Experimental investigations on the implosion characteristics of thin cylindrical aluminium-alloy tubes

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:200

Article

Muttaqie, Teguh^1,2  Park, Sang Hyun³  Sohn, Jung Min²  Cho, Sang-Rai^3,4  Nho, In Sik⁵  Han, Soonhung⁶  Lee, Phill-Seung⁶  Cho, Yoon Sik⁷ 

[1] Ctr Technol Def & Secur Ind BPPT, Agcy Assessment & Applicat Technol, Jakarta, Indonesia

[2] Pukyong Natl Univ, Dept Naval Architecture & Marine Syst Engn, Busan, South Korea

[3] Univ Ulsan, Sch Naval Architecture & Ocean Engn, Ulsan, South Korea

[4] UlsanLab Inc, Ulsan, South Korea

[5] Chungnam Natl Univ, Dept Naval Architecture & Ocean Engn, Daejeon, South Korea

[6] Korea Adv Inst Sci & Technol, Dept Mech Engn, Daejeon, South Korea

[7] Agcy Def Dev, Chang Won, South Korea

关键词: Implosion;    Hydrostatic pressure test;    Collapse pressure;    Pressurising rate;    Aluminium-alloy 6061-T6;   

DOI  :  10.1016/j.ijsolstr.2020.05.008

来源: Elsevier

【 摘 要 】

Experimental studies are conducted to investigate the implosion characteristics of thin cylindrical aluminium-alloy tubes. The effects of various parameters that generate different responses on the implosion behaviours are investigated. Aluminium-alloy tubes are fabricated from a 6061-T6 material and designed in the range of 2.5-6.7 length-to-diameter ratios; wall thickness-to-diameter ratios are varied from 55 to 69. The geometric imperfection parameters, defined as the initial ovality and thickness unevenness, are considered. Two different pressurising media, i.e., water only and the combination of water and nitrogen gas are employed. In addition small- and medium-sized of pressure chamber are utilised to clarify the pressure drop after the ultimate strength reached. Furthermore, non-linear finite element analyses, benchmarked for quantitative validation and comparison of the imploded tubes, are conducted. The numerical benchmark quantities are initial ovality, thickness unevenness, and airbacked fluid cavity parameters. The results of these experiments indicated that the effects of combined water and nitrogen can reproduce a constant pressure environment similar as actual undersea conditions, but the combined pressuring media can reduce the pressuring rate. (C) 2020 Published by Elsevier Ltd.

【 授权许可】

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