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Pretreatment method for near-field kinetic model containing three-dimensional initial crack surface

A dynamic model and initial crack technology, applied in image data processing, electrical digital data processing, 3D modeling, etc., can solve problems such as lack of characterization means

Pending Publication Date: 2022-07-12
POWERCHINA HUADONG ENG COPORATION LTD
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Problems solved by technology

However, for the three-dimensional crack growth problem, especially the three-dimensional problem with the initial crack surface, there is still a lack of reliable and effective characterization methods

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  • Pretreatment method for near-field kinetic model containing three-dimensional initial crack surface
  • Pretreatment method for near-field kinetic model containing three-dimensional initial crack surface
  • Pretreatment method for near-field kinetic model containing three-dimensional initial crack surface

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Embodiment Construction

[0069] The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

[0070] The present invention provides a preprocessing method for a peri-dynamic model containing a three-dimensional initial crack surface, and the specific implementation steps are as follows:

[0071] (1) Discrete the calculation model into a series of nodes with material physical and mechanical information, and store the coordinates, volume and other information of the nodes separately.

[0072] (2) Determine the radius δ of the node support domain (usually three times the node spacing), and search for other node information within the node support domain. For this step, it can be calculated by the kdtree / rangesearch function of the binary tree algorithm.

[0073] (3) Determine the spatial coordinates of the bounded plane representing the three-dimensional crack; for complex three-dimensional cracks, it can be divided into several plane t...

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Abstract

The invention provides a pretreatment method for a near-field dynamic model containing a three-dimensional initial crack surface, which comprises the following steps of: (1) dispersing a calculation model into a series of nodes with physical and mechanical information of a material under a near-field dynamic framework; (2) determining the support domain radius delta of each node, and searching and storing information of other nodes in the support domain range of each node; (3) determining space coordinates of an initial crack surface in a three-dimensional space; according to input initial crack surface space coordinates, a space plane equation is calculated, and a space coordinate range is determined; (4) according to a plane equation, screening out nodes in the model, wherein the distance between the nodes and the initial crack surface is smaller than 1.25 times of the radius delta of the support domain; and (5) processing the screened nodes, and analyzing whether the connecting lines between the nodes and the nodes in the support domain penetrate through the initial crack surface or not. The method provided by the invention has a great promotion effect on solving the problem of three-dimensional crack propagation containing an inherent crack surface through near-field dynamics.

Description

technical field [0001] The invention belongs to the technical field of solid mechanics numerical calculation, and in particular relates to a method for pre-processing a three-dimensional initial crack surface in a peridynamic model. Background technique [0002] Most of the rock cracks encountered in practical engineering are deeply buried in the rock mass or only exposed on the shallow surface. The dynamic expansion of these cracks cannot be simply transformed into a plane two-dimensional problem, and their essence is three-dimensional. . Therefore, the 3D crack propagation simulation is more practical. However, due to the complexity of the problem, there are great obstacles in the theoretical study of three-dimensional crack propagation. [0003] The classical fracture mechanics based on the Griffith energy criterion has not yet found a suitable solution to solve the bivariational problem encountered in the three-dimensional fracture problem. In the field of material me...

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Application Information

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IPC IPC(8): G06F30/23G06T17/20G06F119/14
CPCG06F30/23G06T17/20G06F2119/14
Inventor 崔昊韩月王成灿闫自海沈碧辉
Owner POWERCHINA HUADONG ENG COPORATION LTD
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