碳纤维/环氧树脂复合材料层压板冲击凹坑的回弹特性  

Impact dent relaxation characteristic of carbon fiber/epoxy resin composite laminate

作　　者：管清宇[1,2] 严文军 吴光辉 夏品奇 GUAN Qingyu;YAN Wenjun;WU Guanghui;XIA Pinqi(College of Aerospace Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;Composite Center,Shanghai Aircraft Design and Research Institute,Commercial Aircraft Corporation of China LTD,Shanghai 201210,China;Structure and Stress Technology Department,Shanghai Aircraft Design and Research Institute,Commercial Aircraft Corporation of China LTD,Shanghai 201210,China;Commercial Aircraft Corporation of China LTD,Shanghai 201210,China)

机构地区：[1]南京航空航天大学航空学院,南京210016 [2]中国商用飞机有限责任公司上海飞机设计研究院复合材料中心,上海201210 [3]中国商用飞机有限责任公司上海飞机设计研究院结构强度技术研究所,上海201210 [4]中国商用飞机有限责任公司,上海201210

出　　处：《复合材料学报》2020年第2期284-292,共9页Acta Materiae Compositae Sinica

摘　　要：冲击凹坑的回弹特性对飞机复合材料结构低速冲击损伤的目视检出概率有至关重要的影响。采用T800碳纤维/M21环氧树脂复合材料单向预浸丝束自动铺贴和热压罐固化工艺制造了层压板试件。试件引入1 mm左右的冲击凹坑后分成4组,分别在室温环境、湿热环境、重复载荷及湿热和重复载荷联合作用的条件下测量冲击凹坑在不同时间的回弹量,以研究湿热环境和重复载荷对冲击凹坑回弹的影响。结果表明:湿热环境可显著提高冲击凹坑的末期回弹量,但其影响过程较缓慢,因而对凹坑初始回弹速率影响不显著;重复载荷也可提高冲击凹坑末期回弹量,但其影响相对较小,其使冲击凹坑的初始回弹速率有明显提高;湿热环境和重复载荷联合作用对冲击凹坑末期回弹量的影响高于重复载荷和湿热环境的单独影响,凹坑初始回弹速率与重复载荷单独影响下几乎相同。The impact dent relaxation characteristic has a crucial effect on probability of visual detection of low-velocity impact damage of aircraft composite structure. Laminate specimens were fabricated using T800 carbon fiber/M21 epoxy resin unidirectional prepreg tow auto-fiber-placing and autoclave curing process. The impact dent of about 1 mm was introduced on specimens, which were subsequently divided into 4 groups. The dent relaxation magnitudes in different periods were measured in room temperature ambient condition, elevated temperature wet condition respectively, cyclic loading condition and cyclic loading in elevated temperature wet condition, to study the effect of hygrothermal environment and cyclic loading on the impact dent relaxation. The results indicate: Hygrothermal environment obviously elevates the final relaxation magnitude of impact dent, yet the effect process is slow, therefore initial relaxation speed is nearly unaffected. Cyclic loading also elevates the final relaxation magnitude of impact dent, the effect of which is relatively insignificant. But it obviously elevates the initial relaxation speed. The effect on impact dent final relaxation magnitude of combination of hygrothermal environment and cyclic loading is larger than either of both, and the initial relaxation speed is almost the same as that in cyclic loading condition.

关 键 词：碳纤维/环氧树脂 复合材料 冲击凹坑 回弹特性 湿热环境 重复载荷 

分 类 号：TB332[一般工业技术—材料科学与工程]