Discussion Groups

Simulation Mechanical and Multiphysics

Reply
Distinguished Contributor
madg1
Posts: 108
Registered: ‎03-16-2012
Accepted Solution

plate element thickness

777 Views, 7 Replies
02-25-2013 11:16 AM

if a meshed plate with plate elemnts got say 3 elements across the thickness.....then what would be the element thickness. if iam meshing 1 inch thick plate.....what would be element thickenss....1/3??

madg1
ASIMM 2012
Please use plain text.
*Expert Elite*
AstroJohnPE
Posts: 573
Registered: ‎08-30-2012

Re: plate element thickness

02-25-2013 12:27 PM in reply to: madg1

Hi madg1,

 

Something does not sound right in your question. Perhaps you are confusing the suggestion of "multiple layers of brick elements through the thickness" with multiple plate elements.

 

Because it can get confusing when talking about plate elements to represent a steel "plate", let me use the words "steel slab" instead of the steel plate.

 

The plate element mesh must represent the entire thickness of the slab. You do not need to use multiple plate elements through the thickness of the slab. Perhaps the descriptions on the pages "Model Mesh Settings" (3 figures on the page) and "Plate Elements" (Figure 1) will help to explain the concept -- assuming that you are starting from a CAD model.

 

If you were to mesh the slab with 3 plate elements through the thickness, you would be representing 3 slabs sitting on top of each other. But the 3 layers of plate elements would not be connected together, so they would be able to move independent of each other. I have attached some crude images to try to clarify my explanation.

John Holtz, PE
Mechanical Engineer
Pittsburgh, PA

Simulation Mechanical user since Dec 1997
Please use plain text.
Distinguished Contributor
madg1
Posts: 108
Registered: ‎03-16-2012

Re: plate element thickness

02-25-2013 01:56 PM in reply to: AstroJohnPE

what happens if i put a refinement point at one node.....it will become multiple element thick right>?

madg1
ASIMM 2012
Please use plain text.
Distinguished Contributor
madg1
Posts: 108
Registered: ‎03-16-2012

Re: plate element thickness

02-26-2013 12:11 PM in reply to: AstroJohnPE

Hello john see the image.

the red coloroed plate is defined as plate and meshed as plate.but if you see cross the thickness you can see multiple elemnts.......i crosschecked every thing...its just one plate...

image

 

 

madg1
ASIMM 2012
Please use plain text.
Distinguished Contributor
madg1
Posts: 108
Registered: ‎03-16-2012

Re: plate element thickness

02-26-2013 12:12 PM in reply to: madg1

image

madg1
ASIMM 2012
Please use plain text.
*Expert Elite*
AstroJohnPE
Posts: 573
Registered: ‎08-30-2012

Re: plate element thickness

02-27-2013 02:49 PM in reply to: madg1

Hi,

 

What I see is a large plate/slab of material that was bent to form an "L" shape: the red item (surface?) is the long leg of the "L", and the blue item (surface?) is the short leg of the "L". The blue item does not represent the thickness of the red part; not when both are defined with an element type of "Plate".

 

Just do a Check Model ("Analysis > Analysis > Check Model") and slice the model ("Results Options > Slice Planes > Add Slice Plane > pick one that gives a view similar to the attached sketch).

 

Another way to see what you are modeling when working with plate elements is to select the part(s) in the Results environment, right-click, and choose "3D Visualization". This will show the thickness of the plates. What you see is what you have modeled. If it matches the physical structure, then you are okay.

 

 

John Holtz, PE
Mechanical Engineer
Pittsburgh, PA

Simulation Mechanical user since Dec 1997
Please use plain text.
Distinguished Contributor
madg1
Posts: 108
Registered: ‎03-16-2012

Re: plate element thickness

02-28-2013 08:10 AM in reply to: madg1

thank you john

madg1
ASIMM 2012
Please use plain text.
*Expert Elite*
AstroJohnPE
Posts: 573
Registered: ‎08-30-2012

Re: plate element thickness

03-05-2013 03:43 PM in reply to: madg1

Hello Everyone,

 

Just in case there is any confusion, whether now or in the future, I created the attached paper to describe the different mesh types (solid, midplane, plate/shell) and when to use each one. Any feedback would be welcomed, either privately or in this thread.

 

In another thread, Sualp posted this link to a great video that also describes the different mesh types. If you are using midplane or plate/shell mesh type for the first time, I highly recommend you watch the video. (If I had watched it before creating the attached paper, I probably would not have created it. :smileyindifferent:)

 

John Holtz, PE
Mechanical Engineer
Pittsburgh, PA

Simulation Mechanical user since Dec 1997
Please use plain text.