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A test method for interface fracture toughness of second-generation high-temperature superconducting strips

A technology of high-temperature superconducting strips and fracture toughness, which is applied in the preparation of test samples, the use of stable bending force to test the strength of materials, and the use of stable tension/pressure to test the strength of materials, etc., which can solve difficult test and influence Strip use and other issues, to achieve the effect of easy implementation, ensure the accuracy of the experiment, and simple measurement methods

Active Publication Date: 2021-08-03
LANZHOU UNIVERSITY
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Problems solved by technology

[0002] The second-generation high-temperature superconducting tape is a typical laminated composite material, and interlayer delamination often occurs, which seriously affects the use of the tape.
In addition, due to the thinness of the superconducting tape, it is difficult to test it with the traditional method of testing the interface fracture toughness of composite materials

Method used

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  • A test method for interface fracture toughness of second-generation high-temperature superconducting strips
  • A test method for interface fracture toughness of second-generation high-temperature superconducting strips
  • A test method for interface fracture toughness of second-generation high-temperature superconducting strips

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Embodiment Construction

[0025] The solutions of the present invention will be further described below in conjunction with specific examples.

[0026] A method for testing the interface fracture toughness of a second-generation high-temperature superconducting strip, comprising the following steps:

[0027] (1) if figure 1 As shown, on both sides of the superconducting strip 1, the solidified thickness is much larger than its reinforcing layer 2, forming a composite beam structure and as a sample to be tested. 30 times, and the reinforcing layer 2 on both sides of the superconducting strip 1 has the same thickness, and the length of the reinforcing layer 2 is the same as that of the superconducting strip 1; the material of the reinforcing layer 2 can be selected from epoxy resin, oxygen-free copper or stainless steel, and High-strength glue can be used for bonding and curing. When oxygen-free copper or stainless steel is selected as the reinforcement layer, special solder for superconducting material...

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Abstract

The invention provides a second-generation high-temperature superconducting strip interface fracture toughness test method, which includes the following steps: (1) solidifying a reinforcing layer with a thickness much larger than that on both sides of the superconducting strip to form a composite beam structure and serve as a Test sample; (2) Coat the speckle on the narrow side of the sample length direction; (3) Cut the initial crack at one end of the sample superconducting strip, then load the sample on the tensile machine, and the CCD Aim the camera at the speckle-coated side of the sample; (4) Carry out Type I and Type II interlaminar fracture experiments respectively; (5) Use the digital image correlation method to calculate the Type I and Type II interlaminar fractures of the sample Toughness, the result is the type I and type II interlaminar fracture toughness of the superconducting tape. In the present invention, by adding a reinforcing layer with a thickness much larger than the superconducting strip on both sides of the superconducting strip, the fracture toughness of the superconducting strip can be measured by a conventional experimental method, and the experimental method is simple and has high accuracy.

Description

technical field [0001] The invention belongs to the technical field of superconducting strip experiments, and relates to a second-generation high-temperature superconducting strip interface fracture toughness test method. Background technique [0002] The second-generation high-temperature superconducting tape is a typical laminated composite material, and the interface peeling between layers often occurs, which seriously affects the use of the tape. Since the thickness of the second-generation high-temperature superconducting strip is very thin (thickness is about 0.1 mm), and it has an asymmetric structure along the thickness direction of the material, such structural features make it difficult to capture the deformation characteristics of superconducting materials, especially the crack tip during deformation. . In addition, because the superconducting tape is very thin, it is difficult to test it with the traditional method of testing the interface fracture toughness of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08G01N3/20G01N3/06G01N1/28
Inventor 高配峰王淑丹耿鑫关明智王省哲
Owner LANZHOU UNIVERSITY
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