Mechanical property and fracture failure simulation modeling method for welded joint

A modeling method and technology of welded joints, applied in design optimization/simulation, special data processing applications, geometric CAD, etc., can solve the problems of low modeling accuracy and poor accuracy, so as to avoid model inaccuracy and improve modeling accuracy and the effect on the accuracy of the modeling

Pending Publication Date: 2020-08-11
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the deficiencies of the prior art, the present invention provides a simulation modeling method for mechanical properties and fracture failure of welded joints to solve the problems of low modeling precision and poor accuracy in traditional methods

Method used

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  • Mechanical property and fracture failure simulation modeling method for welded joint
  • Mechanical property and fracture failure simulation modeling method for welded joint
  • Mechanical property and fracture failure simulation modeling method for welded joint

Examples

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Embodiment 1

[0043] Taking the butt welding of 6061-T6 aluminum plate as an example, a simulation modeling method for mechanical properties of welded joints and fracture failure provided by the present invention includes:

[0044] 1. Prepare a welding sample, and obtain the temperature range of different areas on the welding sample during the welding process. The different areas are areas perpendicular to the length of the surface to be welded and parallel to the surface to be welded.

[0045] Since the welding heat-affected state of the aluminum plates on both sides of the butt joint weld is the same, it is only necessary to obtain the temperature range of different areas on one side of the aluminum plate during the welding process, and apply or weld a weld on the side of the aluminum plate (that is, the surface to be welded) , to simulate the thermal shock in the actual welding process, applying the weld on the side of the aluminum plate can be equivalent to the welding heat-affected stat...

Embodiment 2

[0077] Taking T-shaped welding of 6063-T6 aluminum alloy extrusion plate as an example as the welding material, a simulation modeling method for mechanical properties of welded joints and fracture failure provided by the present invention includes:

[0078] 1. Prepare a welding sample (the welding joint is a T-joint), and obtain the temperature range of different areas on the welding sample during the welding process. The different areas are along the direction perpendicular to the length of the weld (or the length of the surface to be welded) and parallel In the area of ​​the weld (or the surface to be welded).

[0079] The welding wire uses ER5356 aluminum alloy welding wire with a diameter of 1.2mm, the welding current is 130A, the arc voltage is 20V, and the welding speed is 60cm min -1 , the gas flow rate is 17L·min. The T-shaped welding sample is composed of a 300mm×150 rectangular wall plate and a 300mm×90mm rectangular rib plate. The welding direction of the welding s...

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Abstract

The invention discloses a mechanical property and fracture failure simulation modeling method for a welded joint. The method comprises the following steps of: before finite element modeling; firstly,determining the temperature change conditions of different areas in the welding process; slicing a weld template, performing testing to obtain material constitutive parameters of each tensile sample;during finite element modeling, applying material constitutive parameters of each tensile sample to each micro-area, so that different micro-regions have different mechanical property parameters, themechanical property of the micro-region of the welding joint is accurately described, the modeling precision and the modeling accuracy are greatly improved, and the problem that the model is inaccurate due to the fact that the whole welding joint adopts constitutive parameters of the same material is avoided.

Description

technical field [0001] The invention belongs to the technical field of metal material connection performance analysis, in particular to a metal material welded joint mechanical performance and fracture failure simulation modeling method. Background technique [0002] Welding is a very effective joining process that allows a permanent connection to be formed between the materials to be joined, usually by applying heat or pressure, or both, to form a welded joint. However, after the material is welded, the performance of each part of the joint is not uniform. The main reasons may be as follows: 1) The composition and performance of the filled welding wire material are inconsistent with the connected materials; 2) The heat-affected zone of welding is heated to different degrees. Different degrees of heat treatment will cause the microstructure after welding to change and be uneven; 3) For welding of dissimilar materials, there are differences in the composition and structure of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/17G06F30/23
CPCG06F30/23G06F30/17
Inventor 徐从昌李落星何洪
Owner HUNAN UNIV
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