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A test and detection method for the size of structural defects

A detection method and a technology for structural defects, which are applied in the field of defect detection and can solve problems such as uneconomical use of structures

Active Publication Date: 2018-04-10
CHINA AIRPLANT STRENGTH RES INST
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

But this leads to a very uneconomical use of the structure

Method used

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  • A test and detection method for the size of structural defects

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Experimental program
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Embodiment Construction

[0018] In project implementation, the specific implementation steps are as follows:

[0019] The first step is to obtain the input conditions of the structure of the inspected part, including the shape and size of the inspected part structure, the stress and force form of the inspected part structure during use, the fatigue loading history of the structure; the materials used for the inspected part structure The crack growth rate curve, the possible damage form and residual strength curve of the structure of the tested part;

[0020] The second step is to calculate the maximum service stress σ of the tested component structure s Theoretical limit crack size under a cs , calculated according to the remaining strength curve to obtain the maximum service stress σ of the tested part s The theoretical limit crack size of the lower structure a cs ;

[0021] The third step is to set the theoretical limit crack size a under the overload stress of the structure of the inspected par...

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Abstract

The invention provides a method for test and detection of structural defect size, which is characterized in that it includes the following steps: the first step is to obtain the input conditions of the structure of the inspected part, including the shape and size of the structure of the inspected part, the structure of the inspected part The stress and force form, the fatigue loading history of the structure, the crack growth rate curve of the material used in the structure of the inspected part, the possible damage form and residual strength curve of the inspected part structure; the second step is to calculate the The theoretical limit crack size acs of the structure under the maximum service stress σs is calculated according to the residual strength curve to obtain the theoretical limit crack size acs of the structure under the maximum service stress σs; the third step is to set the structure of the test part under the overload stress Theoretical limit crack size ai under overload stress, and calculate the safe crack growth interval n, where n represents the number of fatigue cycles of the tested component structure.

Description

technical field [0001] The invention relates to a method for detecting defects through tests, especially for detecting defects that may exist in an aircraft structure and exceed a certain set size and affect the safe use of the structure. Background technique [0002] During the use of the aircraft structure, with the prolongation of the service time and the increase in the number of uses, tiny fatigue cracks may appear in the structure and gradually increase. When the cracks in the structure increase to a certain extent, it may endanger the safety of the structure. History There have been many catastrophic accidents caused by structural fatigue in the world. For such problems, the current treatment method is to determine the service life of the structure through fatigue tests, and regularly carry out shutdown inspections during the service life to ensure that there are 3 chances to find the crack before the structure has a crack that endangers the safety of use, so as to ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/00G01N3/28G01N3/32
Inventor 郑建军冯建民高战朋夏龙刘兴科张文文
Owner CHINA AIRPLANT STRENGTH RES INST
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