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Weight function-based surface crack stress intensity factor database establishment method

A technology of stress intensity factor and surface cracks, which is applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., and can solve problems such as efficiency impact

Active Publication Date: 2020-09-11
BEIHANG UNIV
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Problems solved by technology

The numerical calculation method mainly uses the finite element method to calculate the stress intensity factor, which can be calculated for any structure, but its efficiency is affected by the modeling and meshing process

Method used

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  • Weight function-based surface crack stress intensity factor database establishment method
  • Weight function-based surface crack stress intensity factor database establishment method
  • Weight function-based surface crack stress intensity factor database establishment method

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Embodiment 1

[0065] In the specific implementation, when performing step S1 in the method for establishing the above-mentioned surface crack stress intensity factor database provided by the present invention, a finite element model is established for structures with different three-dimensional dimensions with surface cracks, and two values ​​are given on the crack surface. When a stress perpendicular to the crack surface is used as the boundary condition of the finite element model, it can be realized in the following ways:

[0066] The four parameters involved in the finite element model are the circular crack radius a, the thickness of the structure T, the width W of the structure, and the half-height L of the structure. These four parameters are simplified into three parameters after being dimensionless and The value ranges of these three parameters are:

[0067]

[0068] and According to the range of formula (1), the finite element model of the structure containing surface cr...

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Abstract

The invention discloses a weight function-based surface crack stress intensity factor database establishment method, which is used for improving the defect crack propagation calculation efficiency soas to provide a basis for linear elastic fracture mechanical analysis in surface probability damage tolerance evaluation. Specifically, finite element parametric modeling is adopted, a reference stress intensity factor under a given stress gradient is calculated on the basis of a J integral stress intensity factor theory, the calculation precision is not affected by the number of crack tip grids,and the calculation result is accurate; based on a weight function theory, structural bodies with different geometric configurations are established, and the limitation of a stress intensity factor manual is made up by a stress intensity factor efficient calculation method under any stress gradient; compared with a traditional stress intensity factor database, the structure configuration of the surface crack stress intensity factor database based on the weight function method is increased, and the stress intensity factor calculation error of an applicable structure is within 5%.

Description

technical field [0001] The invention relates to the technical field of probabilistic damage tolerance evaluation of aero-engines, in particular to a method for establishing a surface crack stress intensity factor database based on a weight function. Background technique [0002] Aeroengine life-limited parts refer to the rotor and main stator structural parts that may endanger the safety of the engine due to primary failure. Once a defect with a very small probability occurs in a life-limited part, its safety will be seriously threatened. Therefore, the American aviation industry has proposed a set of enhanced life management process to ensure the safety of life-limited parts, the core of which is to consider the defects with extremely low probability of life-limited parts and conduct probability damage tolerance assessment on them. This evaluation method combines random factors such as defects, loads, and non-destructive testing to calculate the failure risk of life-limite...

Claims

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Application Information

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IPC IPC(8): G06F30/23G06F119/04G06F119/14
CPCG06F30/23G06F2119/04G06F2119/14
Inventor 李果丁水汀周惠敏刘晓静
Owner BEIHANG UNIV
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