A method for analyzing fatigue crack propagation of particle composite material

Abstract

A method for analyzing fatigue crack propagation of particle composite material is provided. First, according to the initial geometric conditions, The equivalent inclusion method is used to obtain thestress field distribution of the structure without cracks and only with particles, and then the continuous dislocation is used to simulate any number of broken line cracks in the matrix. The singularintegral equations are established according to the stress equilibrium conditions on the line of the cracks. The stress intensity factors of each crack can be obtained by solving these singular integral equations. After one step of crack propagation, a new fracture line crack can be obtained by adding a crack branch to the original fracture line crack. The new crack tip position can be recorded,and then a new singular integral equation can be established to solve the problem, so that the stress intensity factor of the new crack can be obtained. In this way, the automatic crack propagation analysis of particulate composites can be realized after many cracks are manipulated. When the invention carries out the crack propagation analysis of the multi-particle and the multi-crack, the modeling is very fast, and the calculation speed is also fast.

Description

technical field [0001] The invention belongs to the technical field of particle-reinforced metal-matrix composite materials, and relates to a method for analyzing crack fatigue growth of particle composite materials, in particular to an analysis method for crack fatigue growth of particle composite materials based on equivalent inclusion method and distributed dislocation method . Background technique [0002] Particle-reinforced metal matrix composites embed high-performance particles (inclusions) into the metal matrix in a certain distribution form. Due to the embedding of particle materials, particle-reinforced metal matrix composites usually have higher strength, stiffness, impact resistance, high temperature resistance and wear resistance than matrix materials, so they have gradually replaced traditional wood and metal alloys, and are widely used in aviation Aerospace, automobile, construction and other fields. [0003] However, with the addition of reinforcing partic...

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Problems solved by technology

[0006] 1. Using general commercial finite element calculation software for fatigue crack growth analysis requires manual programming, and cannot rely on the software itself to realize automatic crack growth

[0007] 2. There are special crack growth analysis software on the market, mainly based on finite element method calculations, which cannot simplify two-dimensional problems into one-dimensional problems, and the calculation efficiency is not high

[0008] 3. When the number of particles and cracks is large, the finite element modeling is difficult and the calculation speed is slow

[0009] 4. The biggest disadvantage of finite element crack extension is that after each step of crack extension, it is necessary to re-establish the model and mesh the model, which greatly reduces the calculation efficiency and increases the calculation workload

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