Roark's formula for square plate

[BMDesign]

Can someone has the Roark's Formula( or link) to find the stresses in square steel plate, supported on four corners with or without hole in the center.

Thanks

 

[Goahead]

You might try the following link

http://www.roarksformulas.com/rytutor.html

http://www.welding-advisers.com/

 

[BMDesign]

Hi goahead,

http://www.roarksformulas.com/rytutor.html

for that link I need to have that software or book. I knew that but I don't want to spent the money as I might not be using it again.
So any free link or access to the formula.

 

[prex]

Look in the site below under Plates -> Simple bending -> Rectangular -> 4 corners. See thread404-117310 for the hole.

prex

http://www.xcalcs.com

Online tools for structural design

 

[JStephen]

If you're designing stuff like that, pay the money and buy the book. It's a goldmine of information on a lot of different situations.

As well as the plate formulas, you need definition of constants, definition of edge conditions, etc., which are also given in the book.

 

[monkeydog]

BMDesign,
If you go to "Google" and type in "roark's formulas", and select the second link that will give you Roark's book.

 

[Cockroach]

JStephen....well said! This is the exact thought I had reading the various replies.

Everybody questions the price of getting a design right. As a professional, BMDesign, work out the cost for getting it wrong! Roark is probably one of the best engineering references going, Mark would be the other.

I echo the sentiment here, make the investment.

Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada

 

[UcfSE]

Books are our tools of the trade. I completely agree with JStephen. If my mason came to work with no trowel or level, carpenter with no hammer, I'd send them home.

 

[ccw]

Hi BMdesign,
Sorry, I cannot find your model case in my Roark (6th ed.), if you mean what you say: square plate with hole supported on the four corners.

As alternatives you could:

1. redesign your part, support, and load so that it fits a case in Roark, then buy the book approx. $60 US used.

-or-

2. find a sharp modeler over on the Solidworks products forum that runs COSMOS, and give him the some of the $60 or a few rounds of Sam Adams to run your model.

 

[GregLocock]

Incidentally, do you understand WHY that load case is not in Roark?



Cheers

Greg Locock

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.

 

[ccw]

Hi Greg,
That is an interesting question. Just guessing, but there are some comments in the Roark 6th Ed Sec.10.10 itself that might be the answer:

1. "No general expression for deflection as a function of position in a plate is given since solutions for plates with straight boundaries are generally obtained numerically ...", or

2. "It is impractical to include plates of all possible shapes and loadings, ...", and "There are many numerical techniques used to solve plate problems...".

Or, if this is a trick question, it may have something to do with Thread404-118635 and WHY manhole covers are round.;-)

 

[GregLocock]

What do you think happens to the stresses in a flat elastic plate (ie no membrane stresses) as you approach the corner which has a perfect simple support?

I'm pretty sure the answer is numerically unpleasant.



Cheers

Greg Locock

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.