连续碳纤维增强热固性预浸料压实性能的试验研究

Experimental study on compacting performance of continuous carbon fiber reinforced thermosetting prepreg

预浸料的压实性能是影响复合材料制件成型质量的一项重要指标,为了能够深入了解预浸料在成型过程中的压实性能,本文建立了有效且稳定的试验方案,试验研究了连续碳纤维/环氧预浸料的压实行为,使用万能试验机及自行设计的装置,对预浸料在压实过程中的应力、应变进行了测试和表征,并对尺寸、厚度、温度、下压速率等四个结构和工艺参数进行了控制,以此来探究这些因素对压实行为的影响。结果表明,尺寸、厚度、温度均对应力-应变结果有显著影响,而下压速率影响不大。同时,使用应力硬化模型对试验结果进行拟合,结果表明在预浸料树脂未固化时应力与应变之间存在着指数关系。

The compaction performance of the prepreg is an important indicator that affects the formation of composite materials.In order to understand the compaction performance of pre-immersion in the formation process,this paper establishes effective and stable test programs.The stress and strain of continuous carbon fiber/epoxy prepreg is carried out,using universal testing machine and self-designing device,test and characterize the prepreg in the compaction process.Four structures and process parameters such as size,thickness,temperature and rate of descent are controlled to explore the impact of these factors against compaction.The results show that size,thickness,temperature have a significant effect on stress strain results,and the rate of descent has little effect.At the same time,the test results are fitted with the stress hardening model,and the results show that there is an index relationship between stress and strain at the time of prepreg resin.