[PSUBS-MAILIST] exotic steel

[Alan James via Personal_Submersibles]

Hi Scott,it's probably 4 x the price of steel.Phil makes his exosuit out of cast A356 alluminium.There are holes created during the casting process that in his instanceare filled with expoxy which is forced in under pressure. Then it is hardanodized. As he said you would think the process would be the other way round.I doubt you would find anyone with an anodizing bath big enough for what you want.Casting wouldn't be an option due to expense & again finding a bath the size youneed for post casting heat treatment would be a problem.Although lighter for the same strength you would need to go twice as thick (guess).You may find someone in the world that can spin a large thick aluminum hemisphere.If you do, it then may be a matter of comparing the price of aluminium versus metal &syntactic foam. With the syntactic foam option you could end up with better stability.Alan



      From: via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Saturday, May 2, 2015 6:43 AM
 Subject: Re: [PSUBS-MAILIST] exotic steel
   
Cool. So what are the drawbacks of aluminum? Why don't most deep divers use it? Thanks,
Scott Waters  
-------- Original Message --------
Subject: Re: [PSUBS-MAILIST] exotic steel
From: Jon Wallace via Personal_Submersibles
<personal_submersibles at psubs.org>
Date: Fri, May 01, 2015 11:31 am
To: Personal Submersibles General Discussion
<personal_submersibles at psubs.org>


I'm showing 1 inch thick for Aluminum 7079-T6 to reach 3000 feet at a usage factor of .8
I believe that equates to around 1,850 pounds with about 1,800 pounds of payload.  If you use ABS recommended .67 usage factor you have to bump up to 1-1/8 inch thickness.

Jon


On 5/1/2015 1:47 PM, via Personal_Submersibles wrote:

I know there was the aluminaut that was made of aluminum. What is the possibility of using aluminum instead of HY-100? I essentially know nothing about it.  Thanks,
Scott Waters
 
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