中等厚度蛋形复合材料耐压壳的结构失效研究
Investigation on Structural Failure of Medium-thick and Egg-shaped Composite Shell
李永胜 1王纬波 1于昌利 2姜旭 2李泓运 1吴健1
作者信息
- 1. 中国船舶科学研究中心,无锡 214082;深海技术科学太湖实验室,无锡 214082
- 2. 哈尔滨工业大学(威海),威海 264209
- 折叠
摘要
针对中等厚度蛋形复合材料耐压壳的结构失效进行了理论与试验研究.分别采用解析法和有限元法计算中等厚度蛋形复合材料耐压壳在2 000 m设计工作水深下的应力分布,并对比研究了壳体的临界屈曲载荷和强度失效载荷.结合现有制备工艺和耐压壳端部的密封要求,设计并制备含金属连接结构的耐压壳试验模型,开展静水外压下的破坏试验,获得模型的极限载荷、破坏形态以及加载过程中的壳体应变.研究结果表明,耐压壳结构在静水压下主要产生强度破坏,而屈曲破坏不明显.数值模拟得到的耐压壳破坏载荷与模型试验结果吻合良好.研究结果可为深潜器蛋形复合材料耐压壳的结构设计优化提供参考.
Abstract
Structural failure of medium-thick and egg-shaped composite shells under hydrostatic pressure is investigated theoretically and experimentally.Firstly,the stress distribution of an egg-shaped composite shell under a designed water depth of 2 000 meters is investigated by analytical and finite element methods respectively.The critical buckling load and strength failure load of the shell are studied.Then,combined with the latest manufacturing process of the egg-shaped composite shell and its end sealing requirement,the egg-shaped composite pressure shell model and its metal joint are designed.The model is manufactured and tested up to failure under hydrostatic external pressure.The failure mode,ultimate load,and shell strains of the shell model are obtained.The results show that the shell mainly causes strength failure under the hydrostatic pressure while the buckling failure mode is not significant.The numerical result of the failure load of the shell under hydrostatic pressure agrees well with the test result.The research results can provide a reference for the structural design and optimization of the pressure hull of egg-shaped composite shell of deep submersibles.
关键词
蛋形复合材料壳/静水外压/破坏试验/结构失效/数值模拟Key words
egg-shaped composite shell/hydrostatic pressure/failure test/structural failure/numerical simulation引用本文复制引用
基金项目
国防科技技术领域基金项目(2022-JCJQ-JJ-1065)
出版年
2024
NETL
NSTL
万方数据