Mixed Mode Evaluation of Different Grinding Depths in FRPC Repairs

TL;DRAbstract

Variations in repair parameters and techniques have a significant influence on the mechanical properties of repaired fiberglass reinforced composite materials. A common method to repair damaged fiberglass wind turbine blades is to conduct hand layup repairs after grinding out the damaged portion. In one sided repair, the ply to which the damage extends depth wise is usually ground off completely and repairs are conducted on the top surface of the next ply. The scope of this work was to observe the effect on repair fracture toughness values when repairs are conducted with this top ply ground off partially. Mixed mode I–mode II testing was carried out on repaired fiberglass composite materials to determine the crack initiation fracture toughness values of two kinds of repairs; one with the top ply intact and other with the top ply partially ground off. The results from this testing were compared to those obtained from mode I testing conducted on similar repairs.

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