2.5 Assessment of the state of the art and need for further research
31
linked to failure modelling of sandwich panel joints. On the left of the graph, there is a
cluster with authors, who solely model joints on sub-component level without covering
multiple hierarchy levels. These models are limited in their capability to predict the failure of the joints. Only the detailed models of Roy et al. [Roy14] and Silmane et al. [Sli17]
enable the prediction of damage initiation. The two virtual testing studies of Heimbs and
Zinno stand out, since they cover all four hierarchy levels. To less extend this also applies
to Bunyawanichakul et al. [Bun08], whose studies come closest to the scope of the present work. However, their 3D-continuum model was not able to capture the progressive
damage of inserts and the preceding hierarchy levels were not investigated thoroughly.
In the bottom right of the graph, there is a cluster of authors, who established detailed
models of cellular sandwich cores and successfully implemented them into bonded sandwich panel models. These models have the highest computational level in the reviewed
literature. However, they do not go beyond the bonded panel level. There is no computational model for sandwich panel joints that is able to predict progressive damage up
until failure.
Preliminary
design
Failure
prediction
Damage
initiation
Contstituent
Structural
element
Subcomponent
Component
Hierarchy levels /
scope
Computational
level
Bunyawanichakul
Castanie
Giglio/Manes/Gilioli
Thomsen
Bianchi
Silmane
Roy
Zinno
Present thesis
Kilchert/Fischer
Smith
Heimbs
Tsouvalis
Figure 26 Overview and classification of computational models for detailed analysis of sandwich
structures with focus on sandwich panel joints
Sandwich panel joint design
Once implemented, virtual tests enable quick and inexpensive design studies. In this context, many of the reviewed models were implemented for parameter and sizing studies
[Tso06], [Rag08], [Bul08] or strength variation studies [Rag08], [Sli17] on existing joint
designs. While the models of these studies contribute to a better understanding of the
31
linked to failure modelling of sandwich panel joints. On the left of the graph, there is a
cluster with authors, who solely model joints on sub-component level without covering
multiple hierarchy levels. These models are limited in their capability to predict the failure of the joints. Only the detailed models of Roy et al. [Roy14] and Silmane et al. [Sli17]
enable the prediction of damage initiation. The two virtual testing studies of Heimbs and
Zinno stand out, since they cover all four hierarchy levels. To less extend this also applies
to Bunyawanichakul et al. [Bun08], whose studies come closest to the scope of the present work. However, their 3D-continuum model was not able to capture the progressive
damage of inserts and the preceding hierarchy levels were not investigated thoroughly.
In the bottom right of the graph, there is a cluster of authors, who established detailed
models of cellular sandwich cores and successfully implemented them into bonded sandwich panel models. These models have the highest computational level in the reviewed
literature. However, they do not go beyond the bonded panel level. There is no computational model for sandwich panel joints that is able to predict progressive damage up
until failure.
Preliminary
design
Failure
prediction
Damage
initiation
Contstituent
Structural
element
Subcomponent
Component
Hierarchy levels /
scope
Computational
level
Bunyawanichakul
Castanie
Giglio/Manes/Gilioli
Thomsen
Bianchi
Silmane
Roy
Zinno
Present thesis
Kilchert/Fischer
Smith
Heimbs
Tsouvalis
Figure 26 Overview and classification of computational models for detailed analysis of sandwich
structures with focus on sandwich panel joints
Sandwich panel joint design
Once implemented, virtual tests enable quick and inexpensive design studies. In this context, many of the reviewed models were implemented for parameter and sizing studies
[Tso06], [Rag08], [Bul08] or strength variation studies [Rag08], [Sli17] on existing joint
designs. While the models of these studies contribute to a better understanding of the