6 Mechanical characterization on sub-component
level
The sub-component level is typically concerned with all joints and fasteners within sandwich constructions. In the framework of the present thesis various configurations of
common sandwich fastener designs were investigated in experimental studies. These
experimental studies serve as reference for the development and validation of a virtual
testing approach, which is described in chapter 7. The performed experimental studies
are described in the following. They are clustered according to the studied type of fastener or joint.
6.1 Threaded inserts perpendicular to the face sheet
As established in section 2.2.1, out-of-plane tension/compression and in-plane shear are
the most important loading conditions for threaded inserts placed perpendicular to the
face sheets. This is also evident in the fact that most available studies focus on these load
cases. Song et al. [Son08] studied various configurations of potted inserts in Nomex honeycomb sandwich panels with carbon epoxy face sheets. They reported that the pull-out
strength strongly correlates with core density and height as well as the face sheet thickness. The shear-out joint strength on the other hand is dominated by the face thickness.
Kim and Lee [Kim08] investigated the effect of the insert geometry on the load introduction of partially potted inserts in composite sandwich panels. Demelio et al. [Dem01]
looked at various combinations of honeycomb sandwich panel fasteners under pull-out
and shear static and fatigue loading. They pointed out that core height and skin reinforcements have the most significant impact on the fatigue strength. Bianchi et al.
[Bia11], compared hot and cold bonded procedures of honeycomb sandwich insert manufacturing. They reported that the stiffness of the potting material strongly correlates
with the insert pull-out strength. Heimbs and Pein [Hei09] investigated the failure behavior of sandwich inserts under pull-out and shear, pointing out the different damage
mechanisms. In the present work both, pull-out and shear tests are considered. In the
© Springer-Verlag GmbH Germany, part of Springer Nature 2020
R. Seemann, A Virtual Testing Approach for Honeycomb Sandwich Panel
Joints in Aircraft Interior, Produktentwicklung und Konstruktionstechnik 16,
https://doi.org/10.1007/978-3-662-60276-8_6
level
The sub-component level is typically concerned with all joints and fasteners within sandwich constructions. In the framework of the present thesis various configurations of
common sandwich fastener designs were investigated in experimental studies. These
experimental studies serve as reference for the development and validation of a virtual
testing approach, which is described in chapter 7. The performed experimental studies
are described in the following. They are clustered according to the studied type of fastener or joint.
6.1 Threaded inserts perpendicular to the face sheet
As established in section 2.2.1, out-of-plane tension/compression and in-plane shear are
the most important loading conditions for threaded inserts placed perpendicular to the
face sheets. This is also evident in the fact that most available studies focus on these load
cases. Song et al. [Son08] studied various configurations of potted inserts in Nomex honeycomb sandwich panels with carbon epoxy face sheets. They reported that the pull-out
strength strongly correlates with core density and height as well as the face sheet thickness. The shear-out joint strength on the other hand is dominated by the face thickness.
Kim and Lee [Kim08] investigated the effect of the insert geometry on the load introduction of partially potted inserts in composite sandwich panels. Demelio et al. [Dem01]
looked at various combinations of honeycomb sandwich panel fasteners under pull-out
and shear static and fatigue loading. They pointed out that core height and skin reinforcements have the most significant impact on the fatigue strength. Bianchi et al.
[Bia11], compared hot and cold bonded procedures of honeycomb sandwich insert manufacturing. They reported that the stiffness of the potting material strongly correlates
with the insert pull-out strength. Heimbs and Pein [Hei09] investigated the failure behavior of sandwich inserts under pull-out and shear, pointing out the different damage
mechanisms. In the present work both, pull-out and shear tests are considered. In the
© Springer-Verlag GmbH Germany, part of Springer Nature 2020
R. Seemann, A Virtual Testing Approach for Honeycomb Sandwich Panel
Joints in Aircraft Interior, Produktentwicklung und Konstruktionstechnik 16,
https://doi.org/10.1007/978-3-662-60276-8_6