Sample Tests
- The DWTB material sample tests were conducted using MTS testing machine equipped with 69-MPa hydraulic grips. Specimens were secured using serrated grip wedges to prevent slippage and minimize superficial damage, eliminating the need for tabbing.
- Texas Measurements strain gauges (FLAB-5-11-5LJCT-F) with a resistance of 120 Ω were used for strain measurements. M-Bond 200 adhesive along with M-Bond 200 catalyst for quick setting is used as the adhesive for strain gauges.
- Data acquisition was managed by a HBM equipped with QuantumX-MX1615B strain gauge amplifiers capable of recording 32 strain gauges, running HBM CatmanEasy for simultaneous strain and load data collection, and integrated MTS systems for specimens without strain gauges.
- The cross sections of the blade feature three primary components: the shell (which defines the airfoil shape), the spar cap (the main load-bearing element), and the webs (which provide shear and buckling support).
- Given the load dynamics on the wind blade, the spar cap is expected to experience the highest levels of fatigue and degradation in strength and stiffness, making it a priority for initial property testing
Cross-section of GE37 DWTB at tip
Material sample from spar cap of GE37 DWTB at mid-section
Cross-section of sample from GE37 blade
Specimen coupon preparation for testing