Summary of Test Results
The evaluation focused on the residual mechanical properties of the blades, including tensile and compressive strengths, as well as Young’s modulus in both longitudinal and transverse directions. The laboratory tests confirmed that the DWTBs possess substantial residual strength, as shown in Table 1. For instance, the longitudinal tension strength of 90.1 ksi and compressive strength of 53.85 ksi demonstrate the blades’ capacity to support significant loads.
Table 1. Mechanical Properties of the Spar Cap of GE37 Wind Turbine Blade
|
Mechanical Property |
No of samples |
Strength (σ) |
Modulus (E) |
||
|
Mean |
COV% |
Mean |
COV % |
||
|
Longitudinal tension, ksi |
7 |
90.1 |
6.45 |
5445.9 |
4.95 |
|
Transverse tension, ksi |
10 |
10.15 |
10.1 |
1963.84 |
2.84 |
|
Longitudinal compression, ksi |
5 |
53.85 |
8.38 |
5562.54 |
4.76 |
|
Transverse compression, ksi |
5 |
23.85 |
3.76 |
N. A |
N. A |