Session: MF-20-01 Material Quality and Failure Analysis-1

Paper Number: 123342

123342 - Hydrogen Permeation Behavior and Its Implications on Mechanical Properties of the Liner of Type Iv Hydrogen Storage Cylinders Under Typical Service Conditions 

Type IV hydrogen storage cylinders are increasingly recognized as a prime solution for hydrogen storage in hydrogen fuel cell vehicles (HFCVs). Compared with other cylinders, this type of hydrogen storage cylinder consists of a carbon fiber composite material wrapped with a polymer inner liner, which has the advantages of light weight, low cost, and fatigue resistance. Nonetheless, the polymer liner which is commonly made of high-density polyethylene (HDPE) or polyamide (PA), demonstrates notable hydrogen permeability, introducing a heightened risk of hydrogen penetrating leakage. This is one of the key factors affecting the safety of its operational application use in hydrogen storage scenarios. The hydrogen permeation property of the liner of Type IV hydrogen storage cylinder is intrinsically influenced by a confluence of operational factors, including service pressure, service temperature, and service duration. Owing to experimental limitations, there are few studies on the hydrogen permeation law of the liner material based on the actual working conditions of the type IV hydrogen storage cylinder. Furthermore, the current literature scarcely addresses the effects of high-pressure hydrogen permeation on the mechanical attributes of the Type IV cylinder liner materials. This research embarked on hydrogen permeation tests on several different HDPE and PA materials, executed under typical service conditions. The aim was to discern the relationship between hydrogen permeation characteristics of these liners with varying temperatures and pressures, while also identifying universal trends and consistencies across the materials. Based on this, the shifts in hydrogen permeability and tensile attributes of the materials before and after exposure to hydrogen were obtained and the effects of the high-pressure hydrogen service environment at different temperatures and pressures on the properties of the liner materials were investigated. According to the test results, a simulation of the cylinder liner's hydrogen permeation behavior under typical conditions was constructed, and the hydrogen permeation law of Type IV hydrogen storage cylinders is summarized. The results of this study and the elucidated hydrogen permeation laws serve as a basic reference for further research and design efforts to improve subsequent Type IV cylinder liners.

Presenting Author: Zhipeng Qi Institute of Process Equipment, Zhejiang University

Presenting Author Biography: Zhipeng Qi is a postgraduate student of Zhejiang University.

Authors:

Zhipeng Qi Institute of Process Equipment, Zhejiang University
Hao Shi Institute of Process Equipment, Zhejiang University
Zhengli Hua Institute of Process Equipment, Zhejiang University
Miaomiao Yang Institute of Process Equipment, Zhejiang University
Wenzhu Peng Institute of Process Equipment, Zhejiang University