e-Journal of Non-Destructive Testing 11, 2006
G. Wimmer, C. Schuecker, H.E. Pettermann
Austrian Aeronautics Research (AAR),
Institute of Lightweight Design and Structural Biomechanics,
TU Wien, Vienna, Austria
Delamination in fiber reinforced laminated composite structures is analyzed.
The numerical simulation of delamination is divided into creation of a starting
delamination and delamination growth.
The starting delamination is predicted by a stress based failure criterion
developed by Puck.
Growth of the starting delamination is modeled by the Virtual Crack Closure
A curved laminate is analyzed to demonstrate the proposed simulation procedure.
A linear finite element analysis is performed to predict the starting
delamination, whereas nonlinear analysis are required for the simulation of
The effect of the size of the starting delamination is studied and a critical
size is found.
From the simulations of the growth of various starting delaminations the
maximum bearable load of the structure is predicted.
Moreover, structures containing initial delaminations were analyzed, yielding
conditions for crack growth stability. For the verification of the proposed
simulation procedure, cohesive zone elements are used and the same results are
However, the proposed simulation procedure is computationally markedly cheaper
than the use of cohesive zone elements.