The metal boss is a load-bearing component of Type Ⅳ pressure vessels. It usually adopts an integrated skirt structure, where stress concentration occurs under lifting loads, reducing structural strength and service life. A skirt-notch structure for the metal boss was proposed to improve stress uniformity in the skirt region during lifting operations. First, theoretical formulas for the number, length, and width of the skirt notches were derived based on the basic dimensions of the boss, and the feasible parameter ranges were calculated under given conditions. Then, a finite element structural mechanics model of the type Ⅳ pressure vessel head section was established, and the Mises stress difference in the skirt region was used as the evaluation index for stress uniformity. Finally, single-factor tests and response surface methodology were combined to analyze and optimize the notch parameters. The results show that the Mises stress difference decreases first and then increases as the notch length, width, and number increase. The influence order is number > width > length. With the optimized parameters of a length of 7.8 mm, a width of 16.3 mm, and a number of 3, the Mises stress difference is reduced by 45.1% compared with the traditional boss, and the stress distribution becomes more uniform. The proposed skirt-notch structure effectively enhances the structural strength and service life of metal boss in type Ⅳ pressure vessels.
NIU Shen, HOU Tao, LIU Xian-chun, MING Ping-mei, REN Lei, ZHANG Zheng.
Parametric Optimization and Mechanical Analysis of Skirt-notch Structures for Metal Boss in Type Ⅳ Pressure Vessels[J].
Science Technology and Engineering, 2026, 26(30): 13072-13079 DOI:10.12404/j.issn.1671-1815.2508233
WangYijia, WuWan, LongYujiao, et al. Research progress on assessment technology for pressure pipelines with defects[J]. Science Technology and Engineering, 2024, 24(18): 7476-7486.
ZhangSiwei, TangYufeng, LiWenjie, et al. Safety assessment of high-temperature pressure vessels based on finite element and deep learning[J]. Science Technology and Engineering, 2024, 24(33): 14226-14236.
WuChaoling, ZhangYuchen, DuRui, et al. Development status, challenges and future directions of hydrogen storage and transportation technology[J]. Science and Technology Foresight, 2024, 3(4): 22-33.
LiYufeng, ZhaoJipeng, ZhePeng, et al. Fatigue design and ANSYS analysis of fiber-wound gas cylinders with titanium thin-wall liners[J]. Science Technology and Engineering, 2026, 26(3): 980-988.
[13]
CheJ L, HanM G, ChangS. Prediction of composite layer thickness for Type Ⅲ hydrogen pressure vessel at the dome part[J]. Composite Structures, 2021, 271. DOI: 10.1016/j.compstruct.2021.114143.
LiJian, ZhangLixin, LiRuiyi, et al. Research progress on high-pressure hydrogen storage vessels[J]. Energy Storage Science and Technology, 2021, 10(5): 1835-1844.
[16]
KisD I. A review on the factors of liner collapse in type Ⅳ hydrogen storage vessels[J]. International Journal of Hydrogen Energy, 2024, 70: 236-253.
GaoZhihui, GuoShufen, SunFulong, et al. Analysis and research on key technologies of fully wrapped gas cylinders with non-metallic liners[J]. Auto Manufacturing Engineer, 2022(S1): 21-27.
[19]
RondinellaA, GkikasG, FurfariS, et al. Study of the failure mechanism of a high-density polyethylene (HDPE) liner in a type Ⅳ hydrogen cylinder[J]. Polymers, 2024, 128: 108080.
ZhangYikai, FengJiaji, GuJunfeng, et al. A review of liner damage and burst failure in type Ⅳ onboard high-pressure hydrogen storage cylinders[J]. Composites Science and Engineering, 2024(8): 97-109.
[22]
ShaoW D, WangJ, HuD H, et al. Lightweight type-Ⅳ hydrogen storage vessel boss based on optimal sealing structure[J]. Vehicles, 2024, 15(6): 261.
[23]
ZhuJ Q, LiY, CaoW D, et al. Failure analysis of novel BOSS structures for type Ⅳ hydrogen storage vessels[J]. Energies, 2023, 16: 4005.
[24]
MengZ W, JinS K, YuM, et al. Analysis of the boss structure of type Ⅳ composite vessel for a high-pressure hydrogen tube trailer[J]. Sustainability, 2024; 16(12): 5098.
ChenYibo, WangXiulei, ZhaYan, et al. Design and performa-nce simulation of sealing structures for type Ⅳ high-pressure hydrogen storage cylinders[J]. Pressure Vessel Technology, 2023, 40(9): 37-44.
[27]
ParkG, JangH, KimC. Design of composite layer and liner for structure safety of hydrogen pressure vessel (type 4)[J]. Journal of Mechanical Science and Technology, 2021, 35: 3507-3517.
[28]
ThanhQ H, Hee-SeokR, RajeshK A. Performance assessment of 700-bar compressed hydrogen storage for light duty fuel cell vehicles[J]. International Journal of Hydrogen Energy, 2017, 42(40): 25121-25129.
[29]
冯家稷. Ⅳ型储氢气瓶成型与爆破失效分析[D]. 大连: 大连理工大学, 2025.
[30]
FengJiaji. Forming and burst failure analysis of type Ⅳ hydrogen storage cylinders[D]. Dalian: Dalian University of Technology, 2025.
LiuXuzhen, LuKaikai, ZhaoWanying, et al. Preparation of phosphorylated raffinose and its in vitro antioxidant activity[J]. Science and Technology of Food Industry, 2026, 47(16): 1-9.
JiaDemin, WangXiaoyan, WangPeilun, et al. Simulation study on the influence of structural parameters on the entrainment ratio of ejectors based on the response surface method[J]. Journal of Southwest Jiaotong University, 2024, 59(5): 1167-1175.