A Universal Phase Field Method for Simulating Different Failure Modes of Brittle Materials
A failure mode, brittle material technology, applied in the field of computational mechanics, can solve problems such as simulating the fracture of brittle materials, and achieve the effects of ensuring calculation accuracy, expanding the scope of application, and improving simulation accuracy
Active Publication Date: 2021-05-18
WUHAN UNIV
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[0006] The present invention proposes a universal phase field method for simulating different failure modes of brittle materials, which is used to solve or at least partly solve the limitations of phase field models in simulating the fracture of brittle materials under complex stress states
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[0086] The present invention mainly solves the limitations of the field model in simulating the fracture of brittle materials under complex stress conditions. The method provided by the present invention is applicable to rocks, concrete, pottery, sea ice and other brittle solid materials in various stress failure modes (pure tensile, Simulation and prediction of crack initiation and propagation process under pure shear, tension shear, compression shear).
[0087] Main idea of the present invention is as follows:
[0088] Through the uniaxial tensile test and uniaxial compression test, the material parameters required for the numerical simulation process are obtained, and the measured material parameters are substituted into the established finite element model, and the elastic strain energy of the sample is energy decomposed and the energy is varied. Further establish a universal balance equation and crack evolution equation, so as to obtain the overall control equation, and...
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The invention discloses a universal phase field method for simulating different failure modes of brittle materials. The parameters are substituted into the established finite element model, the elastic strain energy of the sample is decomposed and the energy is varied, and the universal balance equation and crack evolution equation are further established to obtain the overall control equation. The iterative method or distribution The decoupling algorithm is used to solve the problem and realize the accurate simulation of the crack growth process, crack growth direction and crack growth path of brittle materials under complex stress. Through the present invention, the scope of application of the phase field model is greatly expanded; the simulation accuracy of the crack growth process is greatly improved, and the problem of inaccurate prediction of the crack development direction in the traditional model is solved; the solution efficiency is improved, and the iterative solution process is reduced. Convergence risk.
Description
technical field [0001] The invention relates to the field of computational mechanics, in particular to a universal phase field method for simulating different failure modes of 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. The traditional phase field model only considers the tensile part of the elastic body energy of the material during the fracture process, and does not include the shear part and compression part into the theory. However, in addition to the pure tensile failure, there are many other forms of brittle fracture damage. Form (such as pure shear failure, tensile shear failure, compression shear failure, etc.). The traditional phase field model is not suitable for ...
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IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0003G01N2203/0017G01N2203/0019G01N2203/0066G01N2203/0075G01N2203/0252G01N2203/0676G01N2203/0682
Inventor 王桥岳强周伟刘彪田文祥姬翔黄诚斌
Owner WUHAN UNIV