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Plane multi-crack fatigue propagation analysis method based on distributed dislocation method

An analysis method and multi-crack technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems that cannot be simplified from two-dimensional problems to one-dimensional problems, increase calculation workload, and low calculation efficiency, etc., to achieve The effect of short calculation time, fast calculation speed and high calculation efficiency

Pending Publication Date: 2019-01-22
WUYI UNIV
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AI Technical Summary

Problems solved by technology

[0004] 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
[0005] 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
[0006] 3. 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.
[0007] 4. The existing crack growth analysis system is difficult to model when dealing with multi-crack problems, and the efficiency is not high

Method used

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  • Plane multi-crack fatigue propagation analysis method based on distributed dislocation method

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Embodiment Construction

[0020] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] The fatigue growth analysis system for planar multi-cracks based on the distributed dislocation method is implemented in Fortran programming language.

[0022] Such as figure 1 Shown:

[0023] 1. Start running.

[0024] 2. To establish an analysis model based on the actual structure, it is only necessary to create a geometric model without cracks, as well as loads and constraints.

[0025] 3. Introducing cracks. Only information about the number, location, length and angle of cracks is entered through the interface. No meshing of cracks is required.

[0026] 4. Make calculations. The core calculation program of this analysis system is used to calculate the stress intensity factor of each crack tip.

[0027] 5. Crack growth prediction. According to the stress intensity factor of the crack tip, c...

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Abstract

The invention discloses a plane multi-crack fatigue propagation analysis method based on distributed dislocation method, firstly, according to the initial geometry and crack conditions, the continuousdislocations are used to simulate the number of broken line cracks in the plane, and the singular integral equations are established according to the stress equilibrium conditions on the line of thecracks, and 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 propagation analysis of plane multi-cracks can be realized after many operations.

Description

technical field [0001] The invention belongs to the technical field of fatigue crack growth analysis of metal structures, and relates to a plane multi-crack fatigue growth analysis method based on a distributed dislocation method. Background technique [0002] Fatigue crack growth analysis of metallic structures is an important topic in the fields of mechanics, civil engineering and aeronautics. The current popular two-dimensional fatigue crack analysis system is mainly based on finite element method calculations. Some researchers use general commercial finite element calculation software for fatigue crack growth analysis, and some researchers use special crack growth analysis software for fatigue crack analysis. analyze. [0003] Disadvantages / deficiencies of existing technologies: [0004] 1. Using general commercial finite element calculation software for fatigue crack growth analysis requires manual programming, and the automatic crack growth cannot be realized by the ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F2119/06G06F30/20
Inventor 张炯
Owner WUYI UNIV
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