[PSUBS-MAILIST] epoxy domes

[Jon Wallace via Personal_Submersibles]

 What's the max pressure you can test?


    On Thursday, August 4, 2022 at 09:42:41 AM EDT, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 Hi JonI am thinking a 8 inch OD., to fit my chamber and 1 inch thick so that we can break the port potentially.  We may have to go thinner though. Hank

Sent from my iPhone

On Aug 4, 2022, at 7:03 AM, Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote:



 Interesting concept.  Lots of questions.  What sizes are the dimension being used for port testing?  
Jon

    On Thursday, August 4, 2022 at 07:52:01 AM EDT, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 Hi all,A friend has asked me to help him make a dome using epoxy casting resin.  I tried to discourage him, but his arguments have merit.I had him make a sample piece 2 inches thick and big enough to start testing.  The sample is amazingly clear.  I started by cutting and machining sample strips for bend testing as well as one pice to set out in the sunlight and one piece is stored in the shop.  So far to my surprise the epoxy machines as well as the acrylic and the comparison bend test with acrylic were also a surprise also.  Both the acrylic and epoxy had the same strength resisting bending and returning to normal.  I measured the bending movement with my magnetic base dial gauge and they were within .010 inch of each other.  The acrylic sample broke before the epoxy, by a good percentage.  I will repeat this test several times, but we are now making ports that will fit in my port testing chamber and do many pressure cycles and destruction tests.  This will give us a base line against acrylic.  If it works out we will make a small 2 inch thick by 24 inch dome and pressure test that.  Fingers crossed.Hank_______________________________________________
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