Session: DA-03-01 Fatigue (joint with M&F and C&S)

Paper Number: 61530

Start Time: Thursday, July 15, 2021, 09:00 AM

61530 - Fatigue Life Calculation Method of 4130X High Pressure Hydrogen Storage Cylinder With Initial Crack Defect 

Hydrogen storage cylinders are often used for medium- and short-distance transportation of hydrogen. As we all know, the presence of hydrogen tends to increase the risk of using the gas cylinders. The alternating stress caused by factors such as  hydrogen charging and discharging during the service process of the gas cylinder leads to the expansion of initial cracks inside the cylinder and the final fatigue fracture. At present, the fatigue life calculation of pressure vessels mainly adopts the S-N curve method and the fracture mechanics method, however, 4130X steel does not have the S-N curve under the hydrogen environment. In this work, a method for calculating the fatigue life of fracture mechanics for hydrogen storage cylinders was established according to ASME Ⅷ-3 KD-10. The development of the program was completed by Matlab. An example was given to illustrate the program. Firstly, basic parameters of the material used for the cylinder were obtained. Then, finite element method was used for stress analysis to obtain the fitting curve and the function expression of hoop stress. Finally, fatigue life calculations of 4130X high pressure hydrogen storage cylinder were made. The results from the pressure fluctuation range and crack size were compared and the advantages of the fatigue life analysis in this method were expressed. The results could offer support to design, manufacture, safety evaluation of hydrogen storage cylinders.

 

Presenting Author: Peng Ge Zhejiang University

Authors:

Peng Ge Zhejiang University
Zhiping Chen Zhejiang university
Mengjie Liu Zhejiang university