of multi-body composite structures made of different materials

the automatic mesh generation of Zirui CAE software can generate various elements such as rods, beams, plates and shells, blocks and high-precision blocks at one time

the automatic lattice division of Zirui CAE software also has the function of local lattice encryption

local encryption methods include column encryption, ball encryption and ring encryption

the combination of overall uniform dissection and local dense dissection can form a finite element lattice with dense lattice and reasonable transition

Zirui CAE software automatically judges the split entity: all defined local encrypted areas, regardless of their shape, are split with local dimensions

the column encryption method is suitable for the division around the hole, especially when the overall division size is larger than the hole radius

the spherical encryption method is suitable for corners with large stress distribution of parts and areas near the point of point load action

ring encryption is suitable for parts with complex intersecting lines or solid subdivision with hollow

various locally encrypted areas can be superimposed on each other. Zirui CAE software will automatically calculate the local partition size and transition ratio of the superposition part of various encrypted areas

The local encrypted area defined bymay not cover all the areas to be divided, but at least part of the areas to be divided must be covered

local lattice encryption is an internationally leading technical feature of Zirui CAE software. Skillfully using local encryption technology can make the dissection more reasonable, reduce the workload of dissection, analysis and post-processing, and improve the accuracy of analysis

* the load and constraint application function in Zirui CAE software

can directly apply physical force, surface force and point load on the 3D solid model in the upstream CAD software before dissection

physical strength includes body weight and centrifugal force

surface load is limited to the application of additive uniformly distributed load and normal linearly distributed load on the selected surface

point loads can be applied at points on the upper and surface

provides a variety of functions to apply point force. The force point can be the original vertex on the 3D solid, the point on the edge of the solid, the point can be selected on the curve defined by the user, or a surface of the solid can be selected as an auxiliary line, and then a point is defined on the auxiliary line, and finally a point force is applied. When the defined point is not exactly located in the solid, the point can be positioned by projection

when the point load is applied, the user needs to define a vector to determine the direction of the point force and enter the force value

after the sectioning is completed, you can choose to display the surface force and point force

the line load can be simulated through the point column of the curve. For example, the force on the bearing seat can be simplified to be loaded on a curve. At this time, several points of the curve can be used to simulate the non uniformly distributed line load

any place defined as a force point must be a node in the finite element lattice after automatic mesh generation

△ Zirui CAE software can directly impose face constraints, line constraints, and constraints on points on the line, points on the surface, or vertices on the 3D entities established in the upstream CAD software before grid division. You can choose to display constraints after the sectioning is completed

When△ line constraint, users can select the edge of 3D solid, or select it after defining the curve

△ Zirui CAE software can impose surface normal constraints and cylindrical constraints on 3D solids

* the finite element analysis function in Zirui CAE software

provides eight types of finite element analysis, namely linear static analysis, linear dynamic response analysis, linear frequency analysis (i.e. free vibration analysis), and linear buckling analysis; Nonlinear static analysis (including material nonlinearity and geometric nonlinearity); Nonlinear dynamic response analysis (including material nonlinearity and geometric nonlinearity); Steady state temperature field analysis and thermal stress analysis

linear static analysis

linear static analysis is linear elastic analysis. Through linear static analysis, various components and synthetic quantities of displacement and stress of the structure can be obtained

the algorithms used in linear static analysis are general direct method and fast direct method. It is the latest research achievement of Zirui software company. It runs faster than similar algorithms in common commodity software

Zirui CAE provides a domestic material library for static analysis, and users can also define the required materials by themselves

after the grid is automatically divided, the user clicks the "start solving" item with the mouse, and the program will automatically solve and analyze. After the solution is completed, the time information of the beginning and end of the solution will be displayed on the interface, and then the user can select the "post-processing" item in the main menu to observe the results

linear dynamic response analysis

linear dynamic response analysis is to calculate the dynamic response of the structure when the deformation and stress are within the elastic range under dynamic load, that is, to calculate the mechanical quantities such as displacement, velocity, acceleration, stress and strain that change with time. The main difference between it and linear static analysis is that the dynamic load changes with time, and the influence of inertia force and damping should be considered

linear dynamic analysis can be solved by modal superposition method and direct integration method, and the direct integration method can be divided into explicit and implicit time integration

