7.3 Phase 2 - Definition of model framework
111
Quasi 3D-continuum
(axisymmetric)
3D-continuum
Detailed meso-scale
Start
2D-shell
Definition of level of detail
Selection of time integration
Explicit
Implicit
 In-plane damage
 Symmetry about panel plane
 Out-of-plane damage
 Axisymmetric loading
 Isotropic materials
 In-plane and out-ofplane damage
 Orthotropic materials
 Large core deformation
with multiaxial loading
 Optimization of cellular
cores
 More than two nonlinear effects
 High loading rates
 Up to two non-linear
effects
 Quasi-static loading
Framework
suitable
Preliminary evaluation
no
yes
End
 Convergence
 Compuational effort
Problem analysis
Definition of model
framework
Model development
Application of virtual test
method
1
2
3
4
Figure 82 Flow chart of Phase 2 with illustration of different modelling approaches
Definition of level of detail
The definition of the level of detail corresponds to the four groups of computational
models of sandwich structures which are introduced in section 2.3 (Figure 16, p. 18). The
present work focuses on virtual tests by means of FE-models. Therefore, only the introduced FE-modelling approaches are considered. The given flow chart illustrates the different levels of detail based on standard inserts under pull-out loading as example. If
compared to Figure 16, the quasi 3D-continuum models are here distinguished as separate level of detail. Therefore, the presented virtual testing approach suggests four levels
of detail to choose from in Phase 2. These are described further in the following.
2D-shell and plate models can be used efficiently in applications where symmetric inplane damage mechanisms are dominant. However, the 3D-continuum and detailed
models are generally most suited for advanced non-linear simulations such as required
for virtual tests, since they also enable to adequately represent out-of-plane damage