This study experimentally and numerically characterizes the high-velocity impact damage in CFRP laminates to clarify the damage extension mechanisms. To this end, we focus on impact damage near perforation. High-velocity impact tests were conducted for two types of cross-ply laminates. At a relatively low velocity less than 200 m/s, a crater with fiber breaks, oblique matrix cracks, and delamination were observed just beneath the impact point. Delamination had a fan shape, which was similar to that observed in low-velocity impact tests. Catastrophic ply-failure zone, which included extensive fiber breaks, matrix cracking, matrix crushing, and delamination, appeared in the middle of the laminate at an impact velocity over 300 m/s. The extension of high-velocity impact damage in composite laminate was then predicted by smoothed particle hydrodynamics (SPH). A crater was formed by matrix failure and fiber breaks generated in the top 0° ply near the impact point. Ply interfaces were then delaminated, and a matrix cracking and crushing zone appeared in the middle plies. This damage pattern, including the delamination shape, agreed with the observation. Delamination mainly extended at a ply-interface along the matrix crack in the lower ply regardless of the stacking sequence. Based on the experiments and the analyses, the mechanisms of high-velocity impact damage in CFRP laminates will be discussed.
|出版ステータス||出版済み - 1 1 2015|
|イベント||20th International Conference on Composite Materials, ICCM 2015 - Copenhagen, デンマーク|
継続期間: 7 19 2015 → 7 24 2015
|会議||20th International Conference on Composite Materials, ICCM 2015|
|Period||7/19/15 → 7/24/15|
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