研究目的
Investigating the use of distributed fiber optic strain sensing and acoustic emission analysis for condition monitoring of hybrid type IV composite pressure vessels to detect material fatigue and predict failure.
研究成果
Distributed fiber optic strain sensing and acoustic emission analysis effectively monitored material fatigue and predicted failure in type IV composite pressure vessels. Critical material changes were detected 17,000 cycles before failure, demonstrating the potential for structural health monitoring in high-pressure vessels.
研究不足
The study faced challenges with sensor fiber damages, especially near ingress/egress points, affecting the reliability of DSS measurements. The outermost sensor fiber showed increased strain change fluctuations, possibly due to damaged fiber ends within the composite laminate.
1：Experimental Design and Method Selection:
The study employed distributed fiber optic strain sensing (DSS) using swept wavelength interferometry (SWI) and acoustic emission (AE) analysis for monitoring material degradation in a type IV composite pressure vessel.
2：Sample Selection and Data Sources:
A hybrid type IV composite pressure vessel was fabricated with integrated optical fibers in CFRP and GFRP layers.
3：List of Experimental Equipment and Materials:
Optical backscatter reflectometer (OBR 4600, LUNA Inc.), acoustic emission measurement device (AMSY-6, Vallen Systeme GmbH), and a hydraulic pressure system (PN020, Maximator GmbH) were used.
4：Experimental Procedures and Operational Workflow:
The vessel underwent load cycle tests with internal pressure varying between 20 bar and 260 bar, then increased to 300 bar, and finally at 65°C until burst. DSS and AE measurements were conducted during pressure ramps.
5：Data Analysis Methods:
Strain profiles were analyzed using the running reference method for DSS, and AE data was evaluated based on cumulated energy sum and felicity ratio.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
