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ROARKS table 11.4

ROARKS table 11.4

ROARKS table 11.4

(OP)
I have a question about the a/b ratio in table 11.4 of Roarks Formulas 7th edition.
I want to use Table 11.4, Case 8d for an decreasing load along the height but my a/b ratio is more than 2. The a/b ratio for this case stops at 2. Can I still use the table???
Case 8a, for instance, also gives values for "infinite" ratio.

Can someone please help me with my question.

Regards,
Gert Kroon

RE: ROARKS table 11.4

For the load cases on a rectangular plate supported on all edges, as the plate width increases, the behavior will approach that of a beam spanning the short direction. Check the stress on that basis and see how it compares to the last value in the table.

For calculating deflections for the beam/infinite case, there is a 1/(1-nu^2) factor that enters in, applicable to "wide" beams where the compression and tension faces are not free to expand/contract laterally.

RE: ROARKS table 11.4

you could see what Roark's reference says.

you could use a strip, 1" wide, as a beam, as mentioned above, which should be conservative.

another day in paradise, or is paradise one day closer ?

RE: ROARKS table 11.4

(OP)
Thanks for the reactions.
I will see if this approach helps me.

Gert

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