High-sensitivity composite material structure health monitoring system

Abstract

The invention relates to a high-sensitivity composite material structure health monitoring system, which comprises a vacuum pump, a gas concentration sensor, a computer and two hollow fiber pipes which are alternatively parallel to each other and are arranged at intervals. One of the hollow fiber pipes is filled with special gas, and the other one of the hollow fiber pipes is vacuum pumped by a vacuum pump. When no crack exists, the special gas fiber pipe maintains at a given pressure value, the vacuum fiber pipe maintains at the vacuum state, and the pressure difference is constant. When crack exists, the special gas fiber pipe is communicated with the vacuum fiber pipe through the crack to cause the flow of the special gas under the driving of the pressure difference, so the concentrate of the gas inside the vacuum fiber pipe is changed. The concentration variation of the gas inside the vacuum fiber pipe is measured through the gas concentration sensor, and the size of the crack is calculated through the computer. The initiation and expansion process of the micro-crack can be monitored by monitoring the variation process of the gas concentration of the vacuum fiber pipe. The monitoring system has the advantages of real-time, simplicity, practicability and high reliability.

Description

technical field [0001] The invention relates to the field of composite material structure microcrack monitoring, in particular to a high-sensitivity composite material structure health monitoring system. Background technique [0002] Composite materials are widely used in many fields, and there is a clear tendency to replace traditional materials. Safety is the primary concern in the application of composite material structures. However, during the use of the material structure, due to the influence of temperature, impact, electromagnetic and other factors, a series of safety hazards such as micro-cracks, excessive strain or high temperature are prone to appear, which may bring disastrous consequences. The structural health monitoring system of composite materials can make up for the shortcomings of the current monitoring system based on visual inspection and subsequent testing. Once it is successfully deployed, it can theoretically maintain structural safety at all times. ...

AI Technical Summary

Problems solved by technology

However, among the composite material structure health monitoring technologies reported at home and abroad, there are not many technologies that can monitor the growth process of microcracks in composite material structures.

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