【作者】 周竞择； 关志东； 欧阳天； 黎增山； 孙伟；

【Author】 Zhou Jingze;Guan Zhidong;Ouyang Tian;Li Zhengshan;Sun Wei;Beihang Universityi;Unmanned Aerial Vehicle Technology Institute, the Third Academy of CASIC;

【机构】 北京航空航天大学； 航天科工三院无人机技术研究所；

【摘要】 本文研究了阶梯式挖补修理对含低速冲击损伤复合材料加筋板轴向压缩行为的影响。针对T型四筋条加筋板,利用落锤法在面板中心引入低速冲击损伤后进行挖补修理。对不修理(C)、挖补修理(W)两组试验件进行轴向压缩试验,试验结果显示:相比于不修理组,挖补修理组试验件的屈曲载荷提高57%,失效载荷提高39%。对挖补修理加筋板进行压-压疲劳试验(修理后疲劳WP组),最大压缩载荷取40%挖补修理组(W)失效载荷、应力比R取10、循环次数为10?次。对疲劳试验后的试验件进行轴向压缩试验,结果显示:相比于挖补修理组(W),疲劳试验后试验件屈曲载荷和结构刚度基本不变,失效载荷下降4%。通过W、WP两组试验件失效模式可以看出挖补修理后试验件最终失效发生在补片与面板胶接处,反映胶接质量影响挖补修理的效果。以上结果表明挖补修理对含损伤复合材料加筋板的修理效果良好,压-压疲劳试验对挖补修理效果无显著影响。更多还原

【Abstract】 The purpose of this paper was to investigate the stepped scarf repair and its effect on stiffened composite panels after low-velocity impact. For T-stiffened composite panels stiffened by four stringers, lowvelocity impact was conducted on the center of the panel with a drop hammer and then the specimens were repaired. Axial compression tests were performed on unrepaired(group C) and repaired(group W) specimens. The experiments results reveal that, the buckling load and the failure load of group W ware improved by 457% and 39% respectively compared to group C. Fatigue experiments were also carried out on repaired specimens(group WP). The maximum compressive load was set as 40% failure load of group W with the stress ratio of 10, the fatigue cycle was 10?. Compression tests were performed on group WP. The results show that fatigue load had no obvious influence on the buckling load and stiffness of the specimens, while the failure load had decreased by 4% compared to group W. The failure modes of group W and WP show that the final failure occurred in the adhesive region between repair plies and the panel, which means the quality of adhesive bonding had a significant influence on scarf patch repair. Based on the results, the scarf patch repair is proved to be efficient for stiffened composite panels after low-velocity impact, and the cyclic compressive fatigue load had no obvious influence on repaired stiffened composite panels.更多还原