CR4® - The Engineer's Place for News and Discussion®


Previous in Forum: Is Mechatronics Different From Robotics?   Next in Forum: Difficulties With Half Skirt Calculations
Close
Close
Close
21 comments
Associate

Join Date: Jul 2008
Posts: 40

Sheet Metal Thickness

06/11/2018 5:33 PM

Dear All,

I have one question that is bothering me. Regarding choosing the appropriate thickness of sheet metal for the below construction.

I am not sure or to choose between 3mm or 5mm thickness. The material is S235JR (1.0037). Below is a picture of the construction. Both valves have a weight in total of 100kg

Could somebody give me some suggestion which thickness of sheet metal should I choose?

Thank you very much for your reply

Register to Reply
Pathfinder Tags: Sheet metal thickness
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Comments rated to be Good Answers:

These comments received enough positive ratings to make them "good answers".

Comments rated to be "almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, rate them!
3
Guru

Join Date: Oct 2008
Posts: 41214
Good Answers: 1617
#1

Re: Sheet metal thickness

06/11/2018 5:37 PM

When in doubt, build it stout.

5mm.

Register to Reply Good Answer (Score 3)
Guru
Engineering Fields - Mechanical Engineering - New Member Fans of Old Computers - TRS-80 - New Member Popular Science - Weaponology - New Member Safety - Hazmat - New Member Hobbies - Fishing - New Member United States - Member - New Member

Join Date: Apr 2012
Location: Detroit MI, USA
Posts: 2355
Good Answers: 245
#2
In reply to #1

Re: Sheet metal thickness

06/11/2018 5:51 PM

I have to agree, 5mm for me.

__________________
How we deal with death is at least as important as how we deal with life. --CAPTAIN KIRK, Star Trek II: The Wrath of Khan
Register to Reply
Guru
Engineering Fields - Mechanical Engineering - New Member Hobbies - CNC - New Member

Join Date: Aug 2006
Location: Western Australia
Posts: 629
Good Answers: 48
#4
In reply to #1

Re: Sheet metal thickness

06/12/2018 3:24 AM

When in doubt, build it stout.

Out of something you know all about

__________________
If you can't explain it simply, you don't understand it well enough. (A.E.)
Register to Reply
Guru

Join Date: Mar 2007
Location: at the beach in Florida
Posts: 21068
Good Answers: 1218
#3

Re: Sheet metal thickness

06/11/2018 6:26 PM

This depends on the design load of the constructed item, the material being transported and design life target...Why is it between 3 and 5 mm? You must have had some criteria to consider in making the judgement...

__________________
Life is like riding a bicycle. To keep your balance you must keep moving. A.E.
Register to Reply
Guru
Hobbies - CNC - New Member Hobbies - DIY Welding - New Member Engineering Fields - Electromechanical Engineering - New Member

Join Date: Aug 2007
Posts: 20178
Good Answers: 363
#5

Re: Sheet Metal Thickness

06/12/2018 8:02 AM

with the information giving and with the overhung loads 5mm looks to be better suited... is it going to be supported on both other ends?

also, I'd be concerned about the rectangular flange thickness also.

__________________
phoenix911
Register to Reply Score 1 for Good Answer
Guru

Join Date: Mar 2012
Location: Out of your mind! Not in sight!
Posts: 4220
Good Answers: 99
#6

Re: Sheet Metal Thickness

06/12/2018 9:47 AM

Is there flow going through that contraption?

What is the environment this is in? How much allowance for corrosion is there?

5 mm maybe not enough!

__________________
Common Sense Dictates
Register to Reply
Power-User

Join Date: Aug 2007
Location: Queensland, Australia.
Posts: 152
Good Answers: 4
#7

Re: Sheet Metal Thickness

06/12/2018 10:46 PM

Its modelled in 3D. Can you run a FEA?

__________________
Fish dont know they're underwater.......think.
Register to Reply
Guru
Canada - Member - New Member

Join Date: Jul 2013
Location: Canada but south of 49
Posts: 809
Good Answers: 19
#13
In reply to #7

Re: Sheet Metal Thickness

06/13/2018 8:27 AM

That would be the best thing to do as it appears not to be just your ordinary shape. Also, factor in any live loads (material moving, valves operating) that may happen along with the dead load already given. No idea of how often the valves will cycle either, so, if in constant use, there may be a possibility of fatigue as well which would affect material grade and thickness.

__________________
Never stop learning
Register to Reply
Guru

Join Date: Aug 2005
Location: Hemel Hempstead, UK
Posts: 4328
Good Answers: 245
#8

Re: Sheet Metal Thickness

06/13/2018 5:13 AM

How many are going to be built?

Is the "production" cost difference between 3mm and 5mm going to be significant.

__________________
We are alone in the universe, or, we are not. Either way it's incredible... Adapted from R. Buckminster Fuller/Arthur C. Clarke
Register to Reply
Power-User

Join Date: Nov 2011
Location: NASA-Glenn Research Center, Cleveland Ohio
Posts: 131
Good Answers: 8
#9

Re: Sheet Metal Thickness

06/13/2018 6:47 AM

The sheet metal needs to be strong enough to keep form from the vacuum inside the duct.There should be structural members such as extruded aluminium or angle iron to support the weight of the valves ect.

I do not understand why this has not been addressed?