when using the linear dynamic analysis function, users must first establish an analysis model in the upstream CAD (or call the three-dimensional model approved by the upstream CAD), then define the job name, define the "time function" of the load changing with time, select materials, define initial conditions, define damping, select analysis methods, and define loads and constraints. Then, the same method and steps as linear static analysis can be used for automatic mesh generation, encryption and solution

linear frequency analysis

linear frequency analysis is to solve the natural frequency and its corresponding mode (or vibration mode) of the free vibration of the structure. Determinant search method and subspace iteration method can be used in frequency analysis. It can solve several user-defined low-order frequencies and corresponding modes calculated from the minimum frequency of the structure; It can also solve the frequency and its corresponding mode in a certain frequency range

when users use the linear frequency analysis function, all operations are basically the same as linear static analysis; It's just that there is no need to load at this time

linear buckling analysis

linear buckling analysis is to solve the critical load when the structure loses stability under given constraints and forces. Buckling analysis, like free vibration, is also the solution of eigenvalue problem. Of course, not all mechanical models can be used for buckling analysis, and certain conditions must be met

the critical load factor and buckling mode are directly obtained by Zirui CAE software. The critical load factor multiplied by the applied load is the critical load of the structure

nonlinear static analysis

nonlinear static analysis refers to that under the static load, the stress of the structure exceeds the yield limit of the material (that is, the nonlinear relationship between stress and strain), or the deformation exceeds a certain degree, and the nonlinear relationship between strain and displacement, the former is called material nonlinearity; The latter is called geometric nonlinearity

for material nonlinearity, Zirui CAE software provides a variety of commonly used material models to simulate nonlinearity, Namely:

linear elastic material mode

thermoelastic material mode

elastoplastic isotropic strengthening bilinear material mode

elastoplastic isotropic strengthening multi-stage linear material mode

elastoplastic follow-up strengthening bilinear material mode

elastoplastic follow-up strengthening multi-stage linear material mode

thermal elastoplastic creep material mode

geometric nonlinearity, It is usually divided into large displacement and small strain and large displacement and large strain

in static analysis, when material nonlinearity and geometric nonlinearity occur at the same time, or both occur, it constitutes a nonlinear static analysis. Therefore, the linear elastic material model is also included in the nonlinear static analysis model

in nonlinear static analysis, after the material enters nonlinearity, it is generally necessary to apply the load step by step in several times and solve it according to the incremental theory. Therefore, nonlinear analysis requires a balanced iteration of the nonlinear algebraic equations at each incremental step to meet the balance at each incremental step

Zirui CAE software provides:

complete Newton iteration method

modified Newton iteration method

BFGS iteration method

and other iterative methods to solve nonlinear algebraic equations

in addition, the convergence criteria of equilibrium iteration also have room for choice. They are:

force/moment convergence criteria

displacement/rotation convergence criteria

energy convergence criteria

nonlinear analysis function in Zirui CAE also provides

overall Lagrange formula, which is applicable to geometric nonlinear problems of large displacement and small strain linear materials and elastoplastic materials

updated Lagrange formula, which is suitable for elastoplastic deformation analysis with large displacement and large strain

when using Zirui CAE for nonlinear static analysis, before automatic dissection, users need to activate the interface of nonlinear analysis, select (or define) materials, define time functions (i.e. the increment of load in each time step), define constraints, select the solution method, and after the convergence criteria, automatic dissection can be carried out. The next steps are the same as other analysis types

in the use of data differences to a minimum

nonlinear dynamic analysis

nonlinear dynamic analysis refers to the material nonlinear and geometric nonlinear analysis of the structure under the dynamic load varying with time, or only material nonlinear or only geometric nonlinear analysis. As it is a dynamic analysis, the influence of inertia force and damping needs to be considered. In the nonlinear dynamic analysis, the step-by-step integration method is used to calculate the dynamic response of the structure at each time step; Because it is a nonlinear problem, the nonlinear equations must be balanced and iterated at each time step. The iterative method and convergence criteria are the same as those of nonlinear static analysis

user's operation steps when using Zirui CAE for nonlinear dynamic analysis and nonlinear static analysis

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