Finding global stiffness using abaqus

[ssn3]

Is there a way to find the global stiffness of the laminate for a given structure? I have defined a panel with sections of orthotropic material. I wanted to know if there is a way to obtain a global stiffnes in a particular direction for a structure with different orthotropic materials and orientations.

 

[IceBreakerSours]

What do you mean by "global stiffness"? Do you mean to find out, say, RF1/U1 etc. in the Viewer?

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[ssn3]

Sorry if I was not clear enough. Lets say I have a composite for example with different plies stacked up. Since each ply has its own stiffnes (E1,E2,E3) and orthotropic the laminate itself can be estimated with a laminate stiffnes. In this case there will only be 1 set of E1,E2 and E3 for the whole laminate instead of having individual stiffnes for the different plies.

 

[ssn3]

Basically I am talking about the modulus in the 1,2 and 3 direction. I guess I should not have used the term stiffness.

 

[IceBreakerSours]

Okay. Well, like I said, you could use nodal output (displacement and reaction force) out of a reference node that is constrained (equation) to the nodes of interest. Then, in the Viewer, you may plot RFi/Ui to get your stiffness.

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[ssn3]

If I were to use composite layups to set up my laminate is there an easier way to get the stiffness of the laminate?