REINFORCEMENT OF OPENING ON FLAT HEAD
REINFORCEMENT OF OPENING ON FLAT HEAD
(OP)
UG-39(b) seems to suggest that for openings in a flat head, only half the area required by UG-37 is needed to satisfy the reinforcement requirements for the opening. Is it safe to assume that a head needs only half the reinforcement area of a similar opening on a shell?





RE: REINFORCEMENT OF OPENING ON FLAT HEAD
A shell and spherical or ellipsoidal or similar head carries the load imparted by the internal pressure through membrane stress. This stress is directly proportional to the thickness. On the other hand, a flat head resists the pressure through bending. The stress in this case is proportional to thickness squared. So very roughly speaking, the required reinforcement provides the same increase in strength if you double the thickness of a shell or take 150% of the thickness of a flat head. Thus, reinforcement of an opening on a flat head requires half of the reinforcement of an opening on a shell. Before we get off debating the details, keep in mind that the concept of area replacement can be debated ad infenatum.
jt
RE: REINFORCEMENT OF OPENING ON FLAT HEAD
prex
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RE: REINFORCEMENT OF OPENING ON FLAT HEAD
htt
RE: REINFORCEMENT OF OPENING ON FLAT HEAD
I am trying to compare the area required by UG34(c) and UG39(b)1
RE: REINFORCEMENT OF OPENING ON FLAT HEAD
Cheers,
gr2vessels