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Title: Finite difference simulations of closed delaminations in composite materials
Authors: Delrue, Steven
Van Den Abeele, Koen #
Issue Date: Jul-2010
Conference: International Conference on Nonlinear Elasticity in Materials edition:15 location:Otranto date:4-11 July 2010
Abstract: Early stage delaminations in composites tend to be closed at rest. Inspection with traditional linear ultrasonic techniques generally fails to diagnose and locate such imperfections. However, if undetected and left untreated, such incipient defects may gradually grow within the material and eventually lead to the failure of the component. Kissing bonds or clapping contacts inherently demand a nonlinear diagnostic method, applying a finite excitation amplitude that is able to overcome an activation threshold to open and close the contact.
In order to obtain a better understanding and analysis of the macroscopic nonlinear behavior that can be observed at the component level, we developed and investigated the results of a finite difference model for a composite material containing a single delamination, parallel to the surface. The model makes use of local node splitting and the nonlinear constitutive behavior is implemented in the form of discontinuous boundary conditions. The results of this parametric study allow a better insight in the behavior of the excited delamination in experimental conditions, including the appearance of subharmonics and localised delamination modes. Using the numerical simulations, we have shown that the depth of the delamination interface has a large influence on the dynamic response of the defect zone. Also, the influence of the excitation amplitude can be illustrated by varying different parameters.
Publication status: accepted
KU Leuven publication type: IMa
Appears in Collections:Physics, Campus Kulak Kortrijk
Interdisciplinary Research Facility Life Sciences, Campus Kulak Kortrijk
# (joint) last author

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