Welding simulation method

A simulation method and technology of welded joints, applied in design optimization/simulation, special data processing applications, instruments, etc., can solve the problem of unbearable thermal elastic-plastic calculation time, difficult to predict thin plate bending, buckling instability of thick-walled structural mechanical behavior, etc. problem, to achieve the effect of breaking through the problems of efficiency and accuracy, improving the efficiency of solving, and the modular structure is easy to learn and operate.

Pending Publication Date: 2021-12-17
苏州喻云仿科技有限公司
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Problems solved by technology

[0004] The purpose of the present invention is to provide a welding simulation method, which has the advantages of breaking through the problem of both efficiency and precision of welding software, a pipelined GUI design, a modular structure that meets various needs, and is easy to learn and operate, and solves the problem that the inherent strain method only considers Partial components of residual strain, it is difficult to predict the limitations of thin plate bending, buckling instability and mechanical behavior of thick-walled structures, and the unbearable problem of overall thermoelastoplastic calculation time makes the solution efficiency increase by orders of magnitude

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Embodiment 1

[0036] The idea of ​​predicting stress and deformation of large-scale welded structures based on the calculation of local joint thermoelastoplasticity and overall structural elasticity; adaptive grid technology based on octree; thermoelastoplastic finite element analysis is performed on each local welded joint model to obtain the same Welding residual plastic strain information corresponding to each local welded joint model; import the welding residual plastic strain information into the pre-established full-process welding process model of structural parts, and calculate the full-process welding mechanical field of structural parts to obtain the full-process welding mechanical field of structural parts Process welding stress and deformation; according to the material parameters, environmental parameters and welding process parameters, the actual welding of the components to be welded is carried out to obtain the actual displacement and actual residual stress; the simulation mod...

Embodiment 2

[0038] In embodiment one, add following operation:

[0039]In step 1, in the stress-deformation simulation of welded structural parts, the error-controlled mathematical method of full-component mapping from local joint plastic strain to overall welded structure load is used, which significantly improves the solution efficiency and accuracy of large-scale structural parts; based on The concept of stress and deformation prediction of large welded structures based on thermoelastoplasticity of local joints and elastic calculation of the overall structure, a mapping error function based on the moment similarity between the joint and the overall structure is proposed, and an error-controlled local plastic strain to global load full component mapping iteration is created method. At the same time, the efficiency of the calculation process and the accuracy of the calculation results are improved.

[0040] The idea of ​​predicting stress and deformation of large-scale welded structures...

Embodiment 3

[0042] In embodiment two, add following operation:

[0043] In step 2, in the numerical simulation of the welding process, it is necessary to deal with physical behaviors such as molten pool flow, heat transfer, and free interface changes, which involve multi-phase and multi-field coupling, and the calculation is extremely time-consuming and inefficient. To this end, it is necessary to develop an efficient numerical calculation method; considering that the grid adaptive method is a key efficiency improvement method in the field of numerical calculation, this project proposes to develop an adaptive grid technology based on octree to speed up the discretization and solution The control equation of the welding process mathematical model greatly reduces the calculation time consumption. In the implementation, the key points include the discretization and solution of the mathematical model on the octree grid, and the high-precision and efficient control of grid self-adaptation.

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Abstract

The invention discloses a welding simulation method. The method comprises the following steps: a large welding structure stress deformation prediction thought based on local joint thermoelastoplasticity-overall structure elasticity calculation; an adaptive grid technology based on an octree; a step of performing thermal elastic-plastic finite element analysis on each local welding joint model to obtain welding residual plastic strain information corresponding to each local welding joint model; and a step of importing the welding residual plastic strain information into a pre-established structural part full-process welding process model. The invention aims to provide the welding simulation method, which has the advantages of breaking through the difficulty of considering the efficiency and the precision of welding software, realizing an assembly line type GUI design, meeting a modular structure of various requirements and being easy to learn and operate, solves the problems that an inherent strain method only considers partial components of residual strain and is difficult to predict sheet bending, buckling instability and mechanical behaviors of a thick-wall structure, and improves the solving efficiency by an order of magnitude.

Description

technical field [0001] The invention relates to the technical field of commercial welding, in particular to a welding simulation method. Background technique [0002] Welding process is widely used in aerospace, ships, rail vehicles, automobiles and other industries, and is the core key process of high-end and major equipment manufacturing in many countries. The welding structures of these industrial products (launch vehicles, cruise missiles, large passenger aircraft, aircraft carriers, high-speed trains, automobiles, etc.) usually have huge geometric dimensions and very complex shapes, and there are many processes and various production conditions. As the inherent products of the welding process, welding residual stress and welding deformation have an important impact on the service performance and safety of the structure. With the improvement of computer performance and the maturity of finite element technology, numerical simulation has become an important part of the stu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23G06F30/28G06F111/10G06F113/08G06F119/14
CPCG06F30/23G06F30/28G06F2113/08G06F2119/14G06F2111/10
Inventor 庞盛永
Owner 苏州喻云仿科技有限公司
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