Spring and dashpot in series Spring and dashpot in series 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! RE: Spring and dashpot in series brep (Mechanical) 18 Jan 07 08:42 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... RE: Spring and dashpot in series 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. RE: Spring and dashpot in series bassmanjax (Mechanical) 18 Jan 07 10:14 Put a node between the two existing nodes and use two connectors, as brep says.x----||-----x--/\/\/\---xIf you want the nodes to stay colinear, you could use *COUPLING and *KINEMATIC to tie the relevant degrees of freedom.RegardsMartin RE: Spring and dashpot in series 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. RE: Spring and dashpot in series 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? RE: Spring and dashpot in series 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).