[转]水下钛合金容器设计问题

AdamC

I’m designing a subsea sensor that will go to a max depth of 600 m (6 MPa/60 bar). In a simple model, it will be made of a pressure housing cylinder and two end caps, all grade 5 titanium. Some geometry is attached.

I’m looking for advice on how to calculate the thickness of the cylinder/pressure housing based on the pressure. I’ve done some research and found a few methods:
1.    ASME Section VIII – Division 1 (UG-28)
2.    EN 13445-3:2009 Part 3: Design (Section 8 Shells under external pressure)
3.    ‘Designing Under Pressure’ in the Journal of Ocean Technology Vol. 3, No. 1, 2008 (Link here: https://www.thejot.net/article-preview/?show_article_preview=84with ） two theoretical results:
a.    Von Mises (same as first part of EN 13445)
b.    Windeburg and Trilling’s Buckling Pressure

Failure mode I can see is the combination of external pressure on the cylinder with the buckling load caused by the end caps pushing inwards.

Now I’ve run them through with the methods above and have varying outcomes for the pressure at yield:
1.    7.8 – 2.4 MPa for different grades of titanium (grade 5 not listed)
2.    11.5 – 10.5 MPa
3.    a. 77.9 MPa, b. 46.5 MPa

As you can see it varies a lot and not all good with a 6 MPa limit – what methodology do I use? Are these even correct? The last method (Journal of Ocean Technology) is interesting in that it explores adding factors to account for manufacturing defects (circularity for example).

Thanks in advance and happy to provide more info

Reference https://www.physicsforums.com/threads/subsea-pressure-housing-design-wall-thickness-for-stress-buckling.975379/

2266998

1，首先，这哥们不再鸟国，那为什么用鸟语写上述要求?，假如在鸟国，鸟国有一套稳定性计算程序，是既定的，

2， 不是这个行业的人，这个深度的仪器舱没有自己设计的，没有必要，因为设计以后制造，试验怎么解决？