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