curved fibre material orientation

[legalise_potticus]

Hi there,

I'm modelling 3D woven composite materials, and need to define orientations
for the orthotropic fibre parts. It's easy enough when the fibre are
orientated in straight lines as I just use a defined co-ord system etc, but
I don't know how to make it work for fibres which follow a curved/spline
path, weaving in and out of the other ones.

I think i might be able to do it with *orient and distributions, but haven't
really got a clue where to start.

Thanks very much for your help,
Emily

[BenZ]

Sarch the forum, there was a topic on that 2 weeks ago.

benz

Post by legalise_potticus
Hi there,
I'm modelling 3D woven composite materials, and need to define

orientations

Post by legalise_potticus
for the orthotropic fibre parts. It's easy enough when the fibre are
orientated in straight lines as I just use a defined co-ord system etc, but
I don't know how to make it work for fibres which follow a

curved/spline

Post by legalise_potticus
path, weaving in and out of the other ones.
I think i might be able to do it with *orient and distributions, but haven't
really got a clue where to start.
Thanks very much for your help,
Emily

[potticus]

BenZ,

I've found that post topic, unfortunately it doesn't cover the situation I've got, as I'm manually generating a square mesh, and don't have a surface I'd like to align my orientations with, infact that would be impossible in this case! The node ordering should be consistent, as I've literally just got a volume of square elements.


To: ***@yahoogroups.comFrom: ***@yahoo.frDate: Thu, 20 Mar 2008 07:47:02 +0000Subject: [Abaqus] Re: curved fibre material orientation




Sarch the forum, there was a topic on that 2 weeks ago.benz--- In ***@yahoogroups.com, legalise_potticus <***@...> wrote:>> Hi there,> > I'm modelling 3D woven composite materials, and need to define orientations> for the orthotropic fibre parts. It's easy enough when the fibre are> orientated in straight lines as I just use a defined co-ord system etc, but> I don't know how to make it work for fibres which follow a curved/spline> path, weaving in and out of the other ones.> > I think i might be able to do it with *orient and distributions, but haven't> really got a clue where to start.> > Thanks very much for your help,> Emily>






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[Non-text portions of this message have been removed]

[BenZ]

Yes it does cover this topic ! There is a tool in /CAE to align all
the orientations of H8 elements based on a master H8 element that
you have to chose. This is very useful, in fact I use only this
feature of /CAE ;)

benz

Post by potticus
BenZ,
I've found that post topic, unfortunately it doesn't cover the

situation I've got, as I'm manually generating a square mesh, and
don't have a surface I'd like to align my orientations with, infact
that would be impossible in this case! The node ordering should be
consistent, as I've literally just got a volume of square elements.
+0000Subject: [Abaqus] Re: curved fibre material orientation

Post by potticus
Sarch the forum, there was a topic on that 2 weeks ago.benz--- In

***@yahoogroups.com, legalise_potticus <potticus@> wrote:>> Hi
there,> > I'm modelling 3D woven composite materials, and need to
define orientations> for the orthotropic fibre parts. It's easy
enough when the fibre are> orientated in straight lines as I just
use a defined co-ord system etc, but> I don't know how to make it
work for fibres which follow a curved/spline> path, weaving in and
out of the other ones.> > I think i might be able to do it with
*orient and distributions, but haven't> really got a clue where to
start.> > Thanks very much for your help,> Emily>

Post by potticus
_________________________________________________________________
Share what Santa brought you
https://www.mycooluncool.com
[Non-text portions of this message have been removed]

[BROWN Greg]

In fact there are many (more) tools in Abaqus that can help with this. One method you should look into is the "Discrete Field Toolset" (Section 45 of the V6.7EF Abaqus/CAE User's Manual). Many different properties, fields, loads, BCs, and importantly for your case, orientations can be controlled using such discrete fields. They invoke the *DISTRIBUTION keyword, for those of you interested in the inp syntax... Note that you would be likely to generate your discrete fields programmatically using your own python scripts (or whatever you choose to do it in), rather than type in the element-by-element orientations manually!

Greg



PS: If you are so inclined, it is possible to generate a discrete field and apply it to modulate a gravity load (giving an element by element modulation of gravity magnitude?!) . If anyone can come up with a practical application for this, then some dev guys here would love to see it!





