A detection method for identifying static mechanical performance parameters of materials in different regions of welds

A technology of static mechanics and detection methods, applied in the direction of testing material hardness, etc., to achieve the effect of high practical value, widening the scope of use, and strong engineering significance

CN102288499AInactive Publication Date: 2011-12-21HUNAN UNIV
5 Cites 40 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2011-12-21
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention relates to a detection method for identifying static mechanical performance parameters of materials in different regions of a weld joint, which comprises the following steps of: (1) preparing a test piece of a weld joint indentation test; (2) selecting a plurality of points to carry out hardness test in the whole weld joint region of the test piece in the vertical weld joint direction and carrying out reasonable partitioning according to an obtained hardness value; (3) obtaining load-depth curves of different regions; (4) establishing an indentation test finite element model andcarrying out verification on the accuracy of the finite element model; (5) forming a target response function mathematical optimization model in different regions of the weld joint according to an analog result of the indentation test finite element model and a corresponding experimental result; and (6) combining an optimization genetic algorithm and carrying out iteration according to selected target response functions to obtain optimal solutions so as to obtain the static mechanical performance parameters in different regions of the weld joint. The detection method has simple principle and is convenient to operate. The local mechanical performance parameters of the materials in the range of millimeter even micrometer can be measured. The application range of the indentation test is expanded.
Need to check novelty before this filing date? Find Prior Art

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 weld seam 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, weld 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 were ignored in the previous research on this aspect, that is, the base metal was directly used in the finite element numerical modeling of the welding area. Nodal connection or rigid connection, it is obviou...

Examples

Embodiment Construction

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] Since the constitutive relationship of most engineering polycrystalline metal materials conforms to the power exponential relationship, that is, the hardening curve approximates a parabolic shape. Similarly, for engineering structures formed by a sharp annealing process of cubic lattice metals (steel plates and aluminum alloys, etc.) like welds, they also have a parabolic tensile change curve in the plastic deformation stage, so the calculation used in the embodiments of the present invention The elastoplastic constitutive model of the material is represented by the Hollomon power exponent hardening equation, as shown in formula (1):

[0030] σ = Kϵ n = σ y ϵ y n ...