Re: complex eigenvalue vs transient analysis

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
> 
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