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zhankeliu (Mechanical) (OP)
17 Jan 07 23:48
I want to model a spring and dashpot in series between two nodes. It is easy to define them in parallel, but hard in series. Does anyone have idea about this? THANKS!
brep (Mechanical)
18 Jan 07 8:42
Use 2 connector elements in series. Put spring behavior on one and damper on the other. (within a single connector section multiple behaviors will act in parallel)

Connectors are by far the most powerful and flexible modeling construct - check out the available behaviors...
zhankeliu (Mechanical) (OP)
18 Jan 07 10:09
Thanks, Brep. It seems to me that one connector element should be between two nodes or ground and a node. Currently, I have only two nodes, and I want to put two connector elements in series, to model a spring and a dashpot in series between these two nodes. This seems difficult for me.
bassmanjax (Mechanical)
18 Jan 07 10:14
Put a node between the two existing nodes and use two connectors, as brep says.

x----||-----x--/\/\/\---x

If you want the nodes to stay colinear, you could use *COUPLING and *KINEMATIC to tie the relevant degrees of freedom.

Regards

Martin
zhankeliu (Mechanical) (OP)
18 Jan 07 10:23
Thanks, Martin. Should the added node between the two existing nodes have mass? If yes, then how much should the mass be? I actually tried this scheme. I got an error message if I add the node without mass. Then I assigned an extremely small point mass to the middle node and I got funny results. I am wondering if we can have a node without mass in ABAQUS.
bassmanjax (Mechanical)
18 Jan 07 10:37
Depends what sort of analysis you're trying to do.  If you are trying to solve a dynamic problem in Explicit, then you will definitely need a mass.

What type of analysis are you trying to do and what are you trying to model?
zhankeliu (Mechanical) (OP)
18 Jan 07 10:42
Thanks, Martin. It is right on the point.

I am trying to model the transient behavior of mass-spring-damper system subject to transient loading. The simple mass-spring-damper system I am adopting now is the Maxwell model (which is two point masses connected by a spring and a dashpot in series).

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