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Size optimization method for welded joint

A technology for welding joints and size optimization, applied in design optimization/simulation, instruments, manufacturing computing systems, etc., can solve problems such as error-prone, high computational cost, inaccurate evaluation results, etc., to improve fatigue characteristics and improve fatigue resistance. , The effect of improving the quality of welding products

Active Publication Date: 2020-12-29
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0011] In order to solve the problems of inaccurate evaluation results, high calculation costs and low efficiency caused by relying on engineering experience and fatigue testing, the present invention proposes a method for optimizing the size of welded joints
Compilation of finite element modeling guidelines for welded structures for size optimization design, through which the finite element model of welded joints can be established to correctly perform mechanical analysis of welded joints, effectively solving the problem of relatively complicated and easy finite element modeling of welded structures wrong question

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  • Size optimization method for welded joint

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Embodiment Construction

[0069] A method for optimizing the size of a welded joint proposed by the present invention, such as Figure 4 As shown in the flow chart:

[0070] (1) Build an initial proxy model for implicit problems in finite element analysis of welded structures;

[0071] (2) Create the initial sample space of the design parameters of the welded joint size;

[0072] (3) According to the "Finite Element Modeling Guidelines for Welded Structures", use the sample space to create an analysis model;

[0073] (4) Use the "Efficient Calculation of Structural Stress and Evaluation Method of Fatigue Characteristics" to calculate the evaluation target;

[0074] (5) Substitute the initial sample space of the size design parameters and the obtained evaluation target response into the initial proxy model, and update the proxy model;

[0075] (6) Judging whether the accuracy of the agent model meets the self-learning and optimization capabilities, if not, go to the next step, if it is, skip to step ...

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Abstract

The invention relates to a size optimization method of a welded joint, which comprises the following steps of: firstly, compiling a finite element modeling criterion of a welded structure suitable forsize optimization design, and establishing a finite element model of the welded joint through the modeling criterion so as to correctly carry out mechanical analysis on the welded joint; secondly, simplifying and integrating an efficient calculation method for obtaining the structural stress of the welded joint by extracting unit node force, and using the structural stress obtained through the calculation method for correctly evaluating the fatigue life of the welded joint; and finally, creating the welding joint size optimization method with the structural fatigue characteristics as the evaluation target, and effectively improving the fatigue characteristics of the welding joint through the welding joint size parameters obtained through the optimization method.

Description

technical field [0001] The invention belongs to the technical field of welding technology, and relates to a method for optimizing the size of a welded joint, which optimizes the size of the welded joint based on numerical simulation technology, improves the fatigue resistance of the welded joint, effectively analyzes the mechanical properties, and improves the quality of welded products. Background technique [0002] Welding is an important process for the processing and assembly of typical structural parts of ships, pipelines and pressure vessels. It plays a very important role in industrial production, heavy equipment and civil life. At present, welded structures produced by major industrial countries in the world account for 50% to 60% of steel output. With the development of manufacturing technology, in the field of advanced manufacturing technology, more and more attention has been paid to the strength research and fatigue fracture research of welded structures, in ord...

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Application Information

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IPC IPC(8): G06F30/17G06F30/23G06F111/10G06F119/04G06F119/14
CPCG06F30/17G06F30/23G06F2111/10G06F2119/04G06F2119/14Y02P90/30
Inventor 段成凯霍世慧刘永寿宋亚丽周柏承彭昊杨欣
Owner NORTHWESTERN POLYTECHNICAL UNIV
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