Re: Re: complex eigenvalue vs transient analysis

Hi Benz.

In explicit there are only a few element type available. For both
analyses I used a same model(nodes and element)and same contact
algorithm but different type of element(C3D8-implicit and
C3D8R--explicit). I have to use c3d8 in the example because I used
similar type of element for a disc brake model which has quite
complicated shape. 


cheers
rahim




--- BenZ <benjamin_hagege@xxxxxxxx> wrote:

> 
> Hum, that's an old debate ! You can use many C3D8R or few C3D20(R),
> 
> that's a choice linked to the presence of contact. In this case, a 
> block is sliding so trilinear elements must be used !!!
> About your parametric study, in that i'm interested, was it done at
> :
> *constant number of nodes
> *constant number of elements
> *constant number of Gauss points ?
> 
> Thx !
> 
> BenZ.
> 
> PS: avoid the C3D8 if there are deformation modes that are not 
> tension/compression (shearing/bending locking effects...)
> 
> --- In ABAQUS@xxxxxxxxxxxxxxx, Ibrahim iflefel <rafal385@xxxx>
> wrote:
> > 
> > Hi Abd. Rahim,
> > Try to use element type C3D20R which more accurate than C3D8. I 
> have done  parameter study showed that element C3D8 gives low 
> accurace compared with C3D20R.
> > Good Luck
> > Ibrahim
> > 
> > "Abd. Rahim" <abdrahim_abubakar@xxxx> wrote:
> > 
> > 
> > Dear all.
> > 
> > I am studying disc brake squeal. In the past, I used the complex
> > eigenvalue analysis to predict squeal occurrence. I am also
> > interested to simulate squeal using dynamic transient analysis. 
> > 
> > In order to compare the two methods, I run an example of
> deformable
> > block sliding on the deformable base which is rigidly constraints
> at
> > the bottom.The block is sliding at certain velocity. For the
> complex
> > eigenvalue analysis, I used first order brick/solid element
> i.e.C3D8
> > while C3D8R for explicit(transient analysis). Unfortunately, the
> > results I got from the two analyses is not well correlated. I 
> assumed
> > that results from the complex eigenvalue more reliable than the
> > transient analysis. Does anyone know how to improve it? What are
> the
> > criteria to get more accurate results in the transient analysis?
> > 
> > Thanks
> > 
> > Rahim
> > 
> > =====
> > ABD. RAHIM ABU BAKAR
> > ***************************
> > OFFICE:
> > Department of Engineering
> > The University of Liverpool
> > Brownlow Street
> > L69 3GH
> > Liverpool
> > United Kingdom
> > Mobile :07817933465
> > Email: arahim@xxxx
> > ***************************
> > 
> > 
> > 
> > __________________________________
> > Do you Yahoo!?
> > Take Yahoo! Mail with you! Get it on your mobile phone.
> > http://mobile.yahoo.com/maildemo 
> > 
> > 
> > 
> > 
> > 
> > 
> > Community email addresses:
> > Post message: ABAQUS@xxxxxxxxxxxxxxx
> > Subscribe: ABAQUS-subscribe@xxxxxxxxxxxxxxx
> > Unsubscribe: ABAQUS-unsubscribe@xxxxxxxxxxxxxxx
> > List owner: ABAQUS-owner@xxxxxxxxxxxxxxx
> > 
> > Shortcut URL to this page:
> > http://groups.yahoo.com/group/abaqus 
> > Yahoo! Groups Links
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > Send instant messages to your online friends 
> http://uk.messenger.yahoo.com 
> > 
> > [Non-text portions of this message have been removed]
> 
> 
> 
> 


=====
ABD. RAHIM ABU BAKAR
***************************
OFFICE:
Department of Engineering
The University of Liverpool
Brownlow Street
L69 3GH
Liverpool
United Kingdom
Mobile :07817933465
Email: arahim@xxxxxxxxxxxxxxx
***************************


                
__________________________________
Do you Yahoo!?
Yahoo! Mail Address AutoComplete - You start. We finish.
http://promotions.yahoo.com/new_mail 





------------------------ Yahoo! Groups Sponsor --------------------~--> 
Make a clean sweep of pop-up ads. Yahoo! Companion Toolbar.
Now with Pop-Up Blocker. Get it for free!
http://us.click.yahoo.com/L5YrjA/eSIIAA/yQLSAA/PMYolB/TM
--------------------------------------------------------------------~->