194
Appendix B – Structural element level
B2 Comparison of modelling approaches in case of bending
The bending tests are virtually implemented using two different modelling approaches
for the core. The following table compares the two approaches in terms of the visual
failure mode for the three dominating kinds of failure. Both models enable to reproduce
the correct failure mode. Furthermore, in case of local indentation and face sheet failure,
the two approaches lead to comparable visual failure patterns. The limitations of the 3Dcontinuum core are most evident in case of core shear. The 8-node hexahedron elements
are not capable to capture the distributed shearing of the core. Instead the shearing is
limited to only one row of elements directly underneath the load cylinder. This eventually leads to local compressive core indentation and thus to premature failure.
Detailed core
3D-continuum core
B19-L101
Local core indent.
B07-L001-3P
Face sheet failure
B19-L003
Core shear failure
Appendix B – Structural element level
B2 Comparison of modelling approaches in case of bending
The bending tests are virtually implemented using two different modelling approaches
for the core. The following table compares the two approaches in terms of the visual
failure mode for the three dominating kinds of failure. Both models enable to reproduce
the correct failure mode. Furthermore, in case of local indentation and face sheet failure,
the two approaches lead to comparable visual failure patterns. The limitations of the 3Dcontinuum core are most evident in case of core shear. The 8-node hexahedron elements
are not capable to capture the distributed shearing of the core. Instead the shearing is
limited to only one row of elements directly underneath the load cylinder. This eventually leads to local compressive core indentation and thus to premature failure.
Detailed core
3D-continuum core
B19-L101
Local core indent.
B07-L001-3P
Face sheet failure
B19-L003
Core shear failure