Universal phase field method for simulating different failure modes of a brittle material

Abstract

The invention discloses a universal phase field method for simulating different failure modes of a brittle material. The method comprises the following steps of: obtaining material parameters requiredby a numerical simulation process through a uniaxial tensile test and a uniaxial compression test, substituting the measured material parameters into an established finite element model, carrying outenergy decomposition on the elastic strain energy of the test sample, carrying out variation on the energy, further establishing a universal balance equation and a crack evolution equation so as to obtain an overall control equation, and solving by adopting an iterative method or a distributed decoupling algorithm, so that accurate simulation of the crack propagation process, the crack propagation direction and the crack propagation path of the brittle material under complex stress is realized. According to the invention, the application range of a phase field model is greatly expanded; the simulation precision of the crack propagation process is greatly improved, and the problem of inaccurate prediction of the crack development direction of a traditional model is solved; and the solvingefficiency is improved, and the risk of non-convergence in the iterative solving process is reduced.

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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Problems solved by technology

[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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