Ariel Lusty Mechanical Engineering PhD Comp Exam Presentation
- Tuesday, March 31, 2020 at 3:00pm
- Please join the presentation via WebEx Meeting number (access code): 929 878 468 Meeting password: CompExam_03_31 Join meeting Join by phone Tap to
A Comparison of Surface Preparation Techniques for Wind Turbine Field Repairs
Wind turbines are increasingly being operated for much longer than their planned 20-year design lives. Additionally, the lengths of wind turbine blades are expected to continue to increase considerably for both land-based and offshore applications. These combined trends necessitate reliable and consistent wind blade maintenance procedures. Repairs are designed to return the structure to its original strength, stiffness, shape, and surface finish. Wind blade repairs begin with damage detection and damage assessment, followed by cost analysis, repair design, surface preparation, and finally, patching. Wind turbine blade repair surface preparation involves damaged material removal, surface sanding, and contamination removal. Proper surface preparation procedures are vital to good adhesion between the repair patch and the wind blade, and thus the resultant durability of a repair.
Solvent wiping is a common procedure for contaminant removal after damaged material is removed from a wind turbine blade, but it is unknown if solvent wiping reduces the surface energy and consequently the likelihood of a durable repair. Results from contact angle, lap shear, Double Cantilever Beam, and End-Notch Flexure tests have demonstrated that solvent wiping does not significantly affect contact angles, maximum lap shear, or modes I and II fracture toughness. In addition to unknown effects of solvent wiping, the tolerability of repair patches to contamination is also unknown. To improve repair adhesion properties, plasma and chemical treatments will also be considered. The research proposed will use materials testing, spectroscopy, and finite element analysis to quantify the effectiveness of current wind turbine field repair surface preparation recommendations and inform how repairs can be improved. Improved repair procedures will decrease lifetime costs and increase energy production, ultimately leading to wind becoming a more viable form of renewable energy.
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- Department of Mechanical & Industrial Engineering