Acoustic emission characteristics of used 70 MPa type IV hydrogen storage tanks during hydrostatic burst tests. (31st March 2021)

• Record Type: Journal Article
• Authors: Wang, Dongliang; Liao, Binbin; Hao, Chunyong; Wen, Ange; Zheng, Jinyang; Jiang, Peng; Gu, Chaohua; Xu, Ping; Huang, Qianghua
• Is Part Of: International journal of hydrogen energy. Volume 46:Number 23(2021)
• Page Start: 12605
• Page End: 12614
• Publication Date: 2021-03-31
• Subjects: Hydrogen storage tanks -- Acoustic emission -- Signals characteristics -- Hydrostatic burst tests; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.12.177
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Currently, the periodic inspection of composite tanks is typically achieved via hydrostatic test combined with internal and external visual inspections. Acoustic emission (AE) technology demonstrates a promising nondestructive testing method for damage mode identification and damage assessment. This study focuses on AE signals characteristics and evolution behaviors for used 70 MPa Type IV hydrogen storage tanks during hydrostatic burst tests. AE-based tensile tests for epoxy resin specimen and carbon fiber tow were implemented to obtain characteristics of matrix cracking and fiber breakage. Then, broad-band AE sensors were used to capture AE signals during multi-step loading tests and hydrostatic burst tests. K-means ++ algorithm and wavelet packet transform are performed to cluster AE signals and verify the validity. Combining with tensile tests, three clusters are manifested via matrix cracking, fiber/matrix debonding and fiber breakage according to amplitude, duration, counts and absolute energy. The number of three clustering signals increases with the increase of pressure, showing accumulated and aggravated damage. The sudden appearance of a large number of fiber breakage signals during hydrostatic burst tests suggests that the composite tank structure is becoming mechanically unstable, namely the impending burst failure of the tank. Highlights: AE-based tensile tests and hydrostatic burst tests are implemented. Three clusters representing different damage modes are obtained. The AE signals characteristics during hydrostatic burst tests are studied.