Bilinear adaptive phase field method for simulating brittle material damage

A brittle material and bilinear technology, applied in the field of computational mechanics, can solve the problems of phase field model grid division and computational efficiency limitations, and achieve the effect of avoiding the exponential increase of calculation amount, leaping in efficiency and improving accuracy

Active Publication Date: 2020-12-04
WUHAN UNIV
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Problems solved by technology

[0005] The present invention proposes a bilinear adaptive phase field method for simulating the failure of brittle materials, which is used to solve or at le...

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  • Bilinear adaptive phase field method for simulating brittle material damage
  • Bilinear adaptive phase field method for simulating brittle material damage
  • Bilinear adaptive phase field method for simulating brittle material damage

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Embodiment Construction

[0060] The invention mainly solves the limitation problem of grid division and calculation efficiency when the phase field model simulates the crack propagation of brittle materials.

[0061] Main idea of ​​the present invention is as follows:

[0062] Obtain the material parameters required for the numerical simulation process through uniaxial tensile tests, create bilinear quadrilateral elements or bilinear triangular elements, establish phase field model control equations, establish finite element numerical models and assign material parameters and boundary conditions to them and the finite element grid, so as to solve the governing equation to obtain the phase field distribution, judge whether there are elements that need to be adaptively divided according to the phase field value, if so, solve the original load step again after the mesh is refined, otherwise proceed to the next step One-step solution, so as to finally realize the accurate simulation of the crack growth pr...

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Abstract

The invention discloses a bilinear adaptive phase field method for simulating brittle material damage, which comprises the following steps of: obtaining material parameters required by a numerical simulation process through a uniaxial tensile test, creating a bilinear quadrilateral unit or a bilinear triangular unit, and establishing a phase field model control equation, establishing a finite element numerical model and endowing the finite element numerical model with material parameters, boundary conditions and finite element grids so as to solve a control equation to obtain phase field distribution, judging whether a unit needs to be adaptively divided or not according to a phase field value, if so, solving the original load step again after grid refinement, otherwise, carrying out the next step of solving, and otherwise, carrying out the next step of solving; therefore, accurate simulation of the crack propagation process, the crack propagation direction and the crack propagation path of the brittle material under complex stress is finally realized. According to the invention, the calculation efficiency of the phase field model is greatly improved; the simulation precision of the crack propagation process is greatly improved, and a series of problems caused by the fact that a traditional model cannot reasonably divide grids are solved.

Description

technical field [0001] The invention relates to the field of computational mechanics, in particular to a bilinear adaptive phase field method for simulating damage to brittle materials. Background technique [0002] As a new dispersion method based on finite elements, the phase field model has many advantages in simulating the fracture and failure of brittle materials. In recent years, it has been widely used in the analysis and research of various solid materials such as rocks, concrete, ceramics, and sea ice. One of the main tasks of the phase field model is to predict the crack propagation path of material damage. In order to achieve the accuracy of the simulation, it is necessary to finely divide the grid at the crack growth position. Significantly increase the amount of calculation and time consumption, and it is difficult to find a reasonable area for grid refinement when the crack propagation path is not clear by manual area division. The quality of grid division dire...

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Application Information

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IPC IPC(8): G06F30/23G06F111/10
CPCG06F30/23G06F2111/10
Inventor 王桥岳强周伟刘彪姬翔田文祥黄诚斌
Owner WUHAN UNIV
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