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Detecting method for identifying dynamic mechanical property parameters of materials in different zones of welding spot

A technology of dynamic mechanics and detection methods, applied in the direction of testing the hardness of materials, etc., can solve the problems of difficulty in determining the initial cross-sectional area A0 of each area to be measured, and the inability to directly fit dynamic mechanical performance parameters, so as to broaden the scope of use and strengthen engineering. Use value, high practical value effect

Inactive Publication Date: 2013-05-29
HUNAN UNIV
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Problems solved by technology

However, when identifying and detecting material dynamic performance parameters such as solder joints that have non-uniform material properties in each area, the initial cross-sectional area A of each area to be tested 0 It is difficult to determine, therefore, the stress-strain relationship cannot be directly obtained according to the basic equation of the appeal through the dynamic indentation test, and the dynamic mechanical performance parameters of this area cannot be directly fitted

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  • Detecting method for identifying dynamic mechanical property parameters of materials in different zones of welding spot
  • Detecting method for identifying dynamic mechanical property parameters of materials in different zones of welding spot
  • Detecting method for identifying dynamic mechanical property parameters of materials in different zones of welding spot

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Embodiment Construction

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] Because the deformation of most engineering polycrystalline metal materials under the action of impact load is often simulated by using the most extensive Johnson Cook strengthening model, so the present invention adopts this model as the constitutive relation of this embodiment, as shown in formula (1), It can be seen from the formula that the J-C model is expressed as the product of three terms, which respectively reflect strain hardening, strain rate hardening and temperature softening (note: the modified form of the J-C model is used here).

[0031] σ = ( A + B ϵ n ) [ 1 + CIn ( 1 + ...

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Abstract

The invention discloses a detecting method for identifying dynamic mechanical property parameters of materials in different zones of a welding spot, comprising the following steps: (1) preparing a welding spot specimen for hardness test; (2) selecting a plurality of spots for hardness test in the entire welding spot zone in the diameter direction of welding spot test, and dividing zones accordingto hardness values; (3) carrying out dynamic indentation test in the divided zones to obtain a load depth curve of different test points; (4) establishing a finite element model of the indentation test and verifying; (5) constructing optimized mathematical models at different zones of the welding spot according to a simulated result of the finite element model of the indentation test and a corresponding test result; and (6) solving the optimized mathematical models in the step (5) by adopting an overall optimization algorithm to obtain dynamic mechanical property parameters of different zonesof the welding spot. The detecting method is simple in principle, convenient to operate and is capable of measuring the local dynamic mechanical property parameters of materials within the range of millimeter and even micrometer sizes. In addition, the application range of the indentation test is widened.

Description

technical field [0001] The invention mainly relates to the field of material detection in mechanical engineering manufacturing, in particular to a method for detecting mechanical property parameters of materials in solder joint regions. Background technique [0002] In the process of welding metal sheets, due to the influence of resistance heat, the material properties of the welding area will change, which makes the performance of this area different from that of the base material. According to the characteristics of hardness, the welding area can be divided into three sub-areas: Base metal zone, heat affected zone, solder joint zone. Since the size of the base metal is generally large enough compared with the heat-affected zone, the material properties of the heat-affected zone have been ignored in previous studies, that is, the common node connection is often used in the finite element numerical modeling of the welding zone It is obvious that the material properties at t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/40
Inventor 孙光永李光耀徐峰祥付磊
Owner HUNAN UNIV
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