Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Forces on an underwater vessel

  1. Jan 8, 2013 #1
    I have a question about a Fiberglass Hemisphere that is 16" in diameter and 8 " in height. It is being used as a vessel under the water so it has a closed top. I wanted to know how to figure out how much stress from water pressure it will handle before it fails.
    thanks!
     
  2. jcsd
  3. Jan 8, 2013 #2

    haruspex

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    Which way up is it? Are you saying it has a flat top, or a (possibly open) flat base?
     
  4. Jan 9, 2013 #3

    Low-Q

    User Avatar
    Gold Member

    I understand it this way that you have a kind of bucket upside down. The water pressure will compress the air inside, at the same time as the surrounding pressure (outside the vessel) is the same. The vessel will be filled with water as the air is compressed to a smaller volume. The vessel will probably not "blow apart" under such experiment unless the vessel is so tall that there is considerably less water pressure at the top compared to the bottom. The air inside will have approx the same pressure acting on the walls any place inside. Considerably higher on the top compared to the water pressure outside - too much difference and it will blow apart.

    Vidar
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Forces on an underwater vessel
  1. Underwater barrier (Replies: 4)

  2. Bubbles underwater (Replies: 6)

  3. Pressure Vessel (Replies: 3)

  4. Underwater Pressure (Replies: 3)

  5. Pressure vessel (Replies: 13)

Loading...