A Method for Establishing the Surface Defect Distribution Curve of Hole Characteristic According to Airworthiness Requirements
A defect distribution and establishment method technology, applied in special data processing applications, instruments, complex mathematical operations, etc., can solve problems such as no description of establishment methods, restrictions on airworthiness certification of aeroengines, lack of input data, etc.
Active Publication Date: 2022-05-10
BEIHANG UNIV
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Problems solved by technology
At present, the United States has calculated the defect distribution curve of hole characteristics in the early 21st century. This curve does not conform to my country's national conditions, and there is no explanation for the establishment method. Moreover, the research on the establishment of surface defect distribution curve of hole characteristics in my country is temporarily blank. Therefore, the surface probability The lack of key input data for damage tolerance assessment also seriously restricts the airworthiness certification of my country's aero-engines
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Embodiment 1
[0072] The first step is to use non-destructive testing to detect the characteristic surface of the hole in the aero-engine, count the defects in the production process and maintenance process, and measure the defect length L 0 and defect depth H 0 ,Will As the defect size; the initial defect size in the production process is the defect size obtained by statistics and measurement in the production process; according to the defect size in the maintenance process, based on the analysis of fracture mechanics, the expansion of the defect in the use process is eliminated, and Initial defect size during repair.
[0073] Specifically, according to the statistical and measured defect size in the maintenance process, based on the analysis of fracture mechanics, the expansion of the defect in the use process is eliminated, and the initial defect size in the maintenance process is obtained. Specifically, it can be achieved in the following ways:
[0074] Specific process such as fig...
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The invention discloses a method for establishing a hole characteristic surface defect distribution curve that meets airworthiness requirements. First, data processing is performed on the collected statistical data of surface defects, and the number of real defects is obtained by combining the probability of non-destructive detection, so as to obtain the excess number of defects; Curve fitting is performed on the defect size and excess number; finally, the defect distribution excess number baseline is adjusted based on the actual defect occurrence probability, and the initially obtained defect distribution curve is corrected based on the actual defect occurrence situation to establish a surface defect distribution curve. The surface defect distribution curve can reflect the processing and testing levels of different manufacturers to a certain extent, and provides important input data for the evaluation of probabilistic damage tolerance, which is of great significance for the evaluation of surface probabilistic damage tolerance. The damage tolerance assessment provides data support, and then supports the airworthiness certification work of my country's aero-engines, which has important engineering significance and practical value.
Description
technical field [0001] The invention relates to the technical field of probabilistic damage tolerance evaluation, in particular to a method for establishing a hole characteristic surface defect distribution curve that meets airworthiness requirements. Background technique [0002] The safety of aircraft engines is related to public safety. The key rotor and main stator components of aero-engines are called "life-limited components", and the failure of these components will lead to serious flight accidents. In the process of processing and maintenance, it is inevitable to introduce small-probability defects on life-limited parts, which will pose a great threat to the safety of aero-engines. Therefore, it is necessary to implement a series of life management behaviors to meet the Integrity requirements for life-limited parts. [0003] Article 33.70 of the US airworthiness regulations FAR-33 proposes a set of enhanced life management process, which requires probabilistic dama...
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IPC IPC(8): G06F30/20G06F17/18G06F17/11G06F119/14
CPCG06F30/20G06F17/18G06F17/11G06F2119/14
Inventor 李果丁水汀周惠敏
Owner BEIHANG UNIV