热压罐零吸胶工艺树脂压力在线测试及其变化规律

Resin pressure online measuring and evolution during autoclave zero-bleeding process

针对碳纤维缎纹布/环氧914预浸料热压罐零吸胶工艺,采用热压成型过程树脂压力在线测试系统监测树脂压力的大小与分布,分析了真空、外加气压对树脂压力的作用规律,通过显微观察研究了真空及外加气压对孔隙缺陷的影响。实验结果表明,所采用的在线测试系统可以定量分析真空在铺层内的作用程度和树脂压力的变化;零吸胶工艺树脂承担了大部分外压且沿层板厚度及面内方向分布均匀;真空通过铺层内的气路通道排出夹杂空气,其作用程度受到树脂黏流状态和铺层密实程度的影响;不同压力条件下复合材料层板孔隙状况与树脂压力的测试结果相吻合。

For the carbon fiber satin fabric/epoxy 914 prepreg, a resin pressure online measuring system for hot pressing process was used to measure the value and distribution of resin pressure. Additionally, the effects of vacuum and autoclave pressure on resin pressure were studied. Moreover, the influence of vacuum and autoclave pressure on void formation was investigated using micrographs. The experimental results show that the online measuring system applied can quantitatively analyze the influence of vacuum in plies and resin pressure evolution. The resin bears most of autoclave pressure and distributes uniformly in thickness and inplane directions during autoclave zero-bleeding process. Vacuum can exhaust entrapped air through gas channels in prepreg stacks, and the effect depends on resin rheological property and compaction of prepreg stacks. In addition, the results of void analysis are consistent with the measurements of resin pressure under different pressure conditions.