Environmental Engineering Reference
In-Depth Information
Fig. 9.23 The photograph of
configuration of the
experiment setup
connected with a load transducer was attached at the free end. This actuator was
capable of exerting a force about 1000kN, with a maximum displacement of
twenty centimeters. The actuator was operated manually, and the force can be read
by the load transducer. Figure
9.23
shows the photograph of configuration of the
experiment setup.
A total of eight piezoelectric transformers were used in this test to detect the
damage propagation. Another eight optical fiber sensors were used to measure the
strain through the blade. All sensors were applied to the blade with epoxy glue.
Sensors arrangement is shown in Fig.
9.24
.
The test consisted of two steps. The first part of this test was an incremented
loading procedure from 0 to 433 N, with steps of 33 N. The actuator was a
mechanical floor jack, hand operated, and the loading steps were determined by
the force sensor reading. After 13 steps, at a load of 433 N, the blade held the load
without failing. This first loading process validated the testing procedure, and the
functionality of each sensor was also confirmed at this time. The load was grad-
ually removed and the blade returned to its neutral position. The second part of the
Fig. 9.24 Location of all
sensors on the blade
