Re: [PSUBS-MAILIST] Acrylic laminating

["Brian Cox" <ojaibees@ojai.net>]

By "strain-relieving" I guess you would be referring to the annealing process of heating it up and then slowly letting it cool down.  But if you used laminated sheets I think that you would not have any strain on the material since you haven't heated it.   Under pressure they would act like individual "gaskets" of progressively smaller diameters.  But of course I could be wrong.

Brian

 
----- Original Message ----- 
From: "John Brownlee" <jonnie@scarymonsters.net>
To: <personal_submersibles@psubs.org>
Sent: Thursday, January 15, 2004 9:02 AM
Subject: Re: [PSUBS-MAILIST] Acrylic laminating


> Okay, I'll ask the (probably stupid) question here:
> 
> If you laminate two sheets of thick acrylic, how do you strain
> relieve it? Cast acrylic is all one piece, and is purportedly easy to
> release from casting and machining-caused internal stresses. Is there some
> way to determine the strength of a lamination to axial and sheer forces
> other than destructive testing? I thought there were a variety of reasons
> why plastic viewports were cast, machined and strain-relieved in an oven
> before use, but I understand the desire to do a dome in pieces.
> This is an area I know very little about, so be gentle if this is
> an obvious or silly question.
> 
> Thank you all,
> 
> -- 
> John
> 
> John Brownlee
> Chief Systems Administrator
> Scary Monsters Network
> jonnie at scarymonsters dot net
> 
>