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1-Newbie

## 3 layers shell model

How to include the weight of a model in a static analysisHi everybody,

I' have to simulate (Mechanica structure) a plastic part which is made of a shell of 3 plastic layers.

All the part is a plastic shell (I assume a constant thickness) like kids garden games, dustbins...

The particular point of this project is that the shell is made of 3 differents plastic layers :
inner : Polyurethane
midlle : Polyurethane foam
outer : Polyurethane

So, I don't know how to handle this.

1/ Equivalent material
I thought about make a machanica square model made of 3 layers of plastics and compare with a classical material in sames conditions and adjust the "equivalent classical material" for having sames results than 3 layers model.

2/ Using composite materials idealisation
In this cas that should be more simple than real composite (3 layers of isotrope and homogeneous material), I don't know how to do with ProE.

So :
Any tutorial,
Any other method ???

Thanks a lot for any advice,
GB

-
2 REPLIES 2
1-Newbie
(To:gbon)
How to include the weight of a model in a static analysisMr Bon (What is
your full name? And who/where do you work?)

I'd take this approach if I were you:

1) If the layers are all quite thin - thin use the laminate layup method.
This means you need to start with a shell model - either my shell
compressing or by applying shell props to surfaces). Instead of using a
normal homogeneous thickness property you can change this to be a laminate
layup. Then you just define the material properties, thickness and
orientation of the 3 layers. Obviously orientation is only really necessary
if you have non-isotropic materials.

Search the KDB for 'laminate' - and you'll get lots of results e.g.
1-Newbie
(To:gbon)
Hello David,

Wonder if the cylindrical coordinate system will work in defining the
material orientation for the laminate layup method.

Thanks.

Byung Hak Lee
Simulation Specialist
Technology Group
Entegris, Inc.
101 Peavey Rd.
(Ph) 952-556-4409
(Cell) 952-221-1197
(Fx) 952-556-8023

The materials integrity management company
www.entegris.com

"David Reid" <davidr@optima-design.co.uk>
Sent by: -
09/22/2006 05:04 AM
"David Reid" <davidr@optima-design.co.uk>

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"PTC/USER Simulation and Behavioral Modeling Discussion"
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Subject
[sim] RE: 3 layers shell model

Mr Bon (What is your full name? And who/where do you work?)

I'd take this approach if I were you:

1) If the layers are all quite thin - thin use the laminate layup method.
This means you need to start with a shell model - either my shell
compressing or by applying shell props to surfaces). Instead of using a
normal homogeneous thickness property you can change this to be a laminate
layup. Then you just define the material properties, thickness and
orientation of the 3 layers. Obviously orientation is only really
necessary if you have non-isotropic materials.

Search the KDB for 'laminate' - and you'll get lots of results e.g.
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