摘要
针对复合材料热压工艺建立了一套可以研究孔隙形成规律的工艺实验模拟装置,采用该装置考查了成型压力、加压点、吸胶方式、试样厚度等因素对孔隙的影响。结果表明,所建立的研究方法可以获取孔隙与工艺因素的关联规律;对于MT300/603碳纤维/环氧预浸料,成型压力的增大与加压点温度的降低都可以降低孔隙率与孔隙尺寸,但压力对于孔隙率的消除效果更明显;孔隙消除机理中的树脂流动带出气泡起主要作用,而压力的压溃和排气作用起次要作用;铺层厚度对孔隙形成有明显影响。研究结果对于热压工艺复合材料孔隙缺陷的控制提供了重要的研究手段和实验依据。
A experimental simulation system for composites in hot pressing process was established for studying void formation evolution. By means of this system, the effects of molding pressure, pressure applying moment, bleeding mode and sample thickness on void were investigated. The results indicate that the simulation system can be used to obtain the relationship between void and processing factors. For MT300/603 carbon fiber/epoxy prepreg, increasing molding pressure and decreasing pressure applying temperature can reduce porosity and void size, and the molding pressure is more obvious for eliminating void. Moreover, resin flow plays an important role in void elim- ination mechanism rather than pressure squashing and venting effects. Thickness of prepreg stack has significant effect on void formation. These results provide important studying method and experimental evidences for void defect control in composites for hot pressing process.
出处
《玻璃钢／复合材料》
CAS
CSCD
北大核心
2014年第5期51-55,共5页
Fiber Reinforced Plastics/Composites
关键词
复合材料
热压工艺
预浸料
孔隙
composites
hot pressing process
prepreg
void
