Deep-sea implosion of spherical pressure shell considering geometric imperfection

• Published in: Ocean engineering 2024-09, Vol.307, p.118162, Article 118162
• Main Authors: Yang, Fu-Jin, Liu, Yun-Long, Wang, Jun, Wang, Bao-Jian, Guo, Jun
• Format: Article
• Language: English
• Subjects: Deep-sea implosion; Failure of pressure shell; Geometric imperfection; Implosion load
• ISSN: 0029-8018; 1873-5258
• DOI: 10.1016/j.oceaneng.2024.118162

Deep-sea pressure shells are at risk of implosion, making the study of implosion load characteristics crucial. This study utilizes the CEL numerical method to develop an implosion model for a standard titanium alloy spherical pressure shell and conducts simulation calculations for deep-sea implosion under different conditions. It reveals varying implosion characteristics with changes in the implosion strength parameter Pλ∗. Notably, there are significant differences in the peaks of implosion load in different directions for small Pλ∗. As Pλ∗ increases, the influence of the shell on the implosion load weakens, leading to a process closer to ideal bubble collapse. Additionally, the energy proportion of the implosion load is proportional to Pλ∗0.5. By introducing the linear buckling mode of the shell as the initial geometric imperfection, the influence of imperfection shape and amplitude on the implosion process and load is analyzed in detail. It is found that the amplitude has a greater impact on the implosion. Increasing the imperfection amplitude leads to a higher peak and energy proportion of implosion load, and advances the time to reach the peak. •The implosion of pressure shells due to buckling and strength failures is studied.•The implosion load during the implosion process of the pressure shell is studied.•As Pλ∗ increases, the shell’s impact on the implosion load gradually diminishes.•Influence of shell imperfection shape and amplitude on implosion load studied.