摘要
采用T800级碳纤维/环氧树脂单向带铺丝预浸料,使用自动铺丝工艺制备不同厚度的试验层板,探究固化压力、层板厚度及尺寸、自动铺丝压紧力等各项参数对孔隙率及孔隙分布的影响,采用超声C扫描表征复合材料层板孔隙率区间。研究表明,当固化压力降至某临界点后,孔隙率呈现先快速增加又逐渐减慢增加的趋势;厚铺层的层板的孔隙率高于较薄铺层的层板,靠近中间及底部铺层位置的孔隙较多;尺寸较大的层板,高孔隙率的区域相对集中分布在靠近层板中间的位置,且孔隙率区间较大;固化压力较小时,采用小压紧力铺丝的层板会形成更高的孔隙率;对于大型复杂的复材结构件来说,不同的铺丝工艺参数对孔隙率的影响也具有上述趋势。
Using T800 grade carbon fiber/epoxy resin unidirectional tape automatic laying prepreg,test laminates with different thinkness were manufactured by automatic fiber placement process.The effects of curing pressure,laminate thinkness and size,automatic fiber placement pressure and other parameters on porosity and porosity distribution were investigated.Composites porosity intervals were characterized using ultrasonic C-scan.The results show that when the curing pressure drops to a certain critical point,the porosity increases rapidly first and then slows down gradually;Thicker laminates have higher porosity than thinner laminates,and there are more pores near the middle and bottom of the ply;For laminaters with a larger size,the areas with high porosity are relatively concentrated near the middle of the laminates,and the porosity interval is large;When the curing pressure is low,the laminates laid with a small laying pressures will form a higher porosity;For large and complex composites structures,the influence of different automatic fiber placement parameters on porosity also has the above trend.
作者
刘钧天
陈萍
闫超
肖鹏
LIU Juntian;CHEN Ping;YAN Chao;XIAO Peng(COMAC Shanghai Aircraft Manufacturing Co.,Ltd.,Shanghai 200436,China)
出处
《航空制造技术》
CSCD
北大核心
2023年第3期114-118,124,共6页
Aeronautical Manufacturing Technology
基金
工信部民机专项基金项目(F-SFKT-0145)。
关键词
复合材料
孔隙率
固化压力
自动铺丝
超声检测
Composite materials
Porosity
Curing pressure
Automatic fiber placement
Ultrasonic inspection
