Welding seam material parameter identification method

A technology of material parameters and weld area, applied in the direction of testing the hardness of materials and testing the strength of materials by applying stable tension/pressure.

Inactive Publication Date: 2014-12-03
HUNAN UNIV
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Problems solved by technology

However, the above methods have defects such as ignoring the influence of the heat-affected zone or difficult to determine the width of the weld

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  • Welding seam material parameter identification method

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Embodiment Construction

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] The present invention adopts material hardening model as power exponent material hardening model c=Kε n , the hardening model was proposed by Hollomon in 1944, where σ is the true stress, ε is the true strain, K is the strength coefficient, and n is the strain hardening exponent, which is an important mechanical index for judging the plasticity of materials and is used to describe the processing of materials hardened behavior. Experimental studies have shown that the hardening curves of many metals are similar to parabolic shapes. For annealed metals with cubic lattices (such as steel plates and aluminum alloys, etc.), they have parabolic tensile curves in the plastic deformation stage, and their hardening curves can be quite accurate. It is represented by Hollomon's power exponent hardening model. Therefore, according to the...

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Abstract

The invention discloses a method used for identifying parameter of a splicing welding plate welding seam material based on a DIC (density indicating controller) technology and a hardness test. The method comprises the following steps of: determining a material hardening model, and preparing a weld hardness testing piece; carrying out hardness test on the prepared testing piece, carrying out welding seam subsection according to the measured hardness value of the testing piece by the hardness test, and obtaining the hardness value of each region of the welding seam; preparing a splicing welding plate stretching test piece, carrying out subsection on the stretching test piece, adopting DIC equipment to obtain the real-time whole main and secondly strain values of each region of the stretching testing piece; calculating so as to obtain the material parameter of each region of the welding seam through a plasticity mechanical formula according to the obtained hardness value and the main and secondly strain values; establishing a stretching experiment finite element model, verifying the precision of the established finite element model and correcting; and inputting the obtained material parameter of each region of the welding seam through calculating into the finite element model, and verifying the accuracy of the detection method. The method disclosed by the invention utilizes the DIC technology and a hardness-testing device, combines finite element numerical simulation and experimental verification, provides a simple method used for exactly obtaining the static state material parameter of each region of the welding seam, and enlarges the application range of the DIC technology.

Description

technical field [0001] The invention relates to a method for identifying weld material parameters, in particular to a method for identifying weld material parameters of tailor welded blanks based on DIC technology and hardness test. Background technique [0002] Tailored welded blanks are several steel plates of different strengths and thicknesses welded into a whole plate to meet the different requirements of different parts for material properties. Its advantages are mainly reflected in reducing the weight of parts, reducing the number of parts and improving structural functions, etc. aspect. With the emphasis on environmental protection, resource conservation and sustainable development in modern society, tailor-welded blanks are more and more widely used in automobile manufacturing, and tailor-welded blank technology has become one of the most promising technologies in automobile manufacturing. [0003] In the process of welding metal sheets, due to the influence of hea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/40G01N3/18
Inventor 孙光永李光耀龚志辉付磊徐峰祥
Owner HUNAN UNIV
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