<html><head></head><body><p dir="ltr">Parallel projects... Sister subs... Could be fun.</p>
<p dir="ltr">Sean<br>
</p>
<br><br><div class="gmail_quote">On January 10, 2015 12:19:38 PM MST, hank pronk via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<pre class="k9mail"><br />Yes but there two of them.<br />Hank<hr /><br />On Sat, 1/10/15, Sean T. Stevenson via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<br /><br /> Subject: Re: [PSUBS-MAILIST] bolt in penetration<br /> To: "Personal Submersibles General Discussion" <personal_submersibles@psubs.org><br /> Received: Saturday, January 10, 2015, 2:16 PM<br /> <br /> If it is suitable, I presume you're calling<br /> dibs?<br /> Sean<br /> <br /> <br /> <br /> <br /> On January 10, 2015<br /> 12:10:14 PM MST, hank pronk via Personal_Submersibles<br /> <personal_submersibles@psubs.org> wrote:<br /> <br /> Sean,<br /> I may be able to on Monday. The sphere was<br /> owned by a university and we can contact them to find the<br /> manufacturer. Given that is was used as a pressure vessel<br /> paid for by a university working on a government project, I<br /> have to assume it is good stuff. Not very scientific but a<br /> fair assumption at this
stage. Luckily it is right in<br /> Brian's back yard in California so he was able to look<br /> at it and might be able to do some detective work.<br /> <br /> Hank<br /> On Sat, 1/10/15, Sean T. Stevenson via<br /> Personal_Submersibles<br /> <personal_submersibles@psubs.org> wrote:<br /> <br /> Subject: Re: [PSUBS-MAILIST]<br /> bolt in penetration<br /> To: "Personal<br /> Submersibles General Discussion"<br /> <personal_submersibles@psubs.org><br /> <br /> Received: Saturday, January 10, 2015, 2:02 PM<br /> <br /> Hank, any chance you can<br /> find out what the alloy<br /> is? This will have<br /> a profound effect on its efficacy.<br /> Sean<br /> <br /> <br /> <br /> <br /> On!<br /> January<br /> 10, 2015<br /> 11:51:22 AM MST, hank pronk via<br /> Personal_Submersibles<br /> <br /> <personal_submersibles@psubs.org> wrote:<br /> <br /> Sean, <br /> <br /> Thank you, that is helpful. My idea was to<br /> <br /> make the insert as tight as
possible (sweat it in) I am<br /> not<br /> sure if the difference in material<br /> would cause a problem<br /> though. The idea of<br /> seating the port into the shell a good<br /> <br /> option also. I am just chewing the fat here, I have<br /> enough<br /> on my plate but it is fun to think<br /> about. I was wrong about<br /> the size, the<br /> sphere is 6 feet and I wrote 60 in. I imagine<br /> that kills the rating quite a bit?<br /> Hank<br /> On Sat, 1/10/15,<br /> Sean T. Stevenson via Personal_Submersibles<br /> <personal_submersibles@psubs.org><br /> wrote:<br /> <br /> Subject: Re:<br /> [PSUBS-MAILIST]<br /> bolt in penetration<br /> To: "Personal<br /> <br /> Submersibles General Discussion"<br /> <br /> <personal_submersibles@psubs.org><br /> <br /> Received: Saturday, January 10, 2015!<br /> , 1:40<br /> PM<br /> <br /> You could certainly<br /> do that,<br /> although a three inch<br /> thick shell is pretty<br /> <br />
substantial - I might consider<br /> <br /> machining<br /> eg. conical window seats in the<br /> hull sh!<br /> ell<br /> directly,<br /> and then derating the hull<br /> to a depth<br /> whereby the<br /> actual hull<br /> <br /> thickness is the effective derated thickness<br /> plus the effective reinforcement, which<br /> just<br /> happens to be a<br /> <br /> contiguous shell. The<br /> bolt-in arrangement<br /> would not act as<br /> hull<br /> <br /> reinforcement though - unless it was a force fit in the<br /> hole. The idea of reinforcements around<br /> openings is to<br /> provide<br /> material around the<br /> hole to carry the shell<br /> hoop<br /> stresses that<br /> would<br /> otherwise have passed through the<br /> <br /> material in the opening, such that you<br /> don't increase<br /> the nominal shell<br /> stress. This requires a<br /> (relatively)<br /> smooth load path to redirect<br /> <br /> stress around the hole.
Br!<br /> ian<br /> recently<br /> asked me<br /> about the effectiveness of reinforcements<br /> <br /> like perpendicular flanges lining the hole,<br /> <br /> and this is a<br /> bit complicated, because<br /> some<br /> stress i!<br /> s<br /> indeed<br /> <br /> redirected into<br /> such a flange, but the load is not evenly<br /> <br /> distributed as you move inboar!<br /> d or<br /> outboard away from the<br /> hull<br /> shell (with<br /> diminishing returns at<br /> increasing<br /> <br /> distances),<br /> and you also introduce a stress concentration<br /> at<br /> the perpendicular<br /> transition. Ideally,<br /> reinforcements<br /> should<br /> be an effective<br /> <br /> thickening of the hull in the region<br /> <br /> immediately adjacent to the opening, tapered<br /> smoothly<br /> back<br /> (something<br /> like 4:1) into the hull<br /> shell to provide<br /> a<br /> continuous load path<br /> <br /> with no stress
concentrations at abrupt<br /> <br /> changes in geometry.<br /> Sean<br /> <br /> <br /> <br /> <br /> <br /> On<br /> January 10, 2015 8:25:39<br /> !<br /> <br /> <br /> AM MST, hank pronk via Personal_Submersibles<br /> <personal_submersibles@psubs.org><br /> wrote:<br /> Is it feasible to<br /> have a<br /> bolt in penetration in a 3 inch<br /> thick sphere<br /> hull. I am<br /> <br /> picturing machining a hole in<br /> the hull,<br /> then inserting a<br /> window housing<br /> with a shoulder(flange) that fits tight in<br /> <br /> the hole and is bolted in<br /> place. Can that arrangement<br /> act<br /> as reinforcement for the hul!<br /> l.<br /> <br /> Hank<br /> <br /> <br /> <br /> Personal_Submersibles mailing list<br /> <br /> Personal_Submersibles@psubs.org<br /> <a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br />
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