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Method for extracting fracture toughness of materials

A fracture toughness and indenter technology, applied in the field of material mechanical properties characterization, can solve problems such as low efficiency, high critical test load, and limited application

Inactive Publication Date: 2009-10-28
INST OF MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

The disadvantages of the Lawn-Anstis method and the Laugier method are: 1) the critical test load is high, which limits its application on micro-scale materials; 2) the elastic modulus E needs to be known
However, the Harding-Oliver-Pharr method needs to replace the indenter during the test, the test process is cumbersome and the efficiency is low

Method used

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  • Method for extracting fracture toughness of materials
  • Method for extracting fracture toughness of materials
  • Method for extracting fracture toughness of materials

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Embodiment Construction

[0039] Such as figure 1 , 2 , shown in 3, 4: the pressure head that the test method that the present invention proposes adopts is cube-corner pressure head, and the analytical parameter that adopts is: unloading work W u , loading work W t , the maximum head load F m , Radial crack length c,. Due to the use of the cube-corner indenter, the low critical test load is realized; because only the cube-corner indenter is used, the simplicity of the test is realized; the analytical parameter W that is easier to measure accurately is adopted u , W t , which ensures the reliability of the method. First, an instrumented indentation device equipped with a cube-corner indenter is used to perform an indentation test on the material to be tested. For the operation of the indentation test and the problems that should be paid attention to, please refer to the relevant instrumented indentation test standards [7] .

[0040] It should be emphasized that, for the present invention, only w...

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Abstract

The invention provides a method for extracting the fracture toughness of materials, which comprises the following steps of: 1) adopting cube-corner indenter to conduct indentation test on the materials; 2) obtaining unloading power, loading power and the maximal indenter load from a loading-unloading curve (F-h curve); 3) using microscopy observation technology for obtaining the size of radial crack on the surface of an unloaded sample; 4) testing the test result; and 5) bringing the parameters which simultaneously satisfy the testing result in step 4), namely the unloading power Wu, the loading power Wt, the maximal indenter load Fm and the radial crack length c into the formula: KIC=0.018(Wu / Wt)(Fm / c) and obtaining the fracture toughness KIC of the tested materials through calculation.

Description

technical field [0001] The invention relates to the field of characterization of mechanical properties of materials, in particular to a method for extracting fracture toughness of materials. Background technique [0002] As an important parameter of material catastrophe resistance, fracture toughness has always been one of the most concerned mechanical performance indicators in industrial material selection. However, traditional tests of the fracture toughness of extracted materials [1] , such as: three-point bending method, compact stretching method, etc., require a larger sample size and higher requirements for the sample preparation process. These factors make the traditional test for extracting fracture toughness very expensive, and some materials, such as most metallic glasses, simply cannot meet the requirements of the traditional test for sample size due to the limitation of the manufacturing process. [0003] The indentation test is a test method that uses a hard i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01B11/02
Inventor 张泰华冯义辉杨荣姜鹏
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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