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Metal lattice interlayer plate with embedded defects and mechanical property detection method thereof

A metal lattice, prefabricated defect technology, applied in the direction of using stable tension/pressure to test material strength, measuring device, strength characteristics, etc., can solve the problems of high preparation cost, unfavorable promotion and application, complex preparation process and so on

Inactive Publication Date: 2016-11-16
INST OF MECHANICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the common preparation methods of lattice materials include investment casting method, weaving method and stamping and folding method. However, these methods are either complicated in preparation process, high in preparation cost, or only applicable to a few kinds of metal lattice materials. preparation, which is not conducive to popularization and application

Method used

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  • Metal lattice interlayer plate with embedded defects and mechanical property detection method thereof
  • Metal lattice interlayer plate with embedded defects and mechanical property detection method thereof
  • Metal lattice interlayer plate with embedded defects and mechanical property detection method thereof

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0035] The mechanical properties of the above four metal lattice sandwich panels with welding defects and panel perforation defects were tested respectively, and the dimensions of the four sample panels were all 250×250×7.8mm. They are:

[0036] D1. Single row lack of soldering, D2. The center contains 6×11 solder joints missing solder; D3: The center contains 4×7 solder joints missing solder; D4: The panel is perforated. The schematic diagram of the four samples is as follows figure 2 shown.

[0037] A 100-ton hydraulic universal material testing machine of the model WE-1000B is used to conduct compression tests on metal lattice sandwich panels with prefabricated defects. In-plane pressure is applied on both sides of the lattice sandwich panels. The loading form is displacement loading, and the loading rate is 2mm. / min. According to the load read by the material testing machine, the load-displacement curve under the in-plane compression condition can be obtained. At the ...

experiment example 2

[0042] Examination of the effect of defects containing missing cells on the natural frequencies of metal lattice sandwich structures:

[0043] During the excitation process, a three-dimensional laser vibrometer is used to test the natural frequency of the lattice metal sandwich plate structure with cell missing defects, where A00 represents a intact lattice sandwich plate, and SD1 represents a lattice with 2×3 cell missing defects Sandwich plate specimens, SD2 represents lattice sandwich plate specimens with 3×4 cell deletions, SD3 represents lattice sandwich plate specimens with 4×5 cell deletions. The result statistics are shown in Table 1:

[0044] Table 1

[0045]

[0046]

[0047]It can be seen from Table 1 that the absence of cells will have a great influence on the natural frequency of the lattice sandwich structure. When the cell missing rate reaches 1.7%, the first-order natural frequency of the lattice sandwich plate specimen decreases by 15.5%, and when the ...

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Abstract

The invention discloses a metal lattice interlayer plate with embedded defects and a mechanical property detection method thereof. The preparation process is simple, low in cost and applicable to preparation of various metal lattice materials. By means of the mechanical property detection method, the mechanical property of the metal lattice interlayer plate with the embedded defects can be comprehensively detected. The method comprises the steps that 1, a wire mesh of a two-dimensional planar structure of a periodic rhombus structure is stamped at joints to obtain a lattice material with a three-dimensional pyramid structure; 2, defects are embedded on the lattice material or metal panels, the lattice material is used as a core material to be arranged between the two metal panels in an overlaid mode, the lattice material and the two metal panels are brazed at a high temperature after being overlapped, and the metal lattice interlayer plate with the embedded defects is obtained. The defect embedding process comprises the steps that some joints of the lattice material are coated with protective materials, partial metal lattice sandwich is cut away, or one metal panel is punched.

Description

technical field [0001] The invention relates to a metal lattice interlayer board containing prefabricated defects and a method for detecting its mechanical properties. Background technique [0002] Lattice materials are composed of three-dimensional micro-truss structures, and have attracted extensive attention from domestic and foreign researchers since they were proposed. The metal lattice sandwich panel structure composed of two layers of metal sheets with large heights and a lattice sandwich core is widely used in aerospace thermal protection structures due to its high specific stiffness, specific strength, versatility and designability. The field of lightweight design has broad application prospects. [0003] However, due to the immaturity of the preparation process and the complexity of the structure itself, the lattice sandwich panel is prone to local defects such as missing solder joints, missing cells, and panel perforation. The research shows that the number and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/12G01N1/28B21C37/02
CPCB21C37/02G01N1/286G01N3/12G01N2203/0048G01N2203/0282
Inventor 宋宏伟袁武路玲玲黄晨光
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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