78
5 Mechanical characterization on structural element level
Figure 60 Experimental results of 4P-bending tests with loading plates and 3P-bending tests
Core shear can be easily identified by slowly progressing shear buckling of the cell walls,
leading to a plateau in the force-displacement curve (e.g. B19-W003). The other two failure modes are more difficult to distinguish, as they succeed one after another almost
instantly. As a result, force-displacement curves as well as visual damages after testing
look similar. However, face sheet failure tends to lead to a more significant load drop if
compared to local indentation. In addition, face sheet failure can be generally identified
by a distinct bang during testing, which is typically not evident with core indentation.
The identified failure modes for each configuration are indicated in and Figure 59 and
Face sheet failure
Core shear
Core indentation
1
2
1
2
5 Mechanical characterization on structural element level
Figure 60 Experimental results of 4P-bending tests with loading plates and 3P-bending tests
Core shear can be easily identified by slowly progressing shear buckling of the cell walls,
leading to a plateau in the force-displacement curve (e.g. B19-W003). The other two failure modes are more difficult to distinguish, as they succeed one after another almost
instantly. As a result, force-displacement curves as well as visual damages after testing
look similar. However, face sheet failure tends to lead to a more significant load drop if
compared to local indentation. In addition, face sheet failure can be generally identified
by a distinct bang during testing, which is typically not evident with core indentation.
The identified failure modes for each configuration are indicated in and Figure 59 and
Face sheet failure
Core shear
Core indentation
1
2
1
2