钛合金载人舱模型球的外压压溃分析

在深海载人舱设计前,一般会通过缩比模型球的压力试验来考核材料和结构的性能,以便进一步优化结构的设计.本文结合Ti-6Al-4V ELI材料的模型球压溃后的断口分析和有限元仿真分析,对球壳的失效状态进行了说明.分析结果显示,局部屈服首先发生在球壳孔座附近,然后沿着焊缝的径向发生塌陷、撕裂,直至整个北半球发生破坏.仿真分析结果可以为载人舱球壳进一步的动态分析和冲击分析提供参考.

Collapse Analysis of Model Sphere of Titanium Manned Cabin under External Pressure

Before the final design of a deep-sea manned cabin, some small model spheres are general-ly made for test in a pressurized chamber to check the capabilities of the material and structure and provide reference for improvement of design. In this paper, the failure analysis and fracture surface ob-servation on a pressurized Ti-6Al-4V ELI model sphere are conducted, and the failure scenario of the model sphere is explained by finite element simulation. It is shown that localized yielding occurs first in the vicinity of the forged component, and the folding with tearing takes place along the radial direc-tion from the welding line of the forged component, which will be separated completely from the north hemisphere together with several fractured pieces. The finite element simulation can be used as a ref-erence for further dynamic or impact analysis of manned cabins.