%AKuksenko, D.%ADrach, B%ATsukrov, I.%BJournal Name: Proceedings of the American Society for Composites Technical Conference
%D2017%I
%JJournal Name: Proceedings of the American Society for Composites Technical Conference
%K
%MOSTI ID: 10060806
%PMedium: X
%TPrediction of Damage Initiation and Simulation of Damage Propagation in 3D Woven Composites during Processing
%XSome configurations of 3D woven composites are known to be susceptible to
processing induced damage in the form of microcracks that develop in the polymer
matrix during curing. The microcracking is believed to originate from high residual
stresses that develop due to a significant mismatch in the coefficients of thermal
expansion between the constituent materials. In this paper, we investigate the
applicability of several commonly used stress-based failure criteria for glassy polymers
– the von Mises, the Bauwens (Drucker-Prager), the parabolic stress, and the dilatational
strain energy density. We study the microcracking phenomenon on the example of the
one-to-one orthogonal configuration of the epoxy matrix/carbon fiber 3D woven
composites. This configuration is characterized by the high level of the throughthickness
reinforcement which appears to exacerbate the matrix damage.
The investigation is based on a high-fidelity mesoscale finite element model of an
orthogonally reinforced 3D woven composite. We simulate the material’s response to
the uniform temperature drop from the curing to room temperature and compare the
results of the simulation with the X-ray computed microtomography. We conclude that
the curing induced matrix failure is well predicted by the parabolic stress criterion with
a proper choice of the material constants. Initiation and propagation of this failure are
simulated via sequential deactivation of the elements exceeding the allowable
equivalent stress.
%0Journal Article