• Felix Prieto Viejo
  • Jose Mato Sanz
  • Pere Joan Jaume Camps
3. semester, Design af Mekaniske Systemer, Kandidat (Kandidatuddannelse)
Through this report a methodology for the characterization
of cohesive laws for layered composite
materials is developed. The method relies
on substituting the phenomena present at the
delamination interface for an equivalent traction
field acting on a simple beam. The methodology
is based on inverse parameter identification,
optimization techniques and Timoshenko beam
theory. Numerical modelling for the testing of
the methodology is done by beam theory, finite
element method and cohesive zone modelling.
The Double Cantilever Beam interface tractions
are modelled as a Simple Cantilever Beam under
a distributed load. A model based on successively
superposing individual triangular distributed
loads in different locations is created
and then the displacement produced by them is
computed and compared to the deflection from
experimental/simulated data.
Two responses are used to test the model, a simulation
in ANSYS and a real experiment, both
using a Double Cantilever Beam under mode I
delamination. A residual is then defined as a
discrepancy between the proposed model and
the simulated/real experimental data. The inverse
identification of the traction field is done
by the minimization of the residual using the
linear least-squares method.
The motivation for this method is the elimination
of the complexities that the present methods
have, creating a robust technique, simple to apply,
that helps the characterization of cohesive
law shapes faster and with less resource allocation.
Udgivelsesdato19 dec. 2019
Antal sider96
ID: 317703775