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Sol 101 contact


I have been trying determine if it is possible to model contact using Sol 101 for
a stack of three plates modeled as shell elements at each plate's mid surface.
I have using a BCTSET card with two contact sets, each set includes the elements
in the center plate. My models will solve, but the results indicate contact only
between two of the plates.
Does anyone have any ideas on how to do this, or whether it is possible in SOl 101?
Using NX Nastran 5.1
2 REPLIES

Re: Sol 101 contact


"Dan McConaughy" wrote:
>
>
>
>I have been trying determine if it is possible to model contact using Sol
>101 for
>a stack of three plates modeled as shell elements at each plate's mid surface.
>
>I have using a BCTSET card with two contact sets, each set includes the elements
>in the center plate. My models will solve, but the results indicate contact
>only
>between two of the plates.
>
>Does anyone have any ideas on how to do this, or whether it is possible in
>SOl 101?
>
>Using NX Nastran 5.1

Dan,
This should be possible. You will have to define 4 contact regions via BSURF/BCPROP
and the shell top/bottom surfaces on BCRPARA. The elements on the middle plate will
be defined in two of these. The entries will be duplicate, just with a different
ID number.
Assuming that the top plate is region 1, the middle plate is defined as region 2
and 3, and the bottom plate is region 4, and that the connectivity of the shells
is such that all of the element normals are aligned with the +Z axis, then your
definition will be similar to:
BCRPARA 1 BOT
BCRPARA 2 TOP
BCRPARA 3 BOT
BCRPARA 4 TOP
BCTSET 100 1 2 +
+ 4 3
I'm setting the two regions defining the middle plate as the target for each contact
pair.
Regards,
Jim

Re: Sol 101 contact


"Jim Bernard" wrote:
>
>"Dan McConaughy" wrote:
>>
>>
>>
>>I have been trying determine if it is possible to model contact using Sol
>>101 for
>>a stack of three plates modeled as shell elements at each plate's mid surface.
>>
>>I have using a BCTSET card with two contact sets, each set includes the elements
>>in the center plate. My models will solve, but the results indicate contact
>>only
>>between two of the plates.
>>
>>Does anyone have any ideas on how to do this, or whether it is possible in
>>SOl 101?
>>
>>Using NX Nastran 5.1

>
>Dan,
>
>This should be possible. You will have to define 4 contact regions via BSURF/BCPROP
>and the shell top/bottom surfaces on BCRPARA. The elements on the middle plate
>will
>be defined in two of these. The entries will be duplicate, just with a different
>ID number.
>
>Assuming that the top plate is region 1, the middle plate is defined as region
>2
>and 3, and the bottom plate is region 4, and that the connectivity of the
>shells
>is such that all of the element normals are aligned with the +Z axis, then
>your
>definition will be similar to:
>
> BCRPARA 1 BOT
> BCRPARA 2 TOP
> BCRPARA 3 BOT
> BCRPARA 4 TOP
> BCTSET 100 1 2
>+
> + 4 3
>
>I'm setting the two regions defining the middle plate as the target for each
>contact
>pair.
>
>Regards,
>Jim
Jim,
Thanks - that worked just as you said.
Regards,
Dan McConaughy