Probabilistic life evaluation method based on crack detection probability model

A technology of detection probability and probabilistic life, which is applied in the field of probabilistic life evaluation based on the crack detection probability model, and can solve the problems of reliability affecting the accuracy of life evaluation

Inactive Publication Date: 2015-03-04
BEIHANG UNIV
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Problems solved by technology

However, the reliability of detection affects the accuracy of life assessment, so the probability of crack detection is proposed

Method used

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  • Probabilistic life evaluation method based on crack detection probability model
  • Probabilistic life evaluation method based on crack detection probability model
  • Probabilistic life evaluation method based on crack detection probability model

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Embodiment Construction

[0044] The probabilistic lifetime assessment method provided by the present invention will be described in detail below with reference to the drawings and embodiments.

[0045] The invention provides an analysis method for analyzing the influence of the uncertainty of detection equipment and the uncertainty of fatigue crack growth model parameters on fatigue life, and proposes a residual probability life evaluation method. This method needs to obtain experimental data through fatigue tests, such as figure 1 As shown, the method is specifically realized through the following steps:

[0046] The first step is fatigue test and crack monitoring of aluminum alloy riveted joints;

[0047]Fatigue tests are carried out on aluminum alloy riveted joints, and crack monitoring is carried out by Lamb wave monitoring method based on piezoelectric sensors. At the same time, the actual value of the crack is measured with a mobile optical microscope, and a series of crack prediction values ​...

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Abstract

The invention discloses a probabilistic life evaluation method based on a crack detection probability model and belongs to the field of structure health monitoring technology. According to the probabilistic life evaluation method, experiment data is used as a basis; corresponding models are chosen by theoretical analysis for simulating; the correctness and effectiveness of the method are verified by original experiment data, so that a more sufficient basis is provided for a decision maker. Real-time Bayesian updating and estimation are carried out on parameters of a crack propagation model, so that the model is high in applicability and has the characteristics of high accuracy and high analysis speed.

Description

technical field [0001] The invention belongs to the technical field of structural health monitoring, and in particular relates to a probabilistic life evaluation method based on a crack detection probability (POD) model. Background technique [0002] Structural health monitoring technology comprehensively uses sensor technology, signal processing and analysis technology, fatigue fracture theory and probability statistics theory, etc., to monitor the actual situation of the structure in real time, and provides important information for the safety, reliability and durability of large-scale key structures. refer to. As the most common failure mechanism of aeronautical structures, fatigue failure has a great impact on the durability of structures, so the diagnosis and prediction of fatigue has become an important part of structural health monitoring. Nondestructive testing based on Lamb waves has a wide range of applications due to its economy, and is increasingly used in life ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 王邓江何晶靖董邦林张卫方阳劲松周艺斌刘天娇方小亮王红勋
Owner BEIHANG UNIV
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