An. Palazotto et al., Low velocity impact damage characteristics of Z-fiber reinforced sandwich panels - an experimental study, COMP STRUCT, 43(4), 1998, pp. 275-288
Experimental results related to the initiation of damage in Z-fiber truss-r
einforced sandwich panels are presented. Two different orientations of Fin
angles are considered. A pendulum-type impactor is used to impart very low
levels of impact energy. Threshold energy levels at which the observable da
mage initiation occurs are determined. Nondestructive evaluation studies co
nducted prior to the impact are compared with the post-impact status of the
panels for assessing the type and magnitude of the damage. These studies i
nclude ultrasonic inspection, microscopic inspection and acoustic emission
tests. Damage is also evaluated by carrying out vibration tests before and
after impact. Static indentation tests are carried out to compare with low
velocity impact tests. Effects specific to the impact phenomena are studied
by comparing the load displacement characteristics. Compression after impa
ct characteristics are also evaluated. (C) 1999 Elsevier Science Ltd. All r
ights reserved.