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저속 충격을 받는 복합 재료 적층판의 층간 분리 성장에 관한 연구
장창두(CHANG-DOO JANG),송하철(HA-CHEOL SONG),김호경(HO-KYUNG KIM),허기선(KI-SUN HUR),정종진(JONG-JIN JEONG) 한국해양공학회 2002 韓國海洋工學會誌 Vol.16 No.6
Delamination means that cracking occurs on the interface layer between composite laminates. In this paper, to predict the delamination growth in composite laminates subjected to low-velocity impact, the unit load method was introduced, and an eighteen-node 3-D finite element analysis, based on assumed strain mixed formulation, was conducted. Strain energy release rate, necessary to determine the delamination growth, was calculated by using the virtual crack closure technique. The unit load method saves the computation time more than the re-meshing method. The virtual crack closure technique enables the strain energy release rate to be easily calculated, because information of the singular stress field near the crack tip is not required. Hence, the delamination growth in composite laminates that are subjected to low-velocity impact can be efficiently predicted using the above-mentioned methods.