[MBDyn-users] Composite material

Pierangelo Masarati masarati at aero.polimi.it
Mon Aug 24 13:57:38 CEST 2009

Romuald NORET wrote:

> I seen some examples with composite materials with MBDyn, but I didn't 
> find a constitutive law to represent a orthotropic material for instance.
> Can I ask if it is really possible and how can I model those type of 
> materials?

The linear (visco)elastic generic requires a full matrix.  For example, 
if you model a beam, you need to provide 6x6 coefficients (it'd better 
be symmetric, probably :).  Other constitutive laws, including the nlp 
and nlsf ones, allow to have an orthotropic linear relationship 
superimposed to a nonlinear diagonal relationship.

As per how to compute the coefficients for a composite beam section, 
that's an entirely separate business.  You're supposed to have the 
coefficients yourself, typically from some experiment or from some 
sophisticated FEM analysis of orthotropic structural components.

Cheers, p.

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