온도에 따른 복합재 리프스프링의 충격손상에 대한 실험적 및 해석적 연구

초록

Glass fiber reinforced plastic (GFRP) composite leaf springs have been widely investigated as lightweight alternatives to conventional steel leaf springs to improve fuel efficiency and meet stringent environmental regulations. However, GFRP leaf springs are directly exposed to impact loads from road debris during service, which can cause severe internal damage such as delamination and debonding. Therefore, quantitative evaluation of impact damage and the establishment of damage-tolerance criteria are essential. In this study, impact tests considering temperature variations were conducted to determine the impact-damage tolerance of GFRP composite leaf springs. The impact tests conducted at room temperature under impact energies of 80, 100, and 120 J showed that 120 J satisfied the visible impact damage criterion as the reference impact energy. This energy was applied to both low-and high-temperature tests, resulting in a 31.9% increase in the maximum load at low temperature compared with room temperature. The experimental results were further validated using explicit finite element analysis with LS-DYNA, showing similar impact behavior with less than 2% error in the maximum load.

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