Puck의 파손기준에 기반한 풍력발전기용 복합재 블레이드의 점진적 파손 평가

Abstract

Composites combined physically with a reinforcing material and base material are very different from existing metal materials and show complex damage and damage patterns. To explain this, the Tsai-Hill and Tsai-Wu failure condition equations were introduced using the correlation between the vertical and shear stress and strength, and Puck’s theory was introduced to explain the damage and failure mode under a combined load. In this paper, progressive failure analysis was performed to examine the damage mode of the composite blade for a wind turbine designed and manufactured as a fiber-reinforced composite material and the change in the failure mode due to the increase in load using the theory of Puck’s. For this purpose, 30 kW composite blades were stacked using newly developed low-cost and high-strength pitch-based carbon fibers, and the load was acquired using a simple load calculation method according to the IEC61400-2 standard. A structural safety evaluation was performed through structural analysis under the calculated load. In addition, the damage mode was evaluated using the damage standard theory of Puck’s, and progressive damage analysis was performed in the initial damage progressing gradually with a 10% and 20% increase in the load condition.