Register to Reply
Guru
Hobbies - CNC - New Member Hobbies - DIY Welding - New Member Engineering Fields - Electromechanical Engineering - New Member

Join Date: Aug 2007
Posts: 20178
Good Answers: 363
#10
In reply to #9

Re: Sheet Metal Thickness

06/13/2018 7:34 AM

yep, something to be thinking about...

I do not understand why this has not been addressed?

more then likely,... because none of us have been in the meetings and are only doing it when we can fit it in. i.e. shooting from the hip.

__________________
phoenix911
Register to Reply
Power-User

Join Date: Nov 2011
Location: NASA-Glenn Research Center, Cleveland Ohio
Posts: 131
Good Answers: 8
#11
In reply to #10

Re: Sheet Metal Thickness

06/13/2018 7:53 AM

I'm sorry i didn't mean any harm. should not have said it that way.

Register to Reply
Guru
Hobbies - CNC - New Member Hobbies - DIY Welding - New Member Engineering Fields - Electromechanical Engineering - New Member

Join Date: Aug 2007
Posts: 20178
Good Answers: 363
#12
In reply to #11

Re: Sheet Metal Thickness

06/13/2018 8:00 AM

no harm done that I can see. as far as how its said... unintentionally, I also had an edge to it.

__________________
phoenix911
Register to Reply
Member

Join Date: Jan 2018
Posts: 9
#14

Re: Sheet Metal Thickness

06/13/2018 8:57 AM

Also to be considered is the environment it is to be installed in. Consider potential damage from surrounding activities. Is a stout enclosure part of the plan?

Register to Reply
Guru

Join Date: Oct 2007
Location: Tulare, CA
Posts: 1770
Good Answers: 35
#15

Re: Sheet Metal Thickness

06/13/2018 9:45 AM

220lbs, The 3mm should work just fine, that's equivalent to 10 gauge, that's plenty.

__________________
Why is there never enough time to do it right the first time but always enough time to do it over?
Register to Reply
Guru
Hobbies - CNC - New Member Hobbies - DIY Welding - New Member Engineering Fields - Electromechanical Engineering - New Member

Join Date: Aug 2007
Posts: 20178
Good Answers: 363
#16
In reply to #15

Re: Sheet Metal Thickness

06/13/2018 10:21 AM

as to 7 gage, I would normally agree,... but its difficult with the information supplied.

__________________
phoenix911
Register to Reply
Guru

Join Date: Oct 2014
Location: Hemet, Land of milk and honey.
Posts: 1772
Good Answers: 27
#17

Re: Sheet Metal Thickness

06/13/2018 10:32 AM

When you say, " metal " can you be more specific ?

Metal is a generic term.

Aluminum and steel are both metal (s).

Register to Reply
Power-User

Join Date: Feb 2007
Location: Aberdeen, Scotland
Posts: 375
Good Answers: 19
#18

Re: Sheet Metal Thickness

06/14/2018 2:41 AM

What I always say in this type of question is firstly start with a free body diagram for all the load cases you can see this will experience. From that you'll get an understanding of where the critical areas are and you can then simplify the geometry to enable you to do hand calculations (bending, torsion, shear....whatever).

You can then compare these results with whatever allowable stresses, strains etc. you derive from whatever standard you choose to use. If it is acceptable then that is it, if it fails you can either redesign it or choose to do FEA, in most instances if your hand calcs show a marginal fail, FEA will show a pass as it is less conservative (in general).

Then after you have done that and someone questions why you designed it that way you can show a logical design process which, with the information you had at the time, led you to choose that design. Or you could just ask here and we'll all tell you random answers!

Register to Reply Score 1 for Good Answer
Participant

Join Date: Jun 2018
Posts: 2
#19

Re: Sheet Metal Thickness

06/18/2018 7:57 AM

hi

you must count the volume of your sheetmetal base.

And do distribute the total load to your volume of cone (exclude the base plate).

find the yield strength of S235JR with 3mm plate from standard data from any engineering book or reference. If it is more ...you are safe.

Register to Reply
Power-User

Join Date: Feb 2007
Location: Aberdeen, Scotland
Posts: 375
Good Answers: 19
#20
In reply to #19

Re: Sheet Metal Thickness

06/18/2018 8:16 AM

Can you confirm how you came to this conclusion? Firstly why are you calculating a volume? What stress are you trying to calculate?

Next, you are applying what load to this volume? Is this load in compression, tension, shear?

The yield strength of the material is the same regardless of how thick the plate is.

And would you not want to work to a recognised standard which perhaps has allowables? I know in my job I can't justify designing something up to yield strength.

Register to Reply Score 1 for Good Answer
Power-User
India - Member - New Member

Join Date: Jan 2009
Posts: 112
#21

Re: Sheet Metal Thickness

08/10/2018 1:36 AM

Go in for 5mm sheet

Register to Reply
Register to Reply 21 comments
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Comments rated to be Good Answers:

These comments received enough positive ratings to make them "good answers".

Comments rated to be "almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, rate them!
Copy to Clipboard

Users who posted comments:

cadcam (1); claritysable (1); Govind Rao (1); IdeaSmith (1); Janissaries (1); JPool (1); Kevin LaPaire (1); lyn (1); MACA (2); Mfmatusky (1); phoenix911 (4); Randall (1); setlock77 (2); SolarEagle (1); The Prof (1); tonyhemet (1)

Previous in Forum: Is Mechatronics Different From Robotics?   Next in Forum: Difficulties With Half Skirt Calculations

Advertisement