Micro-analysis method applied to rock material I type crack initiation and expansion process

A technology for microscopic analysis and expansion process, applied in special data processing applications, instruments, electrical digital data processing, etc., to achieve the effect of intuitive simulation results and clear concepts

Active Publication Date: 2018-03-23
HOHAI UNIV
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Problems solved by technology

At present, there are no research results in China that use molecular dynamics theory to analyze and control the mechanism of crack initiation and propagation of rock materials. Therefore, it is of great significance to es...

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  • Micro-analysis method applied to rock material I type crack initiation and expansion process
  • Micro-analysis method applied to rock material I type crack initiation and expansion process
  • Micro-analysis method applied to rock material I type crack initiation and expansion process

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Embodiment Construction

[0038] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0039] A microscopic analysis method applied to the initiation and propagation of type I cracks in rock materials. Based on silica, the molecular dynamics numerical simulation of the initiation and propagation of microcracks is established, and different ensembles, different temperatures, and different loading rates are analyzed. , The effect of different force loading or different thickness of the cracked plate on the crack propagation process. Based on the LAMMP open platform, the response program was compiled. A new method for analyzing the microcrack propagation process of rock materials under tension is formed based on molecular dynamics simulation technology.

[0040] Concrete analysis process of the present invention is as follows:

[0041] For rock-based silica (SiO 2 ) Based on the LAMMP open source software platform, the program w...

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Abstract

The invention discloses a micro-analysis method applied to the rock material I type crack initiation and expansion process. The method comprises the following steps that 1, a micro model for SiO2 crack initiation is built; 2, the working condition is set, and the crack expansion process is simulated and analyzed, and the average stress and the total crack length of the area at one end of a crack are calculated; 3, a crack stress intensity factor is calculated; 4, crack initiation driving force is calculated; 5, a calculation method of the average speed of microscopic crack expansion is built;6, influence rules of different conditions to the crack initiation and expansion process are analyzed. The method has the advantages that it is first put forward that molecular dynamics is adopted forsimulating the rock material microcrack initiation and expansion process, the stress intensity factor calculation method under microscopic molecular dynamics simulation and crack expansion speed calculation method in microscopic simulation are built, and a theoretical basis is provided for deeply analyzing the whole microcrack expansion process such as rock brittle fracture and creep and mechanism study.

Description

technical field [0001] The invention relates to a microscopic analysis method for crack initiation and propagation process, in particular to a microscopic analysis method for type I crack initiation and propagation process of rock materials. Background technique [0002] The failure process of rock is the core technology of safety control in rock engineering, and the mechanism and control of micro-crack propagation in rock has become a frontier hot issue in rock engineering research. Because the microcrack initiation mechanism of rock is not clear, it brings great confusion to rock engineering workers. Rock is a porous medium, but its skeleton components are solid materials, many of which are composed of crystals, among which silicon dioxide is a typical molecular component. Studying the fracture process of crystals is one of the key technologies for studying the initiation and propagation of microcracks . It is also the basis for a better understanding of brittle fracture...

Claims

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Application Information

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IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 沈才华谢飞李雪松陈达
Owner HOHAI UNIV
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