复合材料胶接修补航空铝合金的疲劳性能与损伤监测试验研究-中国测试.PDF

第43卷第4期 中国测试 Vol.43 No.4 2017年4月 CHINA MEASUREMENT TEST April，2017 doi院10.11857/j.issn.1674-5124.2017.04.027 复合材料胶接修补航空铝合金的疲劳性能与 损伤监测实验研究 刘丽娜 渊南京航空航天大学金城学院袁江苏 南京 211156冤 摘 要院针对航空铝合金在疲劳载荷作用下易发生疲劳裂纹快速扩展引起突发断裂破坏的问题袁采用碳纤维复合材 料来胶接修补受损航空铝合金袁以提高其疲劳性能遥 同时袁使用红外热成像技术结合数字图像处理袁对复合材料与铝 合金界面脱粘进行在线监测袁尝试建立脱粘缺陷发展与疲劳裂纹扩展之间的关系遥 进行无修补和有修补受损铝合金 试件的疲劳实验对比研究袁结果表明院复合材料胶接修补铝合金试件的疲劳寿命比未修补试件提高60%袁从实验曲线 走势和破坏形态看袁可认为复合材料的疲劳性能优于复合材料/铝合金界面的疲劳性能袁而界面的疲劳性能优于铝合 金的疲劳性能袁脱粘缺陷的像素增加与金属的裂纹长度延伸规律一致尧高度相关袁可以为后续疲劳裂纹扩展监测提供 参考遥 关键词院铝合金曰复合材料胶接修补曰疲劳性能曰红外热成像监测曰图像分析 文献标志码院A 文章编号院1674-5124渊2017冤04-0130-05 Experimental study on fatigue performance and damage monitoring for aeronautical aluminum alloy adhesively repaired by composite LIU Li爷na 渊Jincheng College袁Nanjing University of Aeronautics and Astronautics袁Nanjing 211156袁China冤 Abstract: To address fast growth of fatigue crack and sudden burst fracture of aeronautical aluminum alloy under fatigue loads袁 this study proposed to use carbon fiber reinforced composite materials to repair damaged aluminum alloy to improve its fatigue performance. At the same time袁 infrared thermal imaging technology with digital image processing was employed to online monitor the interfacial debonding袁 and tried to establish the correlation of the fatigue crack growth and the interfacial debonding. The research on fatigue experiment contrasted with un-repair and repair damaged aluminum alloy specimen. The results show that the fatigue life of the specimen adhesively repaired by composite is 60% longer than that of the un-repaired sp