Method for determining length of fracture process region of rock-like material

A technology of fracture process and determination method, which is applied in the direction of analyzing materials, using a stable bending force to test the strength and strength characteristics of materials, etc., to avoid dependence and determine the method accurately.

Inactive Publication Date: 2020-01-24
ZHONGBEI UNIV
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Problems solved by technology

There is a certain error between the acoustic emission positioning results and the actual length of the process area

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  • Method for determining length of fracture process region of rock-like material
  • Method for determining length of fracture process region of rock-like material
  • Method for determining length of fracture process region of rock-like material

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Embodiment Construction

[0036] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0037] The present invention selects the naturally cooled granite after being heated to 200°C as the experimental sample, and determines the length of the process area based on the virtual crack model. The virtual crack model is as follows: figure 1 As shown, the specific steps are as follows:

[0038]1) Processing samples. Process the rock sample into a cuboid sample of 20 × 40 × 180 mm, and use a diamond wire with a diameter of 1 mm to cut the prefabricated cracks, such as figure 2 shown. After the sample is processed, it is heated to 200 °C at a heating rate...

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Abstract

The invention relates to a method for determining the length of a fracture process region of a rock-like material, and belongs to the technical field of rock mechanics and engineering. On the theoretical basis of a virtual crack model, displacement field data within the vicinity of the fracture process region are obtained by a digital speckle correlation method DIC, and the position of a tip of the process region is judged by using the Laida criterion to calculate the length of the fracture process region. The method for determining the fracture process region is more accurate, and the dependence on the data processing experience when determining the position of the tip of the process region is avoided.

Description

technical field [0001] The invention relates to a method for determining the length of a fracture process region of a rock material, belonging to the technical field of rock mechanics and engineering. Background technique [0002] When rock materials (especially rock materials subjected to high temperature) fracture, there is a significant nonlinear (plastic) region at the crack tip, called the fracture process zone (FPZ), which violates the basic assumption of linear elastic fracture mechanics (LEFM) , the study of fracture characteristics should adopt the method of nonlinear fracture mechanics. The proposed virtual fracture model provides a way for the study of nonlinear fracture characteristics. The model divides the fracture region into two parts: real physical fracture and virtual fracture (FPZ). The length of the process zone and the expansion process are important parameters reflecting the fracture resistance of the material. [0003] The determination of the length...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/20G01B11/03
CPCG01B11/03G01N3/20G01N2203/0003G01N2203/0023G01N2203/0067G01N2203/0641G01N2203/0647G01N2203/0682
Inventor 武晋文王学怀赵晓杰耿少波郑利锋陈淑萍高经武
Owner ZHONGBEI UNIV
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