SAMPE Journal - May/June 2021 - 13
Table 2. Measured displacement at 5.5m from the root.
Displacement at Load
Application (5.5m from root)
Load Case 1
Load Case 2
Load Case 3
Load Case 4
119.4 mm
162.8 mm
235.0 mm
240.9 mm
Similarly, the width of the A3 sheet was measured
and used to convert the vertical distance between
the laser and the reference line into the real vertical
distance. Doing so, and using trigonometry, the
angle of rotation of the frame was measured as a
function of the root bending moment. The frame
rotation was linear to the applied moment, and it
was found that the angular stiffness was equal to
5.94 x 10-5 rad/kNm.
The corrected deflections were calculated at 5.5m
from the root using both the data from the Qualisys
markers as well as the string potentiometers. The
displacement measurements, summarized in
Table 2, were very consistent between the three
runs of each load case and showed no perceptible
difference between the initial Load Case 4 and the
final repeat run. All the test runs showed a maximum
displacement well under the maximum 0.4m
allowed tip displacement, even when extrapolating
the measured value of 5.5m to the tip displacement
of the blade at 6.0m from the root.
w w w. s a m p e . o r g
May June 2021 Journal.indd 13
Test Observations
Throughout the test program, no damage in the
form of noise, cracks, delaminations, localised
buckling of the torsion box or permanent
deflections were observed for any of the load cases.
No damage in any form was detected by either the
strain gauges or the DIC cameras, which would
have been identified by higher strain values for the
repeat run of Load Case 4 in the event of damage.
Additionally, maximum blade displacement as
measured by Qualisys cameras and the string
potentiometers show that the blade stiffness was
the same at the start and end of the test program.
Therefore, although it is not possible to state that
no damage occurred in the torsion box, it can be
said that no damage detrimental to the blade
structural properties was observed or measured
throughout this test.
M AY/J U N E 2 0 2 1
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SAMPE JOURNAL
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4/8/2021 12:32:25 PM
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SAMPE Journal - May/June 2021
Table of Contents for the Digital Edition of SAMPE Journal - May/June 2021
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SAMPE Journal - May/June 2021 - Cover1
SAMPE Journal - May/June 2021 - Cover2
SAMPE Journal - May/June 2021 - Table of Contents
SAMPE Journal - May/June 2021 - 2
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