In my opinion, the answer depends on the
arc segment, with 180 degrees being the maximum and 60 degrees as a minimum.
60 degrees is the smallest recommended
segment (according to Stachiw) and has significant radial loads under compression
(side wall surface equal to surface of the flat face).
180 degrees has no radial loading at all. The
geometry can be calculated on a sliding scale between the two extremes
depending on arc segment.
This not something that I can reference-
it’s just my own method.
Greg Cottrell
Project Manager
http://www.precisionplastics.com
P please consider the environment before printing this email
From: owner-
Sent: Tuesday, June 14, 2011 2:54
PM
To:
Subject: RE: [PSUBS-MAILIST]
Hemisphere Seat Formula
Jon,
The books I (and you)
know dont say anything about that.
If flat enough (both
machined), I think you can calculate with all the surface.
For a dome calculated
with the GL table, I found out that the pressure is about half the max allowable
pressure of 110 N/mm^2
Emile
Van: owner-
Verzonden: dinsdag 14 juni 2011
19:19
Aan:
Onderwerp: Re: [PSUBS-MAILIST]
Hemisphere Seat Formula
No
replies. Let me try another way...those of you with hemisphere
domes, how did you calculate the seat requirements? I don't think total
surface area of the dome can be used to find the total stress on the
steel seat.
Jon
On 6/11/2011 6:11 PM, Jon Wallace wrote:
>
> Looking for info on seat design (square edges) for a hemisphere dome
> and how much of the surface area of a hemi contributes to force
> against the seat.
>
> Jon
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