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Optimized Sealing Process and Real-Time Monitoring of Glass-to-Metal Seal Structures

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Damage Monitoring of Composite Adhesive Joint Integrity Using Conductivity and Fiber Bragg Grating.

Chow-Shing Shin¹, Liang-Wei Chen¹

¹Department of Mechanical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan.

|March 29, 2023

Summary

This study compares fiber Bragg grating (FBG) sensors and carbon nanotube (CNT)-doped joints for monitoring adhesive joint health. Refined FBG spectrum analysis and CNT resistance offer improved damage detection without applied load interference.

Keywords:

adhesive joint carbon nanotubes fatigue failure fiber Bragg grating full spectral response structural health monitoring tensile failure

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Area of Science:

Materials Science
Structural Health Monitoring
Composite Materials

Background:

Adhesive joints are crucial in composites, but conventional methods fail to detect early degradation.
Existing monitoring techniques like fiber Bragg grating (FBG) sensors and carbon nanotube (CNT)-doped joints have limitations.
Previous studies often took measurements under applied load, confounding damage signals.

Purpose of the Study:

To compare the effectiveness of FBG sensors and CNT-doped joints for monitoring adhesive joint integrity.
To develop improved monitoring techniques that overcome limitations of previous methods.
To assess damage development under tensile and cyclic fatigue loading.

Main Methods:

Embedded FBG sensors and CNT-doped conductive joints were used to monitor damage.
Measurements were taken at low, fixed loads to isolate damage effects.
The entire FBG spectrum was analyzed, and a new quantitative parameter was proposed.
Damage was visualized using fluorescent penetrant and correlated with sensor data.

Main Results:

The study refined FBG spectrum analysis to better detect non-uniform strain caused by defects.
CNT resistance monitoring provided an alternative signal for damage assessment.
A quantitative parameter was developed to describe FBG spectrum changes for monitoring.
Correlations were established between sensor signals and actual damage extent.

Conclusions:

The refined techniques offer improved capabilities for detecting early-stage degradation in adhesive joints.
This work highlights the relative strengths and weaknesses of FBG and CNT monitoring methods.
The proposed methods provide a more reliable approach to structural health monitoring of composite adhesive joints.