Fourteen samples were subjected to the static bending
test. The fracture load was between 109 and 142 mN, with
an average value of 123 mN. Fig. 8 shows the resulting
displacements for the load levels at 0.86. These resultsshow a very small increase of both resultant and permanent
displacement with the number of cycles. This suggests
that it is difficult to estimate a fracture cycle by
examining resultant displacement during tests. The relation
between the resultant displacement and fatigue cycle
for some samples is shown in Fig. 9. The increase of the
resultant displacement was small. Fig. 10 shows the relation
of static fracture strain and fatigue resultant strain.
The fatigue fracture stress and strain were normalized to
the static fracture values. As load level decreased, the
resultant fracture strain decreased. For composite materials
and sandwich structures, it is reported that the resultant
fracture strain is proportional to the load level [11].
However the nanohoneycomb structure showed different
behaviorThe fatigue test results are summarized in Table 1, and
fatigue life data and prediction curves for the mean values
of the fatigue cycle are shown in Fig. 11. The results using
the arithmetic mean value for the fatigue cycle are as follows
[11]:formed in the clogged layer propagate towards the hole
and across the width, which resulted in clear rectangular
fractured shapes