摘要
本文研究了复合材料加筋板的筋条冲击损伤及冲击损伤对加筋板轴向压缩(CAI)行为的影响。针对T型单筋加筋板,通过落锤法从面板一侧对筋条进行5种能量水平的低速冲击。试验结果表明:冲击筋条产生的面板凹坑不易观察;当冲击能量低于筋条损伤门槛能量时,加筋板筋条无损伤出现,筋条-面板也不会发生脱粘;一旦冲击能量超过筋条损伤门槛能量,筋条的腹板会在弯曲拉伸应力作用下损伤,同时筋条-面板之间会出现严重脱粘。分别对完好和损伤试验件进行压缩试验,试验结果显示:低于门槛能量的冲击对加筋板的压缩屈曲载荷影响不大,同时只会略微降低失效载荷;而冲击造成筋条损伤后,筋条在压缩过程中会由于损伤扩展出现卸载;卸载后的筋条会对面板失去支撑,使面板的屈曲载荷降低,从而大幅地削弱加筋板的承载能力。
The purpose of this paper was to investigate the stiffener impact damage and its effect on compression after impact（CAI）behavior of T-stiffened composite panels.For single T-stringer stiffened panels,low-velocity impact was conducted on the stiffener with a drop hammer over the panel at five energy levels.The impact experiments reveal that,the panel dent is almost invisible after stiffener impact.Besides,before the impact energy reaches the threshold value,there is no damage occurring in the stiffener and stiffener-panel is not debonding either.However,once the impact energy exceeds the threshold value,the stiffener will be damaged under bending tensile stress,meanwhile the stiffener-panel will debond severely.Compression tests were performed on intact and damaged specimens.The tests show that,when no damage is induced in the stiffener,the low velocity impact has little effect on buckling behavior of the stiffened panel while the failure load is reduced slightly.However,after the stiffener is damaged by impact,the stiffener will unload due to the damage growth during the compression process.The unloading of stiffener can weaken the support for the panel and thus decreases the panel buckling load,which can dramatically reduce the load carrying capacity of the stiffened panel.
作者
欧阳天
关志东
谭日明
郑达
孙伟
OUYANG Tian;GUAN Zhidong;TAN Riming;ZHENG Da;SUN Wei(School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China;Shenyang Aircraft Design and Research Institute, Shenyang 110035, China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2018年第10期2689-2697,共9页
Acta Materiae Compositae Sinica
关键词
复合材料
加筋板
筋条冲击
门槛能量
脱粘损伤
屈曲
composite
stiffened panel
stiffener impact
threshold energy
debonding damage
buckling