Cordialement / Best regards,

________________________________



Greg BROWN
SIMULIA Product Management
Office: [phone]
Mobile: [phone]
***@3ds.com <mailto:***@3ds.com>
Dassault Systèmes | www.3ds.com <http://www.3ds.com>

Visit us at: www.simulia.com <http://www.simulia.com>
SIMULIA - Dassault Systemes Simulia Corp. 166 Valley Street, Providence, RI 02909 - USA





[Non-text portions of this message have been removed]

[BenZ]

Many thx Greg !! I'll give a look at this new card with lot's of
interest !!

benz

Post by BROWN Greg
In fact there are many (more) tools in Abaqus that can help with

this. One method you should look into is the "Discrete Field
Toolset" (Section 45 of the V6.7EF Abaqus/CAE User's Manual). Many
different properties, fields, loads, BCs, and importantly for your
case, orientations can be controlled using such discrete fields.
They invoke the *DISTRIBUTION keyword, for those of you interested
in the inp syntax... Note that you would be likely to generate your
discrete fields programmatically using your own python scripts (or
whatever you choose to do it in), rather than type in the element-by-
element orientations manually!

Post by BROWN Greg
Greg
PS: If you are so inclined, it is possible to generate a discrete

field and apply it to modulate a gravity load (giving an element by
element modulation of gravity magnitude?!) . If anyone can come up
with a practical application for this, then some dev guys here would
love to see it!

Post by BROWN Greg
Cordialement / Best regards,
________________________________
Greg BROWN
SIMULIA Product Management
Office: [phone]
Mobile: [phone]
Dassault Systèmes | www.3ds.com <http://www.3ds.com>
Visit us at: www.simulia.com <http://www.simulia.com>
SIMULIA - Dassault Systemes Simulia Corp. 166 Valley Street,

Providence, RI 02909 - USA

Post by BROWN Greg
[Non-text portions of this message have been removed]

[jeffergj]

Square? 2D ? In any case to reference nodes your elements not only
need consistent node ordering but they need to be aligned with the
material axis. That may well be the case if you've meshed the fiber so
that the elements are swept along an axial path. If the elements are
not nicely aligned use a user subroutine (also discussed in the other
thread).

Post by BROWN Greg
In fact there are many (more) tools in Abaqus that can help with

this. One method you should look into is the "Discrete Field Toolset"
(Section 45 of the V6.7EF Abaqus/CAE User's Manual). Many different
properties, fields, loads, BCs, and importantly for your case,
orientations can be controlled using such discrete fields. They invoke
the *DISTRIBUTION keyword, for those of you interested in the inp
syntax... Note that you would be likely to generate your discrete
fields programmatically using your own python scripts (or whatever you
choose to do it in), rather than type in the element-by-element
orientations manually!

Post by BROWN Greg
Greg
PS: If you are so inclined, it is possible to generate a discrete

field and apply it to modulate a gravity load (giving an element by
element modulation of gravity magnitude?!) . If anyone can come up
with a practical application for this, then some dev guys here would
love to see it!

Post by BROWN Greg
Cordialement / Best regards,
________________________________
Greg BROWN
SIMULIA Product Management
Office: [phone]
Mobile: [phone]
Dassault Systèmes | www.3ds.com <http://www.3ds.com>
Visit us at: www.simulia.com <http://www.simulia.com>
SIMULIA - Dassault Systemes Simulia Corp. 166 Valley Street,

Providence, RI 02909 - USA

Post by BROWN Greg
[Non-text portions of this message have been removed]

[Fernando]

Hi everybody,

Post by BROWN Greg
PS: If you are so inclined, it is possible to generate a discrete

field and

Post by BROWN Greg
apply it to modulate a gravity load (giving an element by element
modulation of gravity magnitude?!) . If anyone can come up with a
practical application for this, then some dev guys here would love

to see

Post by BROWN Greg
it!

Maybe not gravity, but definitely body loads! Take for example
next-generation elastomers, embedded with ferromagnetic particles
(they find applications in "intelligent" dampeners, for example):
depending on an externally applied electromagnetic field, the
elastomer changes its stiffness. So having the possibility to study
non-uniform particle density distributions might be of interest for
the industry.

Just my 2 cent...

Fernando

[Crookston Jonathan]

Hi Emily,

*DISTRIBUTION is definitely a good way to do this in my experience. It
also allows the orientation data to be written into a separate file
(using the INPUT parameter) so that it doesn't clog up the input deck.
If you have some way of calculating your orientations, then personally I
would definitely proceed with this.

Which institution are you working at, out of interest?

Jon.

-----Original Message-----
On Behalf Of legalise_potticus
Sent: 19 March 2008 17:29
Subject: [ABAQUS] curved fibre material orientation
Hi there,
I'm modelling 3D woven composite materials, and need to
define orientations for the orthotropic fibre parts. It's
easy enough when the fibre are orientated in straight lines
as I just use a defined co-ord system etc, but I don't know
how to make it work for fibres which follow a curved/spline
path, weaving in and out of the other ones.
I think i might be able to do it with *orient and
distributions, but haven't really got a clue where to start.
Thanks very much for your help,
Emily
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