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C. Schuecker, C.G. Dávila, H. E. Pettermann:
"Modeling the Non-Linear Response of Fiber-Reinforced Laminates Using a Combined Damage/Plasticity Model";
Bericht für National Aeronauticas and Space Administration, Washington, DC; Berichts-Nr. NASA/TM-2008-215314, 2008; 25 S.

The present work is concerned with modeling the non-linear response of fiber reinforced
polymer laminates. Recent experimental data suggests that the non-linearity
is not only caused by matrix cracking but also by matrix plasticity due to shear
stresses. To capture the effects of those two mechanisms, a model combining a
plasticity formulation with continuum damage has been developed to simulate the
non-linear response of laminates under plane stress states. The model is used to
compare the predicted behavior of various laminate lay-ups to experimental data
from the literature by looking at the degradation of axial modulus and Poisson´s
ratio of the laminates. The influence of residual curing stresses and in-situ effect on
the predicted response is also investigated.
It is shown that predictions of the combined damage / plasticity model, in general,
correlate well with the experimental data. The test data shows that there
are two different mechanisms that can have opposite effects on the degradation of
the laminate Poisson´s ratio which is captured correctly by the damage / plasticity
model. Residual curing stresses are found to have a minor influence on the predicted
response for the cases considered here. Some open questions remain regarding the
prediction of damage onset.

http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20080030371_2008027133.pdf

Projektleitung Heinz E. Pettermann:
Simulation von Verbundwerkstoffen und Strukturen