Dear All

I am running a model of composite joint to failure in Abaqus. I am using Linear solid elements C3D8 and C3D6. The model contains a composite plate joint to an aluminium plate with a titanium countersunk bolt. I have
modeled all the components of the joint using solid elements. I have also
implemented contact and friction in the model. the joint is fixed at one end and
loaded in tension on the other end.I would like anyone to
help me in reducing the stiffness of the model. The model is being very stiff
compared to the real structure. I am aware of the fact that FEM models are
usually stiffer than the real structure, however my model is too stiff compared
to the real structure.
I am using viscosity to lead to convergence and I am using implicit analysis
in my simulation. My model also has bolt pre-load, contact and friction in the
simulation. I would like anyone to suggest ways to reduce the stiffness of the
model. Please give ideas, how can I reduce the stiffness of the model. Thanking
you in advance.

Regards

Maajid