Finite element modeling method of dynamic birth and death unit in welding numerical simulation
A life-and-death unit, numerical simulation technology, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of complex programming and low accuracy of temperature field calculation results, and achieve the effect of avoiding programming
Active Publication Date: 2017-08-04
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology
[0004] In view of the above problems, the purpose of the present invention is to provide a finite element modeling method for dynamic life-death elements in welding numerical simulation, to solve the problems of complicated programming and low accuracy of temperature field calculation results in existing welding finite element analysis
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[0019] The finite element modeling method of the dynamic life-death unit in the welding numerical simulation provided by the present invention comprises the following steps:
[0020] Step 1: Establish a three-dimensional solid model of the welded structure, and divide the three-dimensional solid model into a base metal area and at least one weld area according to the welding material.
[0021] The three-dimensional solid model of the welded structure is established by three-dimensional software.
[0022] After the three-dimensional solid model is divided into the base metal area and at least one weld area, the base metal area and the weld area are stored in the STP general data format.
[0023] Step 2: Perform geometric cleaning on the 3D solid model, and create the base metal area and the weld area as a new layer or set.
[0024] The files in the STP general data format are read in through the HyperMesh software, and the geometry of the 3D solid model is cleaned up.
[0025...
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The invention provides a finite element modeling method of a dynamic birth and death unit in a welding numerical simulation. The method comprises the following steps that 1, a three dimensional solid model of a welding structure is built, and according to welding materials, the three dimensional solid model is divided into a base material zone and at least one weld zone; 2, geometry cleaning of the three dimensional solid model is conducted, and the base material zone and the weld zone are created as a new layer or a new set; 3, the base material zone is divided into a volume mesh and stored in the layer or the set which the base material zone is located on; a surface cell is built in the weld zone and stored in the layer or the set which the weld zone is located on; 4, a weld unit is defined, and a weld finite element analytical model is generated; 5, a material property, a physical property of a unit and a analysis step number are defined; 6, the dynamic birth and death unit of metal in the weld zone is defined, and modeling is completed. According to the method, the process that the weld metal is dynamically filled with a welding process and a new heat exchange surface and an old heat exchange surface are dynamically transformed can be simulated accurately, and the precision of welding numerical calculation is improved.
Description
technical field [0001] The invention relates to the technical field of finite element analysis of welding numerical simulation, and more specifically, relates to a finite element modeling method of dynamic life-death elements in welding numerical simulation. Background technique [0002] "Birth and death element" is a commonly used simulation method in the field of modern welding numerical simulation. Its function is to dynamically fill the weld with the welding seam element during the welding finite element calculation process, which is consistent with the actual welding process to obtain the same value as the actual welding process. The matching temperature field improves the accuracy of numerical simulation. Python is the secondary development language of large-scale general-purpose ABAQUS software, which can integrate modeling and calculation of ABAQUS, especially in the field of welding, it is necessary to use Python secondary development to define the "life and death u...
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Login to View More IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 尹立孟刘成王刚姚宗湘夏文堂尹建国
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY