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A method for establishing the database of surface crack stress intensity factors based on weight function

A stress intensity factor and surface crack technology, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as efficiency effects, and achieve the effect of increasing structural configurations, accurate calculation results, and making up for limitations.

Active Publication Date: 2022-05-10
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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  • A method for establishing the database of surface crack stress intensity factors based on weight function
  • A method for establishing the database of surface crack stress intensity factors based on weight function
  • A method for establishing the database of surface crack stress intensity factors based on weight function

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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 method for establishing a database of surface crack stress intensity factors based on a weight function, which is used to improve the calculation efficiency of defect crack expansion, thereby providing a basis for linear elastic fracture mechanics analysis in surface probability damage tolerance evaluation. Specifically, finite element parametric modeling is used to calculate the reference stress intensity factor under a given stress gradient based on the J-integral stress intensity factor theory. The calculation accuracy is not affected by the number of crack tip grids, and the calculation results are accurate; based on the weight function theory, the establishment The efficient calculation method of stress intensity factors under arbitrary stress gradients for structures with different geometric configurations makes up for the limitations of the stress intensity factor manual; compared with the traditional stress intensity factor database, the weight function method based on the present invention The structure configuration of the surface crack stress intensity factor database has increased, and the calculation error of the stress intensity factor of the 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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Patent Type & Authority Patents(China)
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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