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Manufacturing method of three-dimensional axisymmetric smooth curved surface internal crack

A production method, axisymmetric technology, applied in the field of production of internal cracks in three-dimensional axisymmetric smooth surfaces, it can solve the difficulty of controlling the direction of fracture, the difficulty in the rate and direction of internal crack propagation, and the inability to produce crack samples in three-dimensional curved surfaces, etc. problem, to achieve the effect of simple operation and low cost

Active Publication Date: 2022-01-14
NANJING HYDRAULIC RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Second, the direction of the fracture is difficult to control
Third, it is more difficult to control the rate and direction of internal crack growth without going through the surface
[0004] The applicant proposed a method of making internal cracks in glass in the previous research CN107328625A, but this method can only make straight internal cracks, and the flatness of the cracks is taken as a feature, and it is impossible to produce three-dimensional curved surface internal crack samples. How to make cracks in three-dimensional curved surfaces has formed a technical threshold for crack research

Method used

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  • Manufacturing method of three-dimensional axisymmetric smooth curved surface internal crack
  • Manufacturing method of three-dimensional axisymmetric smooth curved surface internal crack
  • Manufacturing method of three-dimensional axisymmetric smooth curved surface internal crack

Examples

Experimental program
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Effect test

Embodiment 1

[0041] This example specifically illustrates the method of making inclined inner cracks in a glass cube sample. Among them, the glass cube sample is made of K5 glass or K9 glass, and the material of the triangular column block used must be exactly the same as that of the sample.

[0042] The method comprises the steps of:

[0043] S1: Design a layer of circular lattice in the plane where the central position of the glass cube sample is inclined to the upper and lower surfaces of the glass at a certain angle α, and record the three-dimensional coordinates of the lattice at each coordinate point. α≠0.

[0044] S2: According to the direction of the inclination angle of the crack in the desired product, calculate the incident direction of the laser, the placement angle of the triangular irregular spacer, and the relationship between the crack tip A and the top surface. The specific operation is as follows:

[0045] The layout of the device structure is as follows figure 2 As ...

Embodiment 2

[0054] This embodiment specifically illustrates the method of making curved surface internal cracks in the glass cube sample with inclined internal cracks produced in Example 1. (In this example, α=60°, the size of the glass cube sample is 40 mm×40 mm×100 mm, and the material is K9 glass)

[0055] S1: Put the prefabricated glass cube sample with inclined internal cracks into the oven, slowly raise the temperature in the oven to 105°C, control the heating rate of the oven at about 4°C / min, heat it to 105°C and keep it warm for 12 hours.

[0056] After heat treatment, the crack tip A close to the top surface bends in the direction opposite to the incident direction of the laser. The bending angle of point A is controlled by the α angle ( Figure 3-4 ).

[0057] S2: Stop the heat preservation, take the glass cube out of the oven and place it at room temperature until it is completely cooled, and observe that the internal oblique cracks have grown into cracks in a three-dimensio...

Embodiment 3

[0059] This example specifically illustrates the influence of different maximum temperatures on cracks in curved surfaces.

[0060] According to the method of Example 1, a glass cube sample of 40 mm × 40 mm × 100 mm was made, α = 60°, the diameter of the failure zone was 8 mm, and the diameter of the expansion ring was 20 mm.

[0061] According to the method of Example 2, the glass cube sample was heat-treated, and the temperature was raised to 70, 80, 90, 100, 110, and 120° C. at a heating rate of 2° C. / min and kept warm. The cracks in the curved surface at the maximum temperature of 120°C are as follows: Figure 5 As shown, it can be seen that as the inner crack propagates, the inclination angle α of the crack tip gradually decreases (crack propagation tends to be parallel to the upper and lower surfaces of the sample).

[0062] Invert the lower half curve by 180°C and compare it with the upper half curve, as shown in Figure 6 As shown in , it can be seen that the expande...

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Abstract

The invention relates to a manufacturing method of a three-dimensional axisymmetric smooth curved surface internal crack. The method comprises the following steps: in a glass cube sample, manufacturing an inclined symmetric internal crack positioned at the center position of the sample through laser and a triangular cylinder; and globally and uniformly heating the glass cube sample with the prefabricated inclined internal crack, uniformly heating to T according to a fixed heating rate during heating, cooling the glass cube sample to room temperature, and forming the three-dimensional symmetrical smooth curved surface internal crack in the glass cube sample. The manufacturing method of the three-dimensional symmetrical smooth curved surface crack is provided for the first time and has great milestone significance; when the method is used for manufacturing the curved surface internal crack, the bending direction, the bending degree and the expansion area of the newly-generated three-dimensional curved surface crack are controllable; and operation is easy and convenient, cost is low, and large-scale production can be achieved.

Description

technical field [0001] The invention belongs to the technical field of rock engineering damage prediction and safety, and in particular relates to a method for making internal cracks in an axisymmetric three-dimensional smooth curved surface. Background technique [0002] Rock is a typical brittle material with a large number of cracks inside. Under the action of load, the cracks expand and penetrate to form fractures, which are the main factors that cause earthquakes, underground caverns and slope instability. Rock is a three-dimensional space body, and the mechanical mechanism of its fracture and damage often exists inside. Internal cracks have a great influence on rock mechanical behavior, and even play a decisive role. Therefore, it is of great significance to carry out the research on internal cracks. In nature, there are not only straight inner fissures, but also three-dimensional curved inner fissures. However, so far, human beings have not been able to control the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N1/44
CPCG01N1/286G01N1/44G01N2001/2886
Inventor 王海军徐霁云汤雷陶冉冉任旭华潘文明
Owner NANJING HYDRAULIC RES INST
